The document outlines a training module on extended wet detention basins and extended detention wetlands, including an agenda that covers an overview and definitions, design examples, a design activity, and considerations for implementation, operations and maintenance, vegetation, and lessons learned. The training is sponsored by MARC and presented by engineers from CDM to review best practices for these stormwater management techniques.
This document summarizes a study on stormwater impacts to McVicar Creek. The study aimed to: identify impacts; characterize them through a stream assessment; identify 3 representative sites; pursue further research; and develop remediation recommendations. The initial assessment identified 3 sites - Court Street, Castlegreen, and County Fair - for further study. Additional data collection and stakeholder workshops were held. The workshops developed stormwater management objectives and site-specific recommendations. For Court Street, increased enforcement and education were recommended. For Castlegreen, investigating infrastructure and partnering with local groups. For County Fair, educating landowners and considering end-of-pipe solutions were recommended. The final recommendations emphasized objectives and further stakeholder
Low impact development (LID) techniques aim to manage stormwater close to its source through practices like bioretention and permeable pavements. The presentation discusses LID manuals and projects in Jacksonville including recreational LID demonstrations at parks and a Valens Drive retrofit. Hydrologic modeling shows LID increases local water tables and runoff capture. Potential benefits include reduced flooding, better water quality and lower infrastructure costs. The City plans to monitor the Valens Drive project and expand LID coverage.
Contractor Awareness Training Below Ground Facilities 2016Fairfax County
This document provides an overview of a stormwater maintenance awareness training held by the Department of Public Works and Environmental Services in Fairfax County, VA. The training covered the history of stormwater regulations, types of stormwater management facilities like underground detention, sand filters, and manufactured BMPs. It discussed common maintenance issues for these facilities like debris and sediment accumulation, damage to components, and remedial actions required. The document included pictures of different facility components and deficiencies to illustrate key points.
Kevin Vought Select Samples of Water Resource CapabilityKevin Vought, P.E.
Kevin Vought has 15 years of experience conducting various groundwater, surface water, and coastal modeling projects. He presented on his work using modeling tools like MODFLOW, MT3DMS, SEAWAT, MIKE SHE, and ADCIRC to assess groundwater availability, contaminant transport, surface water-groundwater interaction, and coastal hydrodynamics. Some key projects included developing integrated models for the Broward County IWRMMP and modeling circulation patterns for alternatives to restore the shoreline at Bay Joe Wise Headland in Louisiana.
Urban Planning Design Considerations for Better Water Quality, Bill Hunt NC S...Fu Michael Justin
This document discusses various studies and case studies related to the impacts of development on water quality. It summarizes that effective solutions require maintaining watershed hydrology through low impact development techniques like reducing impervious surfaces, incorporating bioretention areas, and maintaining wetlands and riparian buffers. A case study of the Carpenter Village development showed positive results from using clustered housing, narrow streets, integrated open space and bioretention to minimize impacts on water quality.
This document provides information on HydroQualASA's coastal environmental projects and services. It summarizes their experience studying Dubai Creek water quality and sediment characteristics. It also lists their modeling and assessment services, which include hydrodynamic, water quality, oil spill, chemical dispersion, and biological modeling. These services help clients address issues like navigable waterways, coastal development impacts, and wastewater discharges.
This document discusses catchment management and abstractions. It provides learning objectives on abstraction risk, impacts from abstractions, environmental flows, and potential measures. It then discusses various topics related to abstractions including risk assessment, impacts from abstractions, environmental flows, and existing and future measures for regulating abstractions. Drinking water safety plans, groundwater protection plans, and integrated catchment management are also summarized as they relate to abstraction and drinking water quality.
This document summarizes a study on stormwater impacts to McVicar Creek. The study aimed to: identify impacts; characterize them through a stream assessment; identify 3 representative sites; pursue further research; and develop remediation recommendations. The initial assessment identified 3 sites - Court Street, Castlegreen, and County Fair - for further study. Additional data collection and stakeholder workshops were held. The workshops developed stormwater management objectives and site-specific recommendations. For Court Street, increased enforcement and education were recommended. For Castlegreen, investigating infrastructure and partnering with local groups. For County Fair, educating landowners and considering end-of-pipe solutions were recommended. The final recommendations emphasized objectives and further stakeholder
Low impact development (LID) techniques aim to manage stormwater close to its source through practices like bioretention and permeable pavements. The presentation discusses LID manuals and projects in Jacksonville including recreational LID demonstrations at parks and a Valens Drive retrofit. Hydrologic modeling shows LID increases local water tables and runoff capture. Potential benefits include reduced flooding, better water quality and lower infrastructure costs. The City plans to monitor the Valens Drive project and expand LID coverage.
Contractor Awareness Training Below Ground Facilities 2016Fairfax County
This document provides an overview of a stormwater maintenance awareness training held by the Department of Public Works and Environmental Services in Fairfax County, VA. The training covered the history of stormwater regulations, types of stormwater management facilities like underground detention, sand filters, and manufactured BMPs. It discussed common maintenance issues for these facilities like debris and sediment accumulation, damage to components, and remedial actions required. The document included pictures of different facility components and deficiencies to illustrate key points.
Kevin Vought Select Samples of Water Resource CapabilityKevin Vought, P.E.
Kevin Vought has 15 years of experience conducting various groundwater, surface water, and coastal modeling projects. He presented on his work using modeling tools like MODFLOW, MT3DMS, SEAWAT, MIKE SHE, and ADCIRC to assess groundwater availability, contaminant transport, surface water-groundwater interaction, and coastal hydrodynamics. Some key projects included developing integrated models for the Broward County IWRMMP and modeling circulation patterns for alternatives to restore the shoreline at Bay Joe Wise Headland in Louisiana.
Urban Planning Design Considerations for Better Water Quality, Bill Hunt NC S...Fu Michael Justin
This document discusses various studies and case studies related to the impacts of development on water quality. It summarizes that effective solutions require maintaining watershed hydrology through low impact development techniques like reducing impervious surfaces, incorporating bioretention areas, and maintaining wetlands and riparian buffers. A case study of the Carpenter Village development showed positive results from using clustered housing, narrow streets, integrated open space and bioretention to minimize impacts on water quality.
This document provides information on HydroQualASA's coastal environmental projects and services. It summarizes their experience studying Dubai Creek water quality and sediment characteristics. It also lists their modeling and assessment services, which include hydrodynamic, water quality, oil spill, chemical dispersion, and biological modeling. These services help clients address issues like navigable waterways, coastal development impacts, and wastewater discharges.
This document discusses catchment management and abstractions. It provides learning objectives on abstraction risk, impacts from abstractions, environmental flows, and potential measures. It then discusses various topics related to abstractions including risk assessment, impacts from abstractions, environmental flows, and existing and future measures for regulating abstractions. Drinking water safety plans, groundwater protection plans, and integrated catchment management are also summarized as they relate to abstraction and drinking water quality.
