Choosing The Right Stp

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  • This presentation presents a series of matrices that can be used as a screening process for selecting the best STP or group of STPs for a development site. It also provides guidance for locating practices on the site.
  • Choosing The Right Stp

    1. 1. Selecting the Most Effective Stormwater Treatment Practice Presented by the Center for Watershed Protection
    2. 2. Seven-Step Process to STP Screening <ul><li>Land Use </li></ul><ul><li>Physical Feasibility </li></ul><ul><li>Climate/ Regional Factors </li></ul><ul><li>Watershed Factors </li></ul><ul><li>Stormwater Management Capability </li></ul><ul><li>Pollutant Removal </li></ul><ul><li>Community and Environmental Factors </li></ul>
    3. 3. Customizing Matrices to Local Needs <ul><li>Matrices are not necessarily exhaustive. </li></ul><ul><li>Specific additional criteria may be incorporated or removed depending on local goals. </li></ul><ul><li>Most of the material in the screening matrices provides technical guidance, and is not necessarily a regulatory mandate. </li></ul>
    4. 4. Step 1. Land Use <ul><li>Rural —STPs for low density areas </li></ul><ul><li>Residential —STPs for med. to high density residential </li></ul><ul><li>Roads & Highways —STPs for major roads Commercial— STPs suitable for new commercial areas </li></ul><ul><li>Hotspot Land Uses— STPs for high risk areas </li></ul><ul><li>Ultra-Urban Sites— STPs for space-limited areas </li></ul>Step 1 Matrix
    5. 5. Step 2. Physical Feasibility <ul><li>Soils </li></ul><ul><li>Water Table </li></ul><ul><li>Drainage Area </li></ul><ul><li>Slope </li></ul><ul><li>Head </li></ul>Step 2 Matrix
    6. 6. Step 3. Climate and Regional Factors <ul><li>Arid/Semi-arid </li></ul><ul><li>Low Relief </li></ul><ul><li>Cold Climates </li></ul><ul><li>Karst Topography </li></ul><ul><li>High Rainfall </li></ul>Step 3 Matrix
    7. 7. Step 4. Watershed Factors <ul><li>Considerations for the following resource categories: </li></ul><ul><li>Sensitive Streams </li></ul><ul><li>Impacted Streams </li></ul><ul><li>Non-Supporting Streams </li></ul><ul><li>Restorable Streams </li></ul><ul><li>Aquifers </li></ul><ul><li>Urban Lakes </li></ul><ul><li>Reservoirs </li></ul><ul><li>Estuaries/ Shellfish Beds </li></ul>Step 4.2 Matrix Step 4.1 Matrix
    8. 8. Step 5. Stormwater Management Capability <ul><li>Water Quality </li></ul><ul><li>Recharge </li></ul><ul><li>Channel Protection </li></ul><ul><li>Quantity Control </li></ul>Step 5 Matrix
    9. 9. Step 6. Pollutant Removal <ul><li>Pollutant data assessed include: </li></ul><ul><li>Total Suspended Solids </li></ul><ul><li>Total Phosphorous </li></ul><ul><li>Total Nitrogen </li></ul><ul><li>Metals </li></ul><ul><li>Bacteria </li></ul>Step 6 Matrix
    10. 10. Step 7. Community and Environmental Factors <ul><li>Maintenance </li></ul><ul><li>Community Acceptance </li></ul><ul><li>Affordability </li></ul><ul><li>Safety </li></ul><ul><li>Habitat </li></ul>Step 7 Matrix

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