Webcast 2: Watershed Treatment Model

Transcription

1 Webcast 2: Watershed Treatment Model Welcome to the Webcast To Ask a Question The lower lefthand corner of the screen contains a chat box. Click on the Public tab and type your question in the box and click on the arrow to submit it. We will try to answer as many questions as possible during the webcast. To Answer a Poll Question Polling questions will appear throughout the webcast. To answer a poll question, click on the radio button to the left of your answer and click submit. Do not type your answer in the chat box. To Adjust How the Slides Appear on Your Screen On the top of your screen, click on the small down arrow next to the button that looks like. Scroll down to Zoom and click on Auto Fit. Welcome to the Webcast To Complete the Webcast Survey After the webcast, we will have a short multiple choice survey to get feedback on your experience. Please take a few minutes to fill the survey out so we can identify areas for improvement. Continuing Education Credits We are offering CEUs for our watershed and stormwater management webcast series. A total of 1.0 CEU can be earned for attending five webcasts. Only the registered attendee is eligible to earn the CEU. The registered attendee must watch the entire webcast. webcast@cwp.org if you are interested in earning CEUs and did not indicate this during the registration process. Two PDUs are also available for certified professionals (CPESC, CPSWQ) for this webcast. Resources After the webcast, we will a resources sheet, speaker contact information, and the presentation. Hye Yeong Kwon, CWP Cast (In Order of Appearance) NickLindow,Biohabitats RosauraVega, US EPA Paula Smith, Monroe County, NY Deb Caraco, CWP Neely Law, CWP Webcast Overview Introduction to TMDLs What is the WTM? Case Studies Montgomery County, MD Monroe County, NY How to Use the WTM Design Example TMDLs: From Development to Implementation Rosaura Vega, US EPA

2 Defines the water quality goal Compile data/information and assess waterbody condition 303(d) Program 40 CFR Implementation TMDL Overview A TMDL is a calculation of the maximum amount of a pollutant that a water body can receive and still safely meet water quality standards, and an allocation of that amount to pollutant sources. TMDL = WLA + LA + MOS WLA: Sum of waste load allocations (point sources) LA: Sum of load allocations (nonpoint sources) MOS: Margin of Safety Over 43, 000 TMDLs have been developed to date. 7 TMDL Pipeline / Listing (identifying impaired or 303(d) waters and the causes of their impairments), Planning (development of the TMDL, TMDL alternative, and/or Implementation Plan), Implementing (applying controls, i.e., point source permits or nonpoint source Best Management Practices (BMPs)), Improving (making incremental progress in environmental condition but still short of water quality standards), and Recovery (fully meeting water quality standards). Strategies for TMDL Development Development of TMDLs that include detailed implementation plans can lead to more implementation activities on the ground. Adaptive management approaches can be applied to TMDL implementation to continually reassess progress towards goals. Followup monitoring of water quality response can help verify whether the selected BMP practices are in fact working. Introduction to the Watershed Treatment Model (WTM) The Need There is no simple way to track the full range of management options in urban watersheds. A simple, spreadsheet model for the rapid assessment of watershed treatment options Annual output What is the WTM? Pollutant loads (lbs/acre) Bacteria Loads (MPN/yr) Runoff Volume (acreft/yr)

3 A Word About Version Control The (widely) publicly available (on CWP s website) version of the WTM is version 3.1 Version 2010beta is distributed with this webcast. Primary Sources WTM Terminology Secondary Sources Management Practices Discount Factors W T M ABCs Determined Entirely from Land Use/Cover Residential Commercial Industrial Forest Rural Primary Sources Cannot be calculated solely by land use Examples CSOs, SSOs Septic Systems Channel Erosion Secondary Sources Types of Management Practices Structural: ponds, swale, LID etc. Non Structural: street sweeping, downspout disconnect, buffers Programmatic: lawn and pet waste education, etc Discount Factors Ideal load reductions can rarely be achieved Lack of space Imperfect practice application Inability of programs to be completely effective Discount factors "discount" load reductions to account for less than perfect application of practices.

4 Example: Erosion and Sediment Control (ESC) Base Conditions Load from Uncontrolled construction is 1000 lb TSS/year Practices can achieve 70% effectiveness (base efficiency), or 700 lb/year BUT Only 80% of Sites are Regulated Down to 0.8*700, or 560 lbs/year ESC Discount Factors A combination of poor installation and maintenance reduces practice implementation/effectiveness by 25% Down to 0.75*560, or 420 lbs/year Case Study #1: Implementation Planning; Montgomery County, MD Q & A Nick Lindow, Ph.D. Biohabitats FollowUp Questions: webcast@cwp.org MD DEP Permit Requirements for Montgomery County Restoration 20% Retrofit TMDL Wasteload Allocations Trash Reduction Develop Implementation Plans* Track Progress* Implementation Plan for Rock Creek 61.5 square mile drainage area in Mo Co. Bacteria TMDL 21% Overall Impervious Cover Upper Rock Creek Special Protection Area (SPA) Impervious cap (8%) DRAFT

5 Using the WTM in Rock Creek Calculate Baseline Pollutant Load Existing Land use areas Pollutant load by land use (EMCs or Unit Loads) Evaluate Future Practices Start with practices beyond the TMDL base