Contractor Awareness Training Above Ground Facilities Part 2 2016Fairfax County
This document provides an overview of a stormwater maintenance awareness training presented by the Maintenance and Stormwater Management Division (MSMD) of the Fairfax County Department of Public Works and Environmental Services. The training covers the history of stormwater regulations and management, common stormwater best management practices (SWM/BMPs) such as infiltration trenches and permeable pavement, potential deficiencies in these facilities, and recommended remedies. The document includes pictures of properly functioning and deficient examples of various above-ground SWM/BMPs and discusses maintenance issues and solutions.
The document provides an overview of water planning in Queensland. It discusses (1) previous problems with incremental water management that did not consider basin-wide impacts, (2) the state's responsibility to manage water resources through plans and licenses, and (3) the current two-part water planning process involving water resource plans and resource operations plans developed through technical assessments, community consultation, and hydrological modeling to allocate water between human and environmental needs while allowing water trading.
This document provides an overview and approach for revising the general permit for construction activities in California. It discusses moving towards a risk-based permit approach that establishes tiered implementation and monitoring requirements based on a project's sediment yield risk and the receiving water's sensitivity. A key goal is adopting a standard to avoid, minimize, and mitigate hydromodification impacts from new and redevelopment projects. Runoff reduction measures are also discussed as an option to address hydromodification impacts.
The document summarizes a workshop on stormwater management in the Coastal Plain held in Virginia Beach. It discusses the unique challenges of managing stormwater in flat, low-lying coastal areas with shallow water tables. These include highly altered drainage, connections between stormwater practices and estuaries, and seasonal heavy rainfall events. The workshop covered regulatory requirements, low impact development techniques, and tools to help communities meet water quality and quantity goals in Coastal Plain environments.
Dead Run Stream Restoration Project Meeting: Feb. 18, 2015Fairfax County
This document summarizes a public meeting to discuss a stream restoration project along Dead Run in Fairfax County, Virginia. The meeting outlined Fairfax County's watershed planning efforts, introduced the Dead Run Stream Restoration Project objectives to improve water quality and reduce pollution, and presented the proposed design which uses natural channel design principles to restore three segments of the stream in a way that minimizes tree removal and disturbance. Next steps include finalizing the preliminary design, another public meeting, final design, construction anticipated in 2017-2018, and ongoing maintenance after completion.
The document summarizes a study that monitored roadway runoff and developed design guidance for roadway BMPs. Field studies were conducted at six sub-basins near an intersection of I-80 and I-680 in Omaha, Nebraska. Water quality samples found metals, COD, TSS, and TDS to be major contaminants in runoff. Roadside vegetation was effective at reducing runoff. The existing detention basin provided some pollutant load reductions. Based on results, design guidance was created for BMPs like vegetated swales, bioretention cells, and sand filters to treat roadway runoff.
Stormwater Maintenance Awareness Training, Part V: Vegetative Practices, Octo...Fairfax County
This document outlines a training provided by the Fairfax County Department of Public Works and Environmental Services on stormwater maintenance. The training covered the history of stormwater regulations, types of stormwater management facilities like bioretention areas and vegetated swales, common maintenance issues for these facilities, and remedies for addressing issues. It included presentations, examples of properly functioning facilities, and potential deficiencies requiring maintenance. Additional resources on stormwater best management practices were also provided. The goal of the training was to raise awareness of maintenance needs for privately maintained stormwater management facilities.
This document outlines the guidelines for constructing check dams in order to provide drinking water facilities and groundwater recharge. It discusses the objectives of check dams, selection criteria for areas to implement check dams, types of check dams, design aspects, implementation arrangements, operation and maintenance responsibilities, funding arrangements, institutional arrangements for management, and monitoring mechanisms. Check dams are constructed across small rivers and streams to reduce water flow during monsoons and allow water to seep into the soil.
This document summarizes a presentation about plans to restore the Upper Pohick Creek watershed and the Harford stream specifically. It discusses the existing poor conditions of the stream including erosion, sediment deposition, and infrastructure issues. The goals of restoration are to improve water quality, habitat, and flood mitigation. A multi-step design and approval process is outlined that involves community input, data collection, concept planning, and final construction.
Stormwater Maintenance Awareness Training, Part I: Overview, October 6, 2015Fairfax County
This document provides an overview of a stormwater maintenance awareness training held in Fairfax County, VA. The training covered the history of stormwater management regulations, county inspection protocols, common stormwater management facility types and their purposes, typical maintenance issues, and remedies. It included presentations on above ground facilities, below ground facilities, and vegetative practices. The intended audience was those responsible for maintaining privately owned stormwater facilities.
This document summarizes a public information center for a study to reduce basement and surface flooding in Study Area 39 located in Etobicoke. The study will identify the preferred solution to improve the stormwater and sanitary systems and reduce flooding risks. Alternative solutions being considered include source controls on private property, conveyance controls in sewer systems, and end-of-pipe controls such as wet ponds, underground storage, and dry ponds. Residents experienced flooding in 144 properties during a 2013 storm. The study area, causes of flooding, and Class EA process are described.
This document provides a summary of key concepts in three sentences:
This manual from the Bureau of Reclamation discusses water measurement practices to improve water management. It provides guidance on selecting, operating, and maintaining water measurement devices and describes common open channel measurement methods such as weirs and flumes. The manual is intended to help water users and districts implement better water measurement programs that can lead to benefits like equitable water allocation, reduced losses, and improved conservation.
The document discusses a public information centre being held to introduce a study examining basement flooding and surface flooding in Study Area 40. The meeting will present information on the causes of flooding, possible solutions, and next steps in the study process. Attendees are encouraged to provide input. The study aims to identify solutions to reduce flooding risks and improve stormwater quality in the area.
The document summarizes a public information centre for a basement flooding and water quality improvement study in Study Area 41. It provides background on the study area and objectives of the meeting, which are to present issues like flooding causes and impacts, potential alternative measures, and next steps. It also outlines the municipal environmental assessment process and opportunities for public input.
This document provides information from a Public Information Centre meeting regarding a study to address basement flooding and surface water pollution in Study Area 35. The meeting introduced the problem, study approach, and potential solutions to reduce flooding risk and improve water quality. Attendees were encouraged to provide feedback and input. Next steps include considering public comments to evaluate alternative solutions, with a follow up meeting planned for late 2016 to present recommendations.
The Runoff Reduction Method (RRM) provides a three-step approach for complying with stormwater regulations that incentivizes minimizing runoff from development sites. Step 1 focuses on better site planning to reduce impervious surfaces. Step 2 uses BMPs like permeable pavement and rain gardens to further reduce runoff volumes. Step 3 employs additional BMPs to treat any remaining runoff. The RRM calculates a site-specific treatment volume based on cover types and soil conditions to quantify BMP performance in reducing runoff. It provides incentives to conserve forests and limit soil disturbance to reduce runoff.
Dwindling availability of water, combined with increases and competition in demand, climate change impacts, trends toward true cost water pricing, among other “drivers,” necessitates that urban water planning incorporate consideration of strategies for use, conservation, and reuse of treated wastewater and stormwater. Three innovative initiatives will be discussed as illustrations of “win-win” approaches that achieve effective water management (urban water security/sustainability) while facilitating economic development.
This document summarizes a public information meeting about a study investigating basement flooding and stormwater runoff quality control in Study Area 36 in Etobicoke, Toronto. The meeting provided background on the study purpose and objectives, potential causes of flooding in the area, and possible alternative solutions. Attendees were encouraged to provide feedback and input on the evaluation criteria for solutions. Homeowners were also informed about actions they can take to prevent future flooding and about the City's subsidy program for flood protection devices.
DSD-INT 2015 - The future of computer modeling of coastal wetland - maselheDeltares
The document summarizes the modeling approach and results of a team effort to develop an integrated modeling system for coastal Louisiana. The team used several models linked together to simulate hydrodynamics, morphodynamics, nutrient dynamics, and vegetation changes over long time periods. Validation showed the models reasonably represented water levels, salinity, sediment changes and more. Production runs examined scenarios with and without sediment diversions. The diversions led to increased land building and changes in water quality and vegetation over 50 years. The modeling effort aimed to improve understanding of coastal processes and inform restoration planning.
This document provides an overview and agenda for a training module on extended dry detention basins and infiltration practices. The first lecture reviews watershed planning concepts from Module 1 and introduces extended dry detention basins. The second lecture covers the design of extended dry detention basins through a design example and activity. The third lecture discusses infiltration practices including infiltration basins, trenches, and porous pavement. The training aims to explain structural best management practices for treating stormwater runoff.
This document outlines a stormwater management plan for the Sea Aire subdivision in Charleston, SC. It discusses the problem of increased runoff from development, goals of meeting state regulations, and constraints like cost and skills. It considers questions from users, clients, and designers. The plan evaluates conventional and low impact development stormwater methods like green roofs, rain gardens, and permeable pavement. Hydraulic modeling is used to analyze runoff and select options like vegetated roofs, rain barrels, infiltration trenches and bioretention cells that together can store runoff from a 25-year storm on individual properties. The plan addresses sustainability, budget, timeline and references.
This document discusses strategies for restoring the built environment to better manage stormwater runoff. It provides examples of how existing development in Philadelphia alters the natural water balance by increasing runoff and decreasing groundwater recharge. Various case studies and projects are described that implement green infrastructure techniques like rain gardens, green roofs, porous pavements, and cisterns to slow, spread, and sink stormwater runoff on site. Challenges to changing practices include local regulations, construction knowledge, maintenance needs, and aesthetic preferences.
Contractor Awareness Training Above Ground Facilities Part 2 2016Fairfax County
This document provides an overview of a stormwater maintenance awareness training presented by the Maintenance and Stormwater Management Division (MSMD) of the Fairfax County Department of Public Works and Environmental Services. The training covers the history of stormwater regulations and management, common stormwater best management practices (SWM/BMPs) such as infiltration trenches and permeable pavement, potential deficiencies in these facilities, and recommended remedies. The document includes pictures of properly functioning and deficient examples of various above-ground SWM/BMPs and discusses maintenance issues and solutions.
The document provides an overview of water planning in Queensland. It discusses (1) previous problems with incremental water management that did not consider basin-wide impacts, (2) the state's responsibility to manage water resources through plans and licenses, and (3) the current two-part water planning process involving water resource plans and resource operations plans developed through technical assessments, community consultation, and hydrological modeling to allocate water between human and environmental needs while allowing water trading.
This document provides an overview and approach for revising the general permit for construction activities in California. It discusses moving towards a risk-based permit approach that establishes tiered implementation and monitoring requirements based on a project's sediment yield risk and the receiving water's sensitivity. A key goal is adopting a standard to avoid, minimize, and mitigate hydromodification impacts from new and redevelopment projects. Runoff reduction measures are also discussed as an option to address hydromodification impacts.
The document summarizes a workshop on stormwater management in the Coastal Plain held in Virginia Beach. It discusses the unique challenges of managing stormwater in flat, low-lying coastal areas with shallow water tables. These include highly altered drainage, connections between stormwater practices and estuaries, and seasonal heavy rainfall events. The workshop covered regulatory requirements, low impact development techniques, and tools to help communities meet water quality and quantity goals in Coastal Plain environments.
Dead Run Stream Restoration Project Meeting: Feb. 18, 2015Fairfax County
This document summarizes a public meeting to discuss a stream restoration project along Dead Run in Fairfax County, Virginia. The meeting outlined Fairfax County's watershed planning efforts, introduced the Dead Run Stream Restoration Project objectives to improve water quality and reduce pollution, and presented the proposed design which uses natural channel design principles to restore three segments of the stream in a way that minimizes tree removal and disturbance. Next steps include finalizing the preliminary design, another public meeting, final design, construction anticipated in 2017-2018, and ongoing maintenance after completion.
The document summarizes a study that monitored roadway runoff and developed design guidance for roadway BMPs. Field studies were conducted at six sub-basins near an intersection of I-80 and I-680 in Omaha, Nebraska. Water quality samples found metals, COD, TSS, and TDS to be major contaminants in runoff. Roadside vegetation was effective at reducing runoff. The existing detention basin provided some pollutant load reductions. Based on results, design guidance was created for BMPs like vegetated swales, bioretention cells, and sand filters to treat roadway runoff.
Stormwater Maintenance Awareness Training, Part V: Vegetative Practices, Octo...Fairfax County
This document outlines a training provided by the Fairfax County Department of Public Works and Environmental Services on stormwater maintenance. The training covered the history of stormwater regulations, types of stormwater management facilities like bioretention areas and vegetated swales, common maintenance issues for these facilities, and remedies for addressing issues. It included presentations, examples of properly functioning facilities, and potential deficiencies requiring maintenance. Additional resources on stormwater best management practices were also provided. The goal of the training was to raise awareness of maintenance needs for privately maintained stormwater management facilities.
This document outlines the guidelines for constructing check dams in order to provide drinking water facilities and groundwater recharge. It discusses the objectives of check dams, selection criteria for areas to implement check dams, types of check dams, design aspects, implementation arrangements, operation and maintenance responsibilities, funding arrangements, institutional arrangements for management, and monitoring mechanisms. Check dams are constructed across small rivers and streams to reduce water flow during monsoons and allow water to seep into the soil.
This document summarizes a presentation about plans to restore the Upper Pohick Creek watershed and the Harford stream specifically. It discusses the existing poor conditions of the stream including erosion, sediment deposition, and infrastructure issues. The goals of restoration are to improve water quality, habitat, and flood mitigation. A multi-step design and approval process is outlined that involves community input, data collection, concept planning, and final construction.
Stormwater Maintenance Awareness Training, Part I: Overview, October 6, 2015Fairfax County
This document provides an overview of a stormwater maintenance awareness training held in Fairfax County, VA. The training covered the history of stormwater management regulations, county inspection protocols, common stormwater management facility types and their purposes, typical maintenance issues, and remedies. It included presentations on above ground facilities, below ground facilities, and vegetative practices. The intended audience was those responsible for maintaining privately owned stormwater facilities.
This document summarizes a public information center for a study to reduce basement and surface flooding in Study Area 39 located in Etobicoke. The study will identify the preferred solution to improve the stormwater and sanitary systems and reduce flooding risks. Alternative solutions being considered include source controls on private property, conveyance controls in sewer systems, and end-of-pipe controls such as wet ponds, underground storage, and dry ponds. Residents experienced flooding in 144 properties during a 2013 storm. The study area, causes of flooding, and Class EA process are described.
This document provides a summary of key concepts in three sentences:
This manual from the Bureau of Reclamation discusses water measurement practices to improve water management. It provides guidance on selecting, operating, and maintaining water measurement devices and describes common open channel measurement methods such as weirs and flumes. The manual is intended to help water users and districts implement better water measurement programs that can lead to benefits like equitable water allocation, reduced losses, and improved conservation.
The document discusses a public information centre being held to introduce a study examining basement flooding and surface flooding in Study Area 40. The meeting will present information on the causes of flooding, possible solutions, and next steps in the study process. Attendees are encouraged to provide input. The study aims to identify solutions to reduce flooding risks and improve stormwater quality in the area.
The document summarizes a public information centre for a basement flooding and water quality improvement study in Study Area 41. It provides background on the study area and objectives of the meeting, which are to present issues like flooding causes and impacts, potential alternative measures, and next steps. It also outlines the municipal environmental assessment process and opportunities for public input.
This document provides information from a Public Information Centre meeting regarding a study to address basement flooding and surface water pollution in Study Area 35. The meeting introduced the problem, study approach, and potential solutions to reduce flooding risk and improve water quality. Attendees were encouraged to provide feedback and input. Next steps include considering public comments to evaluate alternative solutions, with a follow up meeting planned for late 2016 to present recommendations.
The Runoff Reduction Method (RRM) provides a three-step approach for complying with stormwater regulations that incentivizes minimizing runoff from development sites. Step 1 focuses on better site planning to reduce impervious surfaces. Step 2 uses BMPs like permeable pavement and rain gardens to further reduce runoff volumes. Step 3 employs additional BMPs to treat any remaining runoff. The RRM calculates a site-specific treatment volume based on cover types and soil conditions to quantify BMP performance in reducing runoff. It provides incentives to conserve forests and limit soil disturbance to reduce runoff.
Dwindling availability of water, combined with increases and competition in demand, climate change impacts, trends toward true cost water pricing, among other “drivers,” necessitates that urban water planning incorporate consideration of strategies for use, conservation, and reuse of treated wastewater and stormwater. Three innovative initiatives will be discussed as illustrations of “win-win” approaches that achieve effective water management (urban water security/sustainability) while facilitating economic development.
This document summarizes a public information meeting about a study investigating basement flooding and stormwater runoff quality control in Study Area 36 in Etobicoke, Toronto. The meeting provided background on the study purpose and objectives, potential causes of flooding in the area, and possible alternative solutions. Attendees were encouraged to provide feedback and input on the evaluation criteria for solutions. Homeowners were also informed about actions they can take to prevent future flooding and about the City's subsidy program for flood protection devices.
DSD-INT 2015 - The future of computer modeling of coastal wetland - maselheDeltares
The document summarizes the modeling approach and results of a team effort to develop an integrated modeling system for coastal Louisiana. The team used several models linked together to simulate hydrodynamics, morphodynamics, nutrient dynamics, and vegetation changes over long time periods. Validation showed the models reasonably represented water levels, salinity, sediment changes and more. Production runs examined scenarios with and without sediment diversions. The diversions led to increased land building and changes in water quality and vegetation over 50 years. The modeling effort aimed to improve understanding of coastal processes and inform restoration planning.
This document provides an overview and agenda for a training module on extended dry detention basins and infiltration practices. The first lecture reviews watershed planning concepts from Module 1 and introduces extended dry detention basins. The second lecture covers the design of extended dry detention basins through a design example and activity. The third lecture discusses infiltration practices including infiltration basins, trenches, and porous pavement. The training aims to explain structural best management practices for treating stormwater runoff.
This document outlines a stormwater management plan for the Sea Aire subdivision in Charleston, SC. It discusses the problem of increased runoff from development, goals of meeting state regulations, and constraints like cost and skills. It considers questions from users, clients, and designers. The plan evaluates conventional and low impact development stormwater methods like green roofs, rain gardens, and permeable pavement. Hydraulic modeling is used to analyze runoff and select options like vegetated roofs, rain barrels, infiltration trenches and bioretention cells that together can store runoff from a 25-year storm on individual properties. The plan addresses sustainability, budget, timeline and references.
This document discusses strategies for restoring the built environment to better manage stormwater runoff. It provides examples of how existing development in Philadelphia alters the natural water balance by increasing runoff and decreasing groundwater recharge. Various case studies and projects are described that implement green infrastructure techniques like rain gardens, green roofs, porous pavements, and cisterns to slow, spread, and sink stormwater runoff on site. Challenges to changing practices include local regulations, construction knowledge, maintenance needs, and aesthetic preferences.
The document discusses sustainable site development and low impact development techniques. It provides an overview of low impact development specifics including maintaining natural hydrology, selecting appropriate green building certification credits, and using techniques like bioretention areas, vegetated swales, permeable paving, and rainwater harvesting. The summary also mentions how these techniques can help projects earn certain LEED credits for stormwater management and reducing heat island effect.
California regulates stormwater through permits that establish requirements for construction sites. The state regulates stormwater as a pollutant and point source, requiring permits under the Clean Water Act. Regulations establish risk levels for construction sites based on sediment risk and receiving water risk. High risk sites have more stringent controls. Permits set numeric limits for turbidity and pH and require Storm Water Pollution Prevention Plans. The state also regulates wetland and stream fill through policies of no net habitat loss, requiring replacement of impacted areas.
February 11, 2014 public meeting presentation for three proposed stormwater facility management projects off of Cabin Branch of Great Seneca Creek. (powerpoint file)
Why we need a structured approach to surface water managementSue McKinney
There is no doubt that there is a need to think differently about how surface water is managed if flooding is not to be a persistent problem. A structured approach to this problem is outlined in this presentation.
The document discusses low impact development (LID) as a more sustainable approach to land development and stormwater management that aims to mimic natural hydrology. It outlines various LID techniques like narrower streets, bioretention areas, permeable paving, green roofs, and rain barrels that can reduce runoff and treat pollutants on-site in a decentralized manner. Implementing LID provides environmental, community, and local government benefits like protecting water resources, reducing infrastructure costs, and preserving open spaces.
This presentation notes that in economic terms flooding is the major natural disaster experience in Trinidad and discusses the lack of sustainability of the current approach to drainage and flood mitigation and proposes some solutions such as storm water management at source as a possible solution to flooding
Sedimentation in Sotorage Projects- Challenges and Mitigation MeasuresTEJASWI SHARMA
This slideshare is brief introduction about the sedimentation encountered in storage projects (reservoir) with the mitigation measures that could be applied.
This document provides an agenda and overview for a training module on rain gardens and bioretention. The agenda includes lectures and a design activity on bioretention and rain garden design examples, considerations for implementation, operations and maintenance, and vegetation. Bioretention is defined as a BMP that utilizes plants, soils and microbes to filter and infiltrate stormwater runoff, differing from a rain garden through the inclusion of an engineered underdrain system. Key components of bioretention design including pretreatment, ponding area, vegetation, soil mixture, underdrains and high flow structures are discussed.
This document summarizes the integrated habitat restoration and stormwater treatment project at Alewife Reservation in Cambridge, MA. The project aims to reduce stormwater flows to Alewife Brook while restoring degraded uplands and wetlands. It includes creation of a 6.5 acre stormwater treatment wetland and 0.71 acres of compensatory wetland habitat. Over 115,000 wetland plants and 3,800 upland plants were installed to create a diverse mosaic of native plant communities. The wetland is designed to detain stormwater and improve water quality through natural processes before discharge to the Little River.
Environmental Issues Affecting Real Estate Smu Cox Real Estate Law Classslongroy
This document summarizes several key environmental issues that can affect real estate transactions and development projects. It discusses regulations pertaining to waste management (RCRA/Texas SWDA), hazardous substance cleanup (CERCLA/Texas SWDA), and brownfield redevelopment. It also covers stormwater management and permitting requirements, protections for floodplains and wetlands, asbestos and lead regulations, the Endangered Species Act, and emerging trends around greenhouse gas regulation and sustainable development.
The document discusses low impact development (LID) engineering and landscape design considerations. It outlines various integrated management practices (IMPs) that can be used like bioretention, bioswales, infiltration ponds/trenches, and permeable pavement. These practices aim to mimic natural hydrology and treat stormwater through filtration, microbial breakdown, and infiltration/evapotranspiration. The document provides guidance on sizing, locating, and maintaining different IMPs based on treatment needs and technical limitations.
The document discusses low impact development (LID) as an alternative to conventional stormwater management. LID aims to mimic natural water flows by using small-scale stormwater management techniques to filter and infiltrate runoff close to its source. Some LID practices mentioned include bioretention cells, permeable pavements, green roofs, and rainwater harvesting. The document notes that while initial costs may be higher, LID can reduce long-term infrastructure costs and provide other environmental benefits compared to conventional stormwater approaches. It provides resources for learning more about implementing LID strategies.
This document discusses estimated recoverable storage (ERS), which is defined as the estimated amount of groundwater that could potentially be recovered from an aquifer between 25-75% of the aquifer's volume. It notes that ERS does not necessarily indicate how much water is available for production or can be withdrawn without harming the aquifer. While ERS indicates the total water in an aquifer, the document cautions that actual recoverability depends on aquifer type, water quality impacts, subsidence risks, and other factors. It concludes that ERS should be understood in context of local aquifer characteristics to determine its relevance for groundwater planning and management.
The document provides an overview of the Agricultural Conservation Planning Framework (ACPF), a database, concept, and GIS toolbox for watershed planning in the Midwest. The ACPF uses data on soils, land use, terrain and other factors to identify opportunities for placing different conservation practices in fields, at field edges, and in riparian zones. It emphasizes a tiered approach starting with improving soil health within fields, then placing water control practices below fields and riparian buffers along streams. The ACPF can help develop planning alternatives to reduce nutrient loads and prioritize practices, but does not make final recommendations, as watershed planning requires local stakeholder involvement.
Sustainable Hydropower Development Alternatives for the MekongJessicaNagtalon
Presentation by Gregory Thomas, CEO of the Natural Heritage Institute on NHI's work in Cambodia and Laos to produce sustainable hydropower development alternatives to protect the extraordinary natural productivity of the Mekong River.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
How to Build a Module in Odoo 17 Using the Scaffold MethodCeline George
Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
Assessment and Planning in Educational technology.pptxKavitha Krishnan
In an education system, it is understood that assessment is only for the students, but on the other hand, the Assessment of teachers is also an important aspect of the education system that ensures teachers are providing high-quality instruction to students. The assessment process can be used to provide feedback and support for professional development, to inform decisions about teacher retention or promotion, or to evaluate teacher effectiveness for accountability purposes.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
How to Add Chatter in the odoo 17 ERP ModuleCeline George
In Odoo, the chatter is like a chat tool that helps you work together on records. You can leave notes and track things, making it easier to talk with your team and partners. Inside chatter, all communication history, activity, and changes will be displayed.
Physiology and chemistry of skin and pigmentation, hairs, scalp, lips and nail, Cleansing cream, Lotions, Face powders, Face packs, Lipsticks, Bath products, soaps and baby product,
Preparation and standardization of the following : Tonic, Bleaches, Dentifrices and Mouth washes & Tooth Pastes, Cosmetics for Nails.
3. Best Management Practice
(BMP)
Best – State of the Practice
No definitive answer
Past experience, testing, research,
Unique to site
Management – Responsible Parties
Improve water quality, meet NPDES Phase II
Jurisdictional specific
Meet specific requirements of a regional
Practice – Action or Implementation
Practice = defined to carry out, apply, or to
do or perform often.
A
4. Basic BMP Principles
Plan for stormwater management
Mimic natural hydrology
Sustainable and “be green”
Provide a level of service
Improve water quality
Increase initial abstraction
Promote infiltration, retention & ET
“Treat” the stormwater runoff
Natural processes
Treatment trains
A
6. TREAT
Detention and Treatment
Structural BMPs
detain runoff
Extended Detention
Basins
• Wet
• Dry
Extended Detention
Wetlands
Infiltration basins
Typically used as
larger, centralized
facilities
Topeka KS
A
7. Example site
l
ne
n
ha
C
in
Ma
Design Documents
e
i dg
Br
– APWA 5600
– BMP Manual
– Watershed
Master Plans
TREAT
Commercial
Building
BioFilters
Wet
Pond
Grass Swale
Streambank
Biostabilization
Culvert
Roa
d
w ay
A
8. Structural BMP Consideration
Pollutant removal efficiency
Water quality volume
Site suitability
Tributary area
Dimensions (depth, length-width ratio)
Outlet
Emergency spillway
Maintenance easement
Routine and non-routine maintenance
A
13. Water Quality Volume (WQv)
Water Quality Volume
(WQv): The storage needed
to capture and treat 90% of
the average annual storm
runoff volume
Water Quality Storm: The
storm event that produces ≤
90% volume of all daily
storms in a year
WQv
Extended detention and
wetlands sizing is based on
the WQv
A
14. Kansas City Water Quality
Storm
Young and McEnroe
(http://kcmetro.apwa.net)
Daily Precipitation (in)
A
2.
7
2.
5
2.
3
1.
9
2.
1
1.
5
1.
7
1.
1
1.
3
0.
5
0.
7
0.
9
45
40
35
30
25
20
15
10
5
0
0.
1
0.
3
Water Quality
Storm = 1.37 in
# of days > or=
2003 Kansas City Precip events
15. Why Use the WQv to size
BMP?
Retain runoff long enough to get
water quality benefits
Reducing erosive flows from
smaller runoff events
A
16. Water Quality Volume
Calculation
Two methods
Short-Cut Method
•
•
Sites < 10 acres
Only 1 predominant cover type
Small Storm Hydrology Method
•
Larger or more heterogeneous drainage
areas
A
17. WQv Calculation
Short-Cut Method
WQv = P*Rv
P = 24 hour Water Quality Storm (inches)
Rv = Volumetric run coefficient =
0.05+0.009(I)
I = % site Imperviousness
A
18. WQv Calculation
Small Storm Hydrology Method
WQv = P*Weighted Rv
Weighted Rv = Σ(Rvi*Aci)/Total area (ac)
Rvi = Volumetric runoff coefficient for cover
type (table)
Aci = Area of cover type i (ac)
A
20. Why the term “Extended”
Detention?
Extended: Designed to release the WQv over a period
of 40 hours
Allows time for more particles and associated
pollutants to settle out
Reduces the downstream velocity and erosive
conditions
More closely imitates natural release rates and
duration
A
23. 40-Hour Drawdown Impacts
1000
Developed
Uncontrolled
100
Flow
0.80 psf
Developed
Controlled
10
0.26 psf
•10-year control
•1-year control
•WQv – extended
detention with 40 hr
drawdown
1
Undeveloped
0.1
0.01
0.1
more frequent than 1-yr
1
1-yr
2-yr
Storm Return Interval
10
10-yr
100
100-yr
A
24. BMP Manual
Extended Detention
Water Quality (40-hr)
Pollutant removal through
• Settling
• Biological uptake (more for
wetland)
• Permanent Pool
• WQv = Volume above the
permanent pool
Stream Sustainability (40-hr)
Mimic undeveloped
conditions for full range of
hydrology
Can meet flood control
objectives
A
27. EWDB Littoral Bench
Provides water quality
treatment
Mild slope serves as
safety feature around
perimeter of permanent
pool
25% to 50% of
permanent pool surface
area
Helps control geese
access
Topeka, KS
A
29. EWDB Permanent Pool
Water quality volume
(WQv) mixes with
permanent pool
WQv released over 40
hours
Minimum depth of 6-ft
Residence time of 14
days
Significantly more
water quality benefit
than EDDB
Topeka, KS
A
30. EWDB Outlet Structure
Release the WQv over a period of
40 hours
Protected by well screens, trash
racks or grates
Located as far from inlet as
possible
Various outlet structure options
Single Orifice
Perforated Riser or Plate
V-notch Weir
Source: Hubbard Brook LTER
A
32. EWDB Vegetation
Upland area: Native
grasses (preferable) or
turf on berms and side
slopes
Littoral Zone: Native
wetland species
Recommend 3-5 native
species
Kansas City, MO
Soft Rush, Juncus effusus
A
33. EWDB Siting Considerations
Off-line, outside of stream corridor
EWDBs can be located within larger flood
control facilities
Minimum 20 feet setback
Not on fill sites or steep slopes (unless
enhanced)
Use fences and landscaping to impede access
areas to address public safety concerns
Outflow structure shall be fenced
A
38. EDW Forebay
Same function as
EWDB
Should hold at least
10% of the WQv
Separated from the
wetland by a earth
weir, gabion or loose
riprap wall
Topeka, KS
A
41. EDW Micropool
Prevents outlet clogging
Allows further settling of
sediment
Should have a capacity of
at least 10% of WQv
Surrounded with a safety
bench
A
43. EDW Vegetation
Vegetation should cover 50-75% of surface area
3-5 native species are recommended
Select species based on stress tolerance and ability
to handle variations in water availability
Consult local experts
Lenexa, KS
Topeka, KS
Topeka, KS
A
44. EDW Siting Considerations
Off-line, outside of stream corridor
Perform water budget analysis to ensure
permanent pool
Soils should be suited for wetland species
Hydric soils with high phosphorous affinity
Not on fill sites or steep slopes (unless
enhanced)
Use fences and landscaping to impede
access areas of public safety concern
Outflow structure shall be fenced
A
45. Extended Wet Detention
versus
Extended Detention Wetlands
Similarities
Water quality volume mixes with
permanent pool
40 hour drawdown of water quality
volume (WQv)
Differences
Depth of permanent pool (18 inches in
wetland vs. 6 to 12 feet in basin)
Vegetation types and planting
configurations
A
47. EWDB Advantages
Settling of suspended
solids
Pollutant uptake by pond
vegetation
Flood control via peak
discharge attenuation
Control of channel erosion
by reducing downstream
flow velocities
Creation of wildlife habitat
Recreational and aesthetic
benefits
Topeka, KS
A
48. EDW Advantages
Settling of suspended solids
Pollutant uptake by wetland
vegetation
Flood control via peak
discharge attenuation
Control of channel erosion
by reducing downstream
flow velocities
Creation of wildlife and
aquatic habitats
Recreational and aesthetic
benefits
Some groundwater recharge
A
49. EWDB Disadvantages
Potential safety concerns
Additional maintenance due to
sediment removal, floating
trash, scum, and algal blooms
Potential odor problems
Need conditions to sustain
permanent pool
Resident waterfowl can
become a source of fecal
coliform and nutrients
Vector issues may result in
additional maintenance
requirements
A
50. EDW Disadvantages
Require more space, due
to shallower depth of
water storage
Additional maintenance
due to vegetation
overgrowth
Requires larger drainage
area to sustain permanent
pool
Vector issues can result in
increased maintenance
requirements
Site limitations in urban
areas
A
52. Lecture 2
Design of EWDB EDW
Discuss key design features
Introduce calculations for each major
component
Perform example calculations
A
53. Extended Wet Detention Basin
Key Design Features
Water quality storage volume
Permanent pool
Outlet structures
Orifice
Perforated riser or plate
V-notch weir
Pool shape
Basin shape
Forebay
Littoral bench
Vegetation
Topeka, KS
A
54. Design Example
26 acre drainage
Land use
1.6 acres of flat
roofs
8.8 acres of parking
lot
3.3 acres of narrow
streets
12.3 acres of silty
soil
53 % impervious
Outlet Structure
designed for 40 hour
release of WQv
New Development Site
A
55. Water Quality Storage Volume
EWDB Design Procedure Form
i.
ii.
Tributary area = 26 acres
Calculate water quality storage volume
A
56. Water Quality Storage Volume
ii.
Calculate Water Quality Storage
Volume (WQv)
Two methods
Short-Cut Method
•
•
Sites 10 acres
Only 1 predominant cover type
Small Storm Hydrology Method
•
Larger or more heterogeneous
drainage areas
A
57. Water Quality Storage Volume
Short-Cut Method
WQv = P*Rv
P = 24 hour Water Quality Storm (inches)
P = 1.37 inches (Kansas City)
Rv = Volumetric run coefficient = 0.05+0.009(I)
I = % site imperviousness
A
58. Water Quality Storage Volume
Small Storm Hydrology Method
WQv = (P)*(Weighted Rv)
Weighted Rv = Σ(Rvi*Aci)/Total area (ac)
•
•
Rvi = Volumetric runoff coefficient for cover type
(table)
Aci = Area of cover type i (ac)
A
59. Rv Table
TABLE 7
VOLUMETRIC COEFFICIENTS FOR URBAN RUNOFF FOR
DIRECTLY CONNECTED IMPERVIOUS AREAS
(CLAYTOR AND SCHUELER 1996)
Rainfall
(inches)
Flat roofs and
large unpaved
parking lots
Pitched roofs and
large impervious
areas
(large parking lots)
Small
impervious
areas and
narrow
streets
Silty
soils
HSG-B
Clayey soils
HSG-C and
D
0.75
0.82
0.97
0.66
0.11
0.20
1.00
0.84
0.97
0.70
0.11
0.21
1.25
0.86
0.98
0.74
0.13
0.22
1.37
0.87
0.98
0.75
0.14
0.23
1.50
0.88
0.99
0.77
0.15
0.24
Note: a reduction factor may be applied to the Rv values for disconnected
surfaces, consult the BMP hydrology section
A
60. Water Quality Control Volume
Cover Type
Rv
Area (acres)
Flat roofs
0.87
1.6
Parking lots
0.98
8.8
Narrow streets
0.75
3.3
Silty soil
0.14
12.3
Rvi × Aci
WQv = ∑
×P=
Total Area
∑ ( .87 × 1.6 + .98 × 8.8 + .75 × 3.3 + .14 × 12.3) × 1.37 = 0.749in
26
A
61. Water Quality Storage Volume
Convert WQv from inches to ac-ft by converting
inches to feet and multiplying by the tributary
area
= (0.749in)*(1ft/12in)*26ac
A
63. Permanent Pool
Average pool depth 4 to
6 feet (not to exceed
12 feet)
A portion of the pool
must be at least 10 feet
if the pool is to contain
fish
At least 5.5 acres of
tributary area per ac-ft
of permanent pool
At least 10.3 acres of
tributary area per acre
of pool surface area
14 day residence time
A
64. Permanent Pool Volume (Pv)
Method 1
Based on the time required for algae to uptake
sufficient phosphorous
VP1 = (C * AT * R14) / 12
C = Runoff coefficient = 0.3 +0.6*I or APWA
section 5602.3
I = Fraction of impervious area
R14 = 14-day wet season rainfall
At = total tributary acreage
A
65. Permanent Pool Volume (Pv)
Method 2
Based on the time required for suspended
solids to settle
VP2 = (VB/VR * SD * Ai) / 12
VB/VR = ratio of design water quality volume
to runoff volume (should be at least 4 for
adequate TSS removal)
SD = mean storm depth
Ai = impervious tributary acreage
A
66. Permanent Pool Volume (Pv)
Method 1
Kansas City
From APWA section 5602.3
= 0.3+0.6*.53
= (0.6*26*2.2)/12
A
68. Permanent Pool Volume (Pv)
Method 2
5.0
Kansas City
0.6
13.7
= (5.0*0.6*13.7)/12
3.43
Correction: Step 1 should refer to Figure 24
A
69. Permanent Pool Volume (Pv)
= 3.43*1.20
1.
2.
3.
Use the larger volume calculated in the
previous steps and add 20% for sedimentation
Average pool depth: 4 to 6ft
Surface area = VP / ZP
A
71. Outlet Structure
Outlet sized to release
WQv (ac-ft) within 40
hours
Locate outlet as far
away from inlet as
possible
Avoid short-circuiting
The facility must
bypass 1% storm event
Provide at least 1ft of
freeboard above WQV
stage
A
73. Single Orifice Outlet
i.
Depth of water quality volume at outlet (ZWQ)
ZWQ = 3 feet
ii.
Average head of WQv over invert of orifice,
HWQ (ft)
HWQ = 0.5*ZWQ
iii.
Average water quality outflow rate, QWQ (cfs)
QWQ = (WQV * 43,560) / (40 * 3,600)
A
75. Single Orifice Outlet
iv. Set orifice coefficient
(Co) depending on
orifice plate thickness
u
u
u
Do must be greater than
4 inches in the following
step
C0 = 0.66 if plate
thickness is Do
C0 = 0.80 if Do
A
76. Single Orifice Outlet
v.
Orifice diameter (Do) must be greater than 4
inches, otherwise use weir or riser
Do = 12 * 2 * QWQ / Co * π *
(
2 * g * HWQ
)
g=32.2 ft/sec2
π = 3.14
A
80. Perforated Riser or Plate
Outlet
Calculate outlet area per row of
perforations (Ao)
Ao (in2) = WQv / (0.013 * ZWQ2 + 0.22 * ZWQ – 0.1)
Assuming a single column, calculate
the diameter of a single perforation for
each row
D1 = (4 * Ao / π)1/2
If D1 is greater than 2 inches add more
columns
nc = 4
A
81. Perforated Riser or Plate
Outlet
3.0
2.4
= 1.62/(0.013*3.02+0.22*3.0–0.1)
1.75
= (4*2.4/π)1/2
1
1.75
NA
9
A
82. Perforated Riser or Plate
Outlet
Use number of columns to determine exact
perforation diameter
Dperf = (4 / π * Ao / nc)1/2
Using a 4” center to center vertical spacing
and ZWQ, determine number of rows (nv)
nv = ZWQ / 4
nv = 5
A
83. Perforated Riser or Plate
Outlet
3.0
2.4
= 1.62/(0.013*3.02+0.22*3.0–0.1)
1.75
= (4*2.4/π)1/2
1
1.75
= (4/π*2.4/1)1/2
= (ZWQ*12in)/4
NA
9
A
86. V-Notch Weir Outlet
Calculate required v-notch weir angle
(calculator in radians)
θ = 2 * (180 / π) * arctan (QWQ/(Cv * HWQ5/2))
CV = V-notch weir coefficient = 2.5
If calculator is set to degrees use
θ = 2* arctan (QWQ/(Cv * HWQ5/2))
θ
Source: Hubbard Brook
LTER
A
87. V-Notch Weir Outlet
If θ is 20º set θ to 20º
Calculate top width of v-notch weir
(WV)
θ
Wv = 2 * ZWQ * Tan (θ / 2)
Source: Hubbard Brook
LTER
A
88. V-Notch Weir Outlet
= 2*(180/π)*arctan(0.49/(2.5*1.55/2))
= 2*3.0*tan(8º/2)
Since θ 20º set θ to 20º
A
91. Forebay
Volume (VolFB) should be at least 10% of WQv
Depth (ZFB) should be at least 3feet
Sides and bottom paved or hardened
Surface area (AFB):
AFB = VolFB / ZFB
A
93. Littoral Bench
Serves as a planting
surface and safety
feature around
perimeter of permanent
pool
25% to 50% of
permanent pool
surface area
At least 10 feet wide
with a max slope of 6:1
6 to 12 inches below
permanent pool water
surface
A
94. Littoral Bench
Width of Littoral Bench (WLB):
WLB
A LB ( 43,560 )
=
A Pool ( 43,560 )
2π
π
A
96. Vegetation
Plant berms and
sloped areas with
native grasses
Littoral bench should
be planted with native
wetland species
Plant trees and shrubs
around perimeter of
site
Appendix A in BMP
manual
A
98. Extended Detention Wetland
Key Design Features
Permanent
pool
Low marsh
High marsh
Forebay
Micropool
Outlet structure
Water budget
Wetland shape
A
99. Extended Detention Wetland
Permanent Pool Volume
Use Method 1 or Method 2 – same as in Extended
Wet Detention Basin Design
Choose larger volume as permanent pool volume.
A
104. EDW Forebay
Use VForebay from step II and SAForebay from step III to
find forebay depth (ZForebay)
ZForebay = VForebay/SAForebay
Depth should be 4-6feet
A
107. EDW Micropool
Using the same method used to calculate the
forebay:
ZMicropool = VMicropool/SAMicrpool
Depth should be 4 to 6 feet
Safety bench should be ≥ 12 feet
A
108. EDW
Water Quality Outlet
Depth of water quality volume above permanent
pool
Consider survivability of plant species
Maximum depth should be 2 feet or less
Single Orifice, Orifice Plate or Standpipe, and Vnotch outlet examples in Manual
Sized for 40 hour drawdown
A
109. Shape
Flowpath length (L) to permanent pool width (W)
ratio must be greater than 3:1
Place berms or high marsh wedges at 50-foot
intervals perpendicular to the flow direction to
increase dry weather flowpath length
Wedge-shaped, narrowest at the inlet and widest
at the outlet
L
W
A
110. Vegetation
Wetland vegetation should occupy 50-75% of surface
area
Develop a landscaping plan, which places appropriate
species in each EDW zone and the surrounding area
For plantings, use soil from an existing wetland or a
designed wetland planting mix
Kansas City, MO
A
113. Activity
Design an extended wet detention basin to capture
runoff from a 42 acre drainage area with mixed land
use. Size the permanent pool and WQv of the basin
using a v-notch outlet structure that will release the
WQv over a period of 40 hours.
A
118. Vegetation
Use plants listed in the BMP Manual Appendix A
“Recommended Plant Materials for BMPs”
Narrow down from this list by:
Treatment only, habitat creation / biodiversity,
aesthetics?
• If treatment is most important, then a wetland seed
mix may be sufficient.
• If habitat creation and biodiversity is desired, specific
species with habitat benefits are recommended
Evaluating site conditions - soil quality, climate,
wetness, pollution
• Hardier plants would work better in areas with poorer
site conditions
A
119. Vegetation
Narrow down from this list by (cont):
Speaking with local nursery or botanists
•
•
•
What plants are available for purchase?
Which plants have the best survivability?
Which plants would be best candidates for wet areas,
variable moisture, poor soils, etc.?
Visit at natural wetland in the area
• What plants are naturally favored in local area?
• Are there specific invasive species that need to be
managed?
Check municipal codes to ensure all plant materials
are approved for the area
A
123. Native versus Non-native
Plants
Native plants are
recommended
Larger root system
Increase infiltration
More drought
tolerant
Disease resistant
Adapted to
environment
A
124. Native Plants-Advantages and
Disadvantages
Advantages
Indigenous to the area and able to thrive in the local climate with
less maintenance.
Deep roots enhance stormwater infiltration into the soil.
Able to withstand flooding events as well as extended dry
periods.
Reduces flow velocity of stormwater runoff.
Wide range of application (restoration of native prairie, woodland,
wetlands, riparian areas)
Attracts wildlife and improves biological diversity.
Requires little to no fertilizer or chemical maintenance
Requires less water to survive.
Provides attractive and natural vegetative scenery.
Disadvantages
Can be difficult to establish if some circumstances.
Can be expenses if planted from nursery stock plugs.
Can be considered “weedy” by some people.
A
125. Vegetation – Design
Consideration
Local and regional planning initiatives
Public involvement/public relations
Visibility-Aesthetics
Height of vegetation
Financial (funding source, budget, property values)
Regulatory requirements
Function/risk
Utility-stormwater management
Recreation
A
127. Other Sources
Tallgrass Restoration Handbook for Prairies Savannas and
Woodlands (Packard Mutel, 1997)
The National List of Plant Species that Occur in WetlandsRegion 3 (USFWS, 1988)
The Flora of Missouri (Steyermark, 1963; 1996)
Steyermark’s Flora of Missouri, Volume I, II,…; Yatskeievych;
1999…)
The Flora of the Great Plains (McGregor et. al.)
Ecologist; Landscape Architect
A
129. Vegetation – Other Design
Consideration
Setting
Built Environment
Urban
Rural
Commercial
Residential
Mixed Use
Stormwater Utility – Stormwater Management
Recreation
CONTEXT
A
130. Vegetation – Installation
Maintenance
Installation
Oversight
Contractor Experience
Plant availability
Maintenance Measures
Has a maintenance program/budget been established?
What type of adaptive management will be implemented?
• Burning or mowing
• Herbicides
• Transplanting
Who will do the management-establishment?
• Lawn maintenance crews
• Native Landscape specialists
A
131. General Maintenance
Event Inspection ( 0.5 inches)
Inspect facility operation, especially outlet structure
Remove trash debris
Document potential problems
Monthly Inspection
Inspect repair erosion
Water plant material during dry periods (1st Year)
Perform routine plant maintenance (pruning, weeding, etc.)
Semi-Annual Inspection
Remove and replace dead or diseased vegetation
Re-landscape/re-mulch any area areas
Annual Inspection
Inspect inlet outlet structure condition
Record assessment of planted species evidence of invasive
plant species
A
Perform comprehensive safety inspection
132. Other Maintenance
Consideration
Maintenance access - 15
feet wide strip around
the perimeter of the site
May need to harvest
excess plants
Erosion issues
Sediment removal from
forebay when 50% full
Sediment removal from
micropool and marsh
area when 10 to 15% full
A
133. Designer
Review Team
Planning Phase
– Environmental Site
Assessment
– Select Post
Construction BMPs
– Flood Control Study
– Establish Long-term
Maintenance Agreements
Plat
Approval
Planning
Engineering
Parks Recreation
Environmental Specialists
Attorney
Design Phase
– Erosion and
sedimentation
controls
– Post-construction
BMPs
– Flood control
improvements
Building
Permit
Review Team
Planning
Engineering
Code Compliance
Inspectors
Review Team
Planning
Engineering
Parks Recreation
Environmental Specialists
Operations Maintenance
Construction Phase
– Inspect and maintain
BMPs for construction
activities
– Construct Post
Construction BMPs
– Maintain agreements for
post-construction BMPs
Occupancy
Permit
Best Management Practices (BMPs) is a familiar term we use when talking about water quality, NPDES Phase II permits, and education to the public. We all have are own understanding of the term and use it maybe more than we should and too often forget the true meaning and intent of the acronym. The action word in the acronym is PRACTICE. Practice if you go to a dictionary is defined as to carry out, apply, or to do or perform often. Therefore what should w carry out regularly (often) to improvement water quality in our region? This and other BMP manuals often focus on the actions that are BEST not the ones that should be perform regularly. Therefore this primer is a discussion on what we should do regularly to improve water quality. Other items in this manual will focus on specific structural practices that can be implement for a specific site. This section will focus on regular practices that should be consider as key part in a stormwater management program to improve water quality.
Add pic of wqv
Add a pic or figure of settling cross-section
Picture
Picture
Split up and use same figures as eddb
Picture
Changed tile from “Extended wet detention BMPs”
Bad standing water pic
Pic of dead plants or dry basin
PIC
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Added method description
Added method description
Changed fish statement
Changed fish statement
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Same as single orifice
Same as single orifice
For larger Zwq values the angle is over the table, the angle doesn’t change that much with the range of Cv values
For larger Zwq values the angle is over the table, the angle doesn’t change that much with the range of Cv values