Introduction to the Watershed

Transcription

1 Introduction to the Watershed Treatment Model (WTM) The Need There is no simple way to track the full range of management options in uran watersheds.

2 The Watershed Treatment Model De Caraco, Center for Watershed Protection Paula Smith, Monroe County DES

3 Aout the Center for Watershed Protection Non-profit 501(c)3, non-advocacy organization Work with watershed groups, local, l state, t and federal governments Provide tools communities need to protect streams, lakes, and rivers Over 20 staff in MD, VA, NY

4 What is the WTM? A simple, spreadsheet model for the rapid assessment of watershed treatment options Annual output Pollutant loads (ls/acre) Bacteria Loads (MPN/yr) Runoff Volume (acre-ft/yr)

5 WTM Terminology Primary Sources Secondary Sources Management Practices Discount Factors

6 Primary Sources Determined entirely from land use/cover Residential Commercial Industrial Forest Rural

7 Secondary Sources Cannot e calculated solely y land use Examples CSOs, SSOs Septic Systems Channel Erosion

8 Types of Management Practices Structural: ponds, swale, LID etc. Non-Structural: street sweeping, downspout disconnect, uffers Programmatic: lawn and pet waste education, etc

9 Discount Factors Ideal load reductions can rarely e achieved Lack of space Imperfect practice application Inaility of programs to e completely l effective Discount factors "discount" load reductions to account for less than perfect application of practices.

10 Example: Erosion and Sediment Control (ESC) Base Conditions Load from uncontrolled construction is 1000 l TSS/year Practices can achieve 70% effectiveness (ase efficiency), or 700 l/year

11 ESC Discount Factors BUT Only 80% of Sites are Regulated Down to 0.8*700, or 560 ls/year A comination of poor installation and maintenance reduces practice implementation/effectiveness y 25% Down to 0.75*560, or 420 ls/year

12 Key Updates in the 2010 WTM Evaluates turf and septic systems in more detail Runoff is ased on oth pervious and impervious surfaces More user input guidance on-screen More detailed reakdown of surface/susurface flows Revised estimates for enefits e of septic systems, lawn care, and stormwater retrofit practices

13 A Few WTM Details Model Structure Some Data Entry Tips and Rules Ongoing WTM Updates The (Tasmanian) Devil s ( ) in the Details

14 Step 1. Calculate Existing Pollutant Loads Primary Sources + Secondary Sources - Existing Management Practices = Existing Loads Step 2. Apply Future Management Practices Future Existing Management = Loads - Practices Loads with Future Management Practices Retrofit Worksheet Stream Restoration ti Worksheet Step 3. Account for Future Growth Loads with Future Management Practices + New Development = Loads with Future Growth Future Land Use

15 Spreadsheet Tas Step 1: Step 2: 1a. Primary Sources 2a. Future Management 1. Secondary Sources Practices 1c. Existing Management 2. Retrofit Worksheet Practices 2c. Stream Restoration 1d. Existing Loads Worksheet 2c. Load with Future Management Practices Step 3: 3a. Future Land Use 3. New Development 3c. Loads With Future Growth

16 Data Entry: The WTM is Color- Coded! d! Green (Cells and Tas) require user input Blue Cells are defaults the user can override Grey Cells should not e modified Purple (Cells and Tas) represent Final Outputs Pet Waste Education Program in Place? yes no Both # of dwelling units Enter 0Value Fraction of Households with a Dog 40% Owners who Walk their Dogs (fraction) 50% Owners who Clean Up (fraction) 60% Fraction willing to change ehavior 60% Awareness of Message (Fraction of Population) Enter 0% Value Use Local Data if Availale

17 Data Entry: Pay Attention to Pop Up Guidance

18 A Few Data Entry Tips Keep a copy of the original (unmodified) for future watershed plans. At cells with a pull-down menu, you cannot override the options. Make sure you scroll over completely. l On some screens (especially the Retrofit Worksheet), data entry cells may not e visile immediately.

19 Assessing Restoration Potential in Shipuilders Creek Monroe County NY

20 Lake OntarioShipuilders ild Creek Watershed Rochester Watersheds In Monroe County NY

21 Data Sources -GIS

22 Data Sources USGS Watersheds

23 Uran Storm Sewershed

24 Land Use Export GIS parcel data and sort y property class

25 Data Sources Soils

26 Data Sources Maple

27 Data Sources Land Cover Suwatershed D Water 2.38% Forest 30.67% Wetland 1.22% Impervious 17.49% Grass 17.02% Agriculture 24.71% Bare Earth 6.52% Total Percent %

28 Woodhull Orchard Hard Shoecraft Hatch Marchner criner Allen Woodhull Construction Sites Shoemaker Pellett Herman Van Alstyne Baker Lake Ontario ^_^_ ^_ Drumm ^_^_ Vosurg Adams Backus ^_ ^_ ^_ ^_^_ ^_ ^_ ^_ ^_ ^_^_ ^_^_ ^_ ^_ Maple ^_ ^_ ^_ ^_ ^_ ^_ Ridge ^_ ^_^_ ^ ^ ^_^_ Seneca Volk Dewitt Inspiration Point Dickinson Bay Shore Bay View Helendale Ridge

29 Hard Shoecraft criner Hatch Woodhull Woodhull Su-Watershed Percent Impervious Cover Pellett Shoemaker Herman Van Alstyne Orchard Baker Drumm Maple Vosurg Adams Backus Dewitt Dickinson Lake Ontario Marchner Allen Ridge 24 Seneca Volk Inspiration Point Bay Shore Bay View Ridge Helendale

30 Woodhull Orchard Hard hoecraft Hatch Marchner S Septic Parcels Shoemaker Pellett Herman Van Alstyn ne Bake er Drumm Ridge Maple Vosurg Adams Backus kus Seneca Volk Dew witt ation Point Inspiration Dickinson Bay Shore Bay View Helendale Ridge

31 Woodhull Orchard Hard hoecraft Hatch Marchner S Outfalls Shoemaker Pellett Bake er Vosurg Herman Adams Drumm Van Alstyn ne Backus kus Maple Ridge Seneca Volk Dew witt ation Point Inspiration Dickinson Bay Shore Bay View Helendale Ridge

32 Tracking Pollutants of Concern Stream impacts from uran land use and channelization Upland contriutions from hotspots and large impervious areas

33 Summary of Existing Loads TN TP TSS Fecal Coliform l/year l/year l/year illion/year Runoff Volume (acrefeet/year) Uran Land 25,811 5, , ,525 47,718 Active Construction , SSOs , ,960 - Illicit Discharges , ,238 - Channel Erosion , Rural Land 1, ,902 22, Livestock ,600 - Open Water ,325 - Total 29,617 6, , ,484,257 47,841

34 Hard Shoecraft Hatch criner Woodhull Woodhull Stream and Stormwater Retrofit Locations Shoemaker Orchard Pellett Herman Van Alstyne Baker Lake Ontario Drumm Vosurg Adams Backus Dewitt Irondequoit Bay Maple Marchner Allen Ridge Seneca Volk Inspiration Point Dickinson Ridge Bay Shore Bay View Helendale

35 Reduction From Retrofits Total 24,143 5, , ,391 47,655 % Reduction from Existing i Stormwater Pond Retrofits 55 Proposed New Ponds 3 Stream Stailization 15 Riparian Reforestation 16 Pollution Source Control 2 Total 91

36 P Load Reduction from Retrofits SSO Repair/ Aatement Channel Protection Lawn Care Eduction Erosion and Sediment Control Illicit Connection Removal Riparian Buffers Catch Basin Cleanouts Stormwater Retrofits

37 Project Outputs Prioritized project list Justification for long term funding mechanism MS4 Strategies for achieving TMDL pollutant t load allocations Compliance with MS4 Permit requirements for 303(d) streams/waters Improved water quality and reduced flooding

38 Challenges and Next Steps Challenges funding needed for: pulic involvement process, more complete storm sewer mapping, and retrofit implementation. Next Steps - complete 5 watershed assessments y 12/2011 Determine each watershed priorities More utility mapping

39 Where to go for More Informatoin The WTM is Availale at the Center for Watershed Protection s Wesite: