The main goal of the project was to develop a GIS model that provides a analysis matrix that gives the risk exposure from natural hazards for the cultural resources within the Snoqualmie river floodplain.
The goal for pro-poor mitigation activity, is to develop a low-cost protocol to quantify greenhouse gas emissions and to identify mitigation options for smallholders at whole-farm and landscape levels. Learn more: www.ccafs.cgiar.org
This document provides an overview of dam safety efforts in Delaware. It discusses the evolution of dam safety regulations and programs in DE from the 1970s to present. It outlines the current prioritization process used by DelDOT to evaluate state-owned dams. It also describes the ongoing dam preservation program through the DNREC/DelDOT partnership, including data collection and analysis, modeling approaches, and planned upgrading projects. It highlights a computational fluid dynamics pilot project conducted for Silver Lake Dam that refined the spillway capacity and breach analyses.
HEC-GeoRAS is an ArcGIS extension that allows users to develop geometric data from geospatial datasets for import into HEC-RAS for hydraulic modeling. It extracts cross sections, river centerlines, and other data from a digital terrain model and GIS layers. After a HEC-RAS simulation, results like water surface profiles can be imported back into GIS for mapping flood inundation and other outputs. The document provides an overview of HEC-GeoRAS capabilities and requirements.
A description of some of the water and storm modeling tools in Civil 3D. This was a specialized presentation, so the slide background was scrubbed out and a standard design used in its place.
This document summarizes a presentation on using GIS and GPS technologies for civil engineering applications. It describes using ArcMap and HEC-RAS software to create hydraulic models of Walnut Creek in San Dimas, CA to analyze flood risks. Cross section and flow data were collected using GPS and analyzed in HEC-RAS. Results were imported back into GIS. Two conceptual bank stabilization measures, riprap and bendway weirs, were proposed to mitigate erosion issues found at one location along the creek.
In the past decade Brays Bayou has flooded several times due to massive peak flows and urban stormwater runoff. The increase in volume of runoff can be attributed to both increased urbanization and changing weather patterns. However, as flooding issues continue to worsen along the Bayou and are especially dangerous in vulnerable areas such as the Texas Medical Center, this project seeks to redesign the portion of the Bayou between Fannin Street and Main Street in order to mitigate the flood threat. In the early 2000s, the U.S. Army Corps of Engineers (USACE) and the Harris County Flood Control District (HCFCD) launched Project Brays, which outlined specifications for the redevelopment of the entire Bayou. One goal of this project is to design improvements that meet the specifications outlined by USACE and HCFCD. The development of the Bayou will consider increased stormwater flow due to the construction of a new hotel on Main St., and will require close coordination with the developers of the new 7200 Main Street Hotel. The area between the hotel and Bayou will be designed with guest amenities such as trails, terraces, access points, trees, and landscaping. In addition, this project will redesign the Greenbriar Bridge between Braeswood Boulevard and Main Street in order to reduce its backwater effect on the Bayou and ensure that it abides by the elevation specifications mandated by Harris County.
River hydraulic modelling for river Serio (Northern Italy), 2014Alireza Babaee
Presentation of project in the course "River Hydraulic for Flood Risk Evaluation" for M.Sc. "Civil Engineering for Risk Mitigation" at Politecnico di Milano.
Submitted by:
Alireza Babaee, Maryam Izadifar, Ahmed El-Banna, Budiwan Adi Tirta, Svilen Zlatev
Submitted to:
Professor Alessio Radice
This document describes applying 1D and 2D hydraulic modeling to analyze a split flow loop network using HEC-RAS 5.0 Beta software. It first created a 1D steady-state model with multiple reaches and junctions to represent the loop network. It then modeled the system using a combined 1D/2D approach with 2D flow areas defined from LiDAR terrain data. The document discusses challenges of split flow modeling and benefits of the 2D approach for variable water surface elevations. It also demonstrates particle tracking visualization to analyze flow paths through the floodplain during large events.
The goal for pro-poor mitigation activity, is to develop a low-cost protocol to quantify greenhouse gas emissions and to identify mitigation options for smallholders at whole-farm and landscape levels. Learn more: www.ccafs.cgiar.org
This document provides an overview of dam safety efforts in Delaware. It discusses the evolution of dam safety regulations and programs in DE from the 1970s to present. It outlines the current prioritization process used by DelDOT to evaluate state-owned dams. It also describes the ongoing dam preservation program through the DNREC/DelDOT partnership, including data collection and analysis, modeling approaches, and planned upgrading projects. It highlights a computational fluid dynamics pilot project conducted for Silver Lake Dam that refined the spillway capacity and breach analyses.
HEC-GeoRAS is an ArcGIS extension that allows users to develop geometric data from geospatial datasets for import into HEC-RAS for hydraulic modeling. It extracts cross sections, river centerlines, and other data from a digital terrain model and GIS layers. After a HEC-RAS simulation, results like water surface profiles can be imported back into GIS for mapping flood inundation and other outputs. The document provides an overview of HEC-GeoRAS capabilities and requirements.
A description of some of the water and storm modeling tools in Civil 3D. This was a specialized presentation, so the slide background was scrubbed out and a standard design used in its place.
This document summarizes a presentation on using GIS and GPS technologies for civil engineering applications. It describes using ArcMap and HEC-RAS software to create hydraulic models of Walnut Creek in San Dimas, CA to analyze flood risks. Cross section and flow data were collected using GPS and analyzed in HEC-RAS. Results were imported back into GIS. Two conceptual bank stabilization measures, riprap and bendway weirs, were proposed to mitigate erosion issues found at one location along the creek.
In the past decade Brays Bayou has flooded several times due to massive peak flows and urban stormwater runoff. The increase in volume of runoff can be attributed to both increased urbanization and changing weather patterns. However, as flooding issues continue to worsen along the Bayou and are especially dangerous in vulnerable areas such as the Texas Medical Center, this project seeks to redesign the portion of the Bayou between Fannin Street and Main Street in order to mitigate the flood threat. In the early 2000s, the U.S. Army Corps of Engineers (USACE) and the Harris County Flood Control District (HCFCD) launched Project Brays, which outlined specifications for the redevelopment of the entire Bayou. One goal of this project is to design improvements that meet the specifications outlined by USACE and HCFCD. The development of the Bayou will consider increased stormwater flow due to the construction of a new hotel on Main St., and will require close coordination with the developers of the new 7200 Main Street Hotel. The area between the hotel and Bayou will be designed with guest amenities such as trails, terraces, access points, trees, and landscaping. In addition, this project will redesign the Greenbriar Bridge between Braeswood Boulevard and Main Street in order to reduce its backwater effect on the Bayou and ensure that it abides by the elevation specifications mandated by Harris County.
River hydraulic modelling for river Serio (Northern Italy), 2014Alireza Babaee
Presentation of project in the course "River Hydraulic for Flood Risk Evaluation" for M.Sc. "Civil Engineering for Risk Mitigation" at Politecnico di Milano.
Submitted by:
Alireza Babaee, Maryam Izadifar, Ahmed El-Banna, Budiwan Adi Tirta, Svilen Zlatev
Submitted to:
Professor Alessio Radice
This document describes applying 1D and 2D hydraulic modeling to analyze a split flow loop network using HEC-RAS 5.0 Beta software. It first created a 1D steady-state model with multiple reaches and junctions to represent the loop network. It then modeled the system using a combined 1D/2D approach with 2D flow areas defined from LiDAR terrain data. The document discusses challenges of split flow modeling and benefits of the 2D approach for variable water surface elevations. It also demonstrates particle tracking visualization to analyze flow paths through the floodplain during large events.
- The document summarizes modeling work done in the Choptank Watershed using the Hydrologic Simulation Program – Fortran (HSPF) and Generalized Water Loading Function (GWLF) models previously, as well as new modeling approaches.
- The new approach uses high resolution multi-sensor precipitation estimates and a gridded, spatially-distributed hydrologic model called the Research Distributed Hydrologic Model (RDHM) to simulate runoff at a higher resolution.
- RDHM outputs will be used as inputs to the Hydraulic Engineering Center – River Analysis System (HEC-RAS) model to simulate flows and stages throughout the river network.
- The goals are to support fertil
The document discusses the process of creating a terrain model and delineating floodplains from LiDAR data using ArcGIS and HEC-GeoRAS/HEC-RAS software. Key steps include building a terrain from LiDAR point clouds, breaklines and other feature classes, converting the terrain to a raster, using HEC-GeoRAS to generate cross-section geometry from the raster for hydraulic modeling in HEC-RAS, and mapping floodplains back in GIS from HEC-RAS results. Issues like missing LiDAR data or incorrect elevations may require additional field surveying.
This document discusses techniques for delineating approximate floodplains, including using regional regression equations and hydrology/hydraulic models like HEC-RAS and HEC-GeoRAS. It also describes a case study on Ash Creek in Pennsylvania where these methods were used to define the 100-year floodplain by deriving peak flows, running HEC-RAS to get water surface elevations, and mapping the results in GIS with HEC-GeoRAS. The conclusions state that these techniques provide an expeditious way to preliminarily delineate floodplains in around 2 months.
ASFPM 2016: Applications of 2D Surface flow Modeling in the New HEC-RAS Versi...CDM Smith
Derek Etkin presented "Applications of 2D Surface flow Modeling in the New HEC-RAS Version 5.0" at the 2016 Association of State Floodplain Managers conference.
El documento describe los pasos iniciales para configurar y modelar un proyecto de HEC-RAS, incluyendo: 1) establecer las unidades y simbología decimal, 2) asignar un nombre al proyecto, 3) dibujar la geometría del cauce, 4) ingresar secciones transversales y datos de estructuras, y 5) definir las condiciones de contorno para el cálculo estacionario.
Workshop on Storm Water Modeling ApproachesM. Damon Weiss
The attached presentation was prepared by Pennoni Associates and Michael Baker Corporation to the Pittsburgh Parks Conservancy and members of the Pennsylvania Environmental Council Green Infrastructure Network. The presentation discussed various watershed modeling techniques for regional, watershed and local projects, as well as an overview of the different tools that engineers use to create these models.
This document provides an overview of a presentation on using the HEC-RAS hydraulic modeling software for managers. It discusses the benefits of understanding hydraulic modeling including for planning, risk reduction, and environmental assessments. It also outlines the agenda which will define key hydraulic and modeling concepts, explain what HEC-RAS is and what it can be used for, what is needed to use it, concerns for managers, and where to find help. The presentation will provide managers with a basic understanding of HEC-RAS and its uses.
This document provides an overview of a PhD dissertation defense presentation on incorporating stakeholder participation and climatic variability into flood risk management. The presentation covers:
1) Investigating and incorporating climate change into flood risk management processes and assessing risk using conventional and fuzzy logic methods.
2) Evaluating how to enhance stakeholder participation in developing management processes.
3) Developing a decision support system for managers using hydrological and social data from the Kalu-Ganga river basin in Sri Lanka, including estimating climate variability and assessing flood hazard, vulnerability and risk.
This document provides an overview of a workshop on using HEC-GeoRAS to link GIS and hydraulic modeling software. The workshop is aimed at engineers, GIS professionals, and planners. It introduces HEC-GeoRAS and HEC-RAS software, the process of generating spatial data in HEC-GeoRAS from GIS layers, importing it into HEC-RAS, and exporting modeling results for mapping floodplains in GIS. Key topics covered include developing stream centerlines, cross sections, flow paths, and other data layers in GIS, validating data, running hydraulic models in HEC-RAS, and mapping inundation polygons with HEC-GeoRAS.
This document discusses using HEC-RAS software to analyze a river reach containing a single bridge. It outlines the input data needed, including geometric data and flow data. It then describes the steps to model the bridge, including adding the bridge, defining the geometry, and selecting modeling approaches. The document compares results from modeling the bridge as a pressure/weir and using the energy method. It notes that adjustments to contraction/expansion coefficients and cross section locations can improve results.
The document discusses open channel flow, providing definitions and key equations. It begins by defining an open channel as a channel with a free surface not fully enclosed by solid boundaries. Important equations for open channel flow are then presented, including Chezy's and Manning's equations for calculating velocity and discharge using variables like hydraulic radius, channel slope, and roughness coefficients. Factors influencing open channel flow like channel shape, surface roughness, and flow regime (e.g. laminar vs turbulent) are also addressed.
Fluid MechanicsLosses in pipes dynamics of viscous flowsMohsin Siddique
This document discusses fluid flow in pipes. It defines the Reynolds number and explains laminar and turbulent flow regimes. It also covers the Darcy-Weisbach equation for calculating head losses due to pipe friction. The friction factor is determined using Moody diagrams based on Reynolds number and relative pipe roughness. Examples are provided to calculate friction factor, head loss, and flow rate for different pipe flow conditions.
This document discusses buoyancy, floatation, and the equilibrium of submerged and floating bodies. It defines buoyancy as the upward force that opposes gravity when an object is immersed in a fluid. Archimedes' principle states that the buoyant force is equal to the weight of the fluid displaced by the object. The point where the buoyant force is applied is called the center of buoyancy. For a floating body to be in stable equilibrium, the metacenter must be above the center of gravity. The distance between these two points is called the metacentric height.
This document discusses open channel hydraulics and specific energy. It defines key terms like head, energy, hydraulic grade line, energy line, critical depth, Froude number, specific energy, and gradually varied flow. It explains the concepts of critical depth, alternate depths, and how specific energy relates to critical depth for rectangular and non-rectangular channels. It also discusses surface profiles, backwater curves, types of bed slopes, occurrence of critical depth with changes in bed slope, and the energy equation for gradually varied flow. An example problem is included to demonstrate calculating distance between depths for gradually varied flow.
- The document summarizes modeling work done in the Choptank Watershed using the Hydrologic Simulation Program – Fortran (HSPF) and Generalized Water Loading Function (GWLF) models previously, as well as new modeling approaches.
- The new approach uses high resolution multi-sensor precipitation estimates and a gridded, spatially-distributed hydrologic model called the Research Distributed Hydrologic Model (RDHM) to simulate runoff at a higher resolution.
- RDHM outputs will be used as inputs to the Hydraulic Engineering Center – River Analysis System (HEC-RAS) model to simulate flows and stages throughout the river network.
- The goals are to support fertil
The document discusses the process of creating a terrain model and delineating floodplains from LiDAR data using ArcGIS and HEC-GeoRAS/HEC-RAS software. Key steps include building a terrain from LiDAR point clouds, breaklines and other feature classes, converting the terrain to a raster, using HEC-GeoRAS to generate cross-section geometry from the raster for hydraulic modeling in HEC-RAS, and mapping floodplains back in GIS from HEC-RAS results. Issues like missing LiDAR data or incorrect elevations may require additional field surveying.
This document discusses techniques for delineating approximate floodplains, including using regional regression equations and hydrology/hydraulic models like HEC-RAS and HEC-GeoRAS. It also describes a case study on Ash Creek in Pennsylvania where these methods were used to define the 100-year floodplain by deriving peak flows, running HEC-RAS to get water surface elevations, and mapping the results in GIS with HEC-GeoRAS. The conclusions state that these techniques provide an expeditious way to preliminarily delineate floodplains in around 2 months.
ASFPM 2016: Applications of 2D Surface flow Modeling in the New HEC-RAS Versi...CDM Smith
Derek Etkin presented "Applications of 2D Surface flow Modeling in the New HEC-RAS Version 5.0" at the 2016 Association of State Floodplain Managers conference.
El documento describe los pasos iniciales para configurar y modelar un proyecto de HEC-RAS, incluyendo: 1) establecer las unidades y simbología decimal, 2) asignar un nombre al proyecto, 3) dibujar la geometría del cauce, 4) ingresar secciones transversales y datos de estructuras, y 5) definir las condiciones de contorno para el cálculo estacionario.
Workshop on Storm Water Modeling ApproachesM. Damon Weiss
The attached presentation was prepared by Pennoni Associates and Michael Baker Corporation to the Pittsburgh Parks Conservancy and members of the Pennsylvania Environmental Council Green Infrastructure Network. The presentation discussed various watershed modeling techniques for regional, watershed and local projects, as well as an overview of the different tools that engineers use to create these models.
This document provides an overview of a presentation on using the HEC-RAS hydraulic modeling software for managers. It discusses the benefits of understanding hydraulic modeling including for planning, risk reduction, and environmental assessments. It also outlines the agenda which will define key hydraulic and modeling concepts, explain what HEC-RAS is and what it can be used for, what is needed to use it, concerns for managers, and where to find help. The presentation will provide managers with a basic understanding of HEC-RAS and its uses.
This document provides an overview of a PhD dissertation defense presentation on incorporating stakeholder participation and climatic variability into flood risk management. The presentation covers:
1) Investigating and incorporating climate change into flood risk management processes and assessing risk using conventional and fuzzy logic methods.
2) Evaluating how to enhance stakeholder participation in developing management processes.
3) Developing a decision support system for managers using hydrological and social data from the Kalu-Ganga river basin in Sri Lanka, including estimating climate variability and assessing flood hazard, vulnerability and risk.
This document provides an overview of a workshop on using HEC-GeoRAS to link GIS and hydraulic modeling software. The workshop is aimed at engineers, GIS professionals, and planners. It introduces HEC-GeoRAS and HEC-RAS software, the process of generating spatial data in HEC-GeoRAS from GIS layers, importing it into HEC-RAS, and exporting modeling results for mapping floodplains in GIS. Key topics covered include developing stream centerlines, cross sections, flow paths, and other data layers in GIS, validating data, running hydraulic models in HEC-RAS, and mapping inundation polygons with HEC-GeoRAS.
This document discusses using HEC-RAS software to analyze a river reach containing a single bridge. It outlines the input data needed, including geometric data and flow data. It then describes the steps to model the bridge, including adding the bridge, defining the geometry, and selecting modeling approaches. The document compares results from modeling the bridge as a pressure/weir and using the energy method. It notes that adjustments to contraction/expansion coefficients and cross section locations can improve results.
The document discusses open channel flow, providing definitions and key equations. It begins by defining an open channel as a channel with a free surface not fully enclosed by solid boundaries. Important equations for open channel flow are then presented, including Chezy's and Manning's equations for calculating velocity and discharge using variables like hydraulic radius, channel slope, and roughness coefficients. Factors influencing open channel flow like channel shape, surface roughness, and flow regime (e.g. laminar vs turbulent) are also addressed.
Fluid MechanicsLosses in pipes dynamics of viscous flowsMohsin Siddique
This document discusses fluid flow in pipes. It defines the Reynolds number and explains laminar and turbulent flow regimes. It also covers the Darcy-Weisbach equation for calculating head losses due to pipe friction. The friction factor is determined using Moody diagrams based on Reynolds number and relative pipe roughness. Examples are provided to calculate friction factor, head loss, and flow rate for different pipe flow conditions.
This document discusses buoyancy, floatation, and the equilibrium of submerged and floating bodies. It defines buoyancy as the upward force that opposes gravity when an object is immersed in a fluid. Archimedes' principle states that the buoyant force is equal to the weight of the fluid displaced by the object. The point where the buoyant force is applied is called the center of buoyancy. For a floating body to be in stable equilibrium, the metacenter must be above the center of gravity. The distance between these two points is called the metacentric height.
This document discusses open channel hydraulics and specific energy. It defines key terms like head, energy, hydraulic grade line, energy line, critical depth, Froude number, specific energy, and gradually varied flow. It explains the concepts of critical depth, alternate depths, and how specific energy relates to critical depth for rectangular and non-rectangular channels. It also discusses surface profiles, backwater curves, types of bed slopes, occurrence of critical depth with changes in bed slope, and the energy equation for gradually varied flow. An example problem is included to demonstrate calculating distance between depths for gradually varied flow.
Risk analysis for cultural resources within the floodplains of the Snoqualmie River
1. Risk Analysis of Cultural Resources within
Snoqualmie Flood Plains
GIS Project Presentation
For King County GIS User Group
10.07.09
Presented By
Odra Cardenas
Shweta Bhatia Gupta
A r c h i t e c t u r e | Te c h n o l o g y | C u l t u r e
2. “GIS as a technology in the heart of
preservation planning, community building,
and effective decision making”
3. The Project
Relation between land and cultural resource
Cultural resources are the buildings, sites, areas, architecture, and properties that bear
evidence of human activity and have a scientific, historic, and/or cultural importance.
Cultural resources help define human history, remind us of our interdependence
with the land, and show how cultures change over time.
Hence cultural resource itself embodies the three important aspects of GIS
-Knowledge( Read information)
-Location
-Time
King County cultural resources
• The County’s cultural resources include around 2000 inventory, local, state and landmark
structures.
• The Snoqualmie valley, is home to historical railroad and timber Industries
• It is also home to the largest agricultural heritage within King County. The valley was
originally settled by members of the Snoqualmie tribe, and one can find displays of its native
American roots through relics like totem poles and archeological sites.
4. Snoqualmie Site
Farmlands are one of the most important component
of the county's historic and cultural resources.
In the last 16 years, the Snoqualmie valley
has experienced four of the worst floods on record,
including November 06's record-breaking deluge.
Within the Snoqualmie River basin floodplain
there are a total of 1,880 parcels.
This is approximately 40 percent of the total number
of parcels within King Countys floodplains (4,738).
There are structures at risk from flooding on 867 of
these parcels. The depth of flooding varies depending
on location.
5. The Goal
• Evaluating use of GIS as documentation tool in historic preservation
• Evaluating use of GIS as analytical and decision making tool
• Its resources and limitations
6. Methodology
Resource Research Process Management
Identification
Actual project plan
Data Data Gathering Database
Accumulation Defining dataset design
Work breakdown
structure
Creating feature set
Digitization
Task Division
Defining Of Matrix Reclassification Monitoring the
process
Status reports
Work quality
Model Building Time schedule
Analysis Reporting
7. The Process
• Stage 1:
– Data Collection
– Data cleanup
– Digitization
• Stage 2:
– Risk Matrix
– Database Design
– Reclassification for analysis
• Stage 3:
– Structural Analysis
– Site Level Analysis
8. Stage 1- Data Collection and Digitization
The two main sets of data were the geographical data and information about the structures on
the properties under consideration.
The former was collected from various GIS data repository and the later from local Historical
Archives.
9. Stage 2- The Matrix
The analysis was based on a risk matrix prepared to calculate percentage contribution each of
the factors considered. These contributions were then ranked ranging from 1 to 5 denoting the
lowest to highest risk levels to have uniformity across the analysis.
10. Stage 2- Risk Percentages
Analysis 1 40 % Status
Structural Risk
25 % Structural Condition
Foundation Type 40%
Cladding Type 20 %
20 % Structural/Material Roof Type 20 %
Roof Material 20 %
10 % Architectural Style
Change in Use 40%
Accessibility 30 %
5 % Site Condition Extant 30 %
The percentage Analysis 2 20 % Site Slope
contributors were decided Site Risk
on discussions with 20 % Site Soil
heritage preservation
program coordinators of 15 % Flood Way
the King County office and
research on the behavior of 45 % Flood Elevation
system types and materials
11. Stage 2-Integrated GIS Model
Feature
Historic Architecture
Point Polygon
HistoricProperty HistStructure
Polygon Polygon Polygon
HistPropretyID
Polygon
HistDistrictID HistoricDistrict HistMunicipality HistPropretyID
HistMunicipleID HistPropPolygon Polygon HistStructureID
Characteristics Summary Historic DistrictID Characteristics Summary
CharacteristicDetail HistPropretyID Location Info HistPropretyID CharacteristicDetail
Characteristics
Object Polygon
Historic Element
Archaeological District
HistElementID
ArchPropertyID
HistPropretyID Point
Location Info
Element Name[n]
Characteristics Archaeological Property
Element Type
Characteristics
ArchPropertyID
Feature SmithsodianID
Point ArchDistrictID
¼ Mile grid
HistElemPoint Property Name
ArchSite Grid Location Info
HistElementID Characteristics Summary
HasSites
HistPropretyID CharacteristicDetail
Location Info SiteDetails
Polygon
Feature Polygon
HistElemPolygon
ArchProperty Polygon
HistElementID
ArchPropertyID
HistPropretyID
Location Info Archaeological Site
12. Stage 2- Project Data
Flood Data Set Contour Data Admin Data
Flood Plain 5ft Contour Historic Site Point
Flood Way 2ft Contour
Contour _ Merge Historic Site Structure
Water Bodies Parcel KC Flood Plain Raster
Contour TIN
Zoning
Result Raster Set
Flood Plain uni
Soil 15
Slope
Parcel Flood
Parcel Soil
Parcel Slope
Flood pl reclass
Soil reclass
General Analysis
Slope reclass
Parcel Analysis Final Result
Modelwoflood Analysis
Structure Analysis Zone st –Par
Zonal St- Min
Zonal St- Mean
Models
13. Stage 3- Analysis at Structure Level
Formula: with a consideration 1 as low risk and 5 as highest risk rank
Total Structural Risk(%)= 20% X (structure Condition Rank)
+ 15% X (Structural material and construction type Rank)
+ 45% (Status and Arc Style Rank)+ 20% (Structure related Site Condition)
14. Stage 3- Analysis at Site Level
Formula: With a consideration 1 as low risk and 5 as highest risk rank
Total Site Risk(%)= 20% X (Slope Rank)+ 20% X (Soil type Rank)
+ 40% (100 yrs flood plain )+ 15% (Flood Elevation)
17. Results
353
Snoqualmie Falls Lumber Mills
Year built: :1917
National Landmark registered
No of structures in site at risk : 17 out
of 22
Most endangered property according to
this study and at 88% of risk of flooding
18. Results
ITEM NAME NUMBER OF STR LOCATION RISK PERSENTAGE
1 Broadacre Farm 9 Carnation 70-78 %
2 Carnation Research Farm Historic District 16 Carnation 51-72 %
3 Curtis Link Farm 3 Carnation 48-53%
Fred Keller Barn
1
4 Carnation 36%
5 Hjertoos Farms 2 Carnation 66-68%
6 Charles Suvan & Louise 5 Duvall 29-47%
7 DeJong, Jerry Farm 12 Duvall 46-55%
8 Herman, Art and Letha Farm 5 Duvall 53-63%
9 John W. Platt Farm 4 Duvall 42-46%
10 Kosters Farm 9 Duvall 36-43%
11 Neilson Hay & Dairy Company 9 Duvall 39-53%
12 Old Rupard Place 9 Duvall 51-67%
13 Roetcisoender, James Farm 11 Duvall 47-59%
14 Roney Ranch 15 Duvall 56-63%
15 904 4 Duvall 74-81%
10
16 Sam and Marylin Rupard Farm/ Alder Grove Diary Duvall 43-55%
17 Stan Chapman Farm 8 Duvall 42-60%
18 Charles Jancke/Canine Country Club 9 Fall City 36-47%
19 Dale Brevick Residence 4 Fall City 33-37%
20 Donald Evans Farm 5 Fall City 47-48%
21 Fall City Hop Shed 1 Fall City 78%
22 Fred Keller Barn 9 Fall City 37-38%
23 Johnson House 2 Fall City 38-43%
24 Jubliee Farm 15 Fall City 37-52%
25 Mary Thompson Rental House 1 Fall City 57%
26 Residence 1 Fall City 55%
27 Stanley Little Residence 2 Fall City 52-55%
28 Thelma Hart House 1 Fall City 48%
15
29 Weyerhaeuser Company Snoqualmie Falls Plant Snoqualmie 69-82%
30 0739 42%
31 0716-1 42%
32 0717e 42%
33 0717d 42%
34 0717c 42%
35 0717a 42%
36 0902-3 42%
37 0902-4 42%
38 0902-2 42%
39 0902-5 43%
40 0902-1
23. Process- Flood information HEC RAS
TIN Flood elevation
Model developed by the US Corps of Engineers
Hydrologic Engineering Center (HEC)
River Analysis Systems (RAS)
Detailed survey information
Use of HEC RAS HEC1
Replicate information to verify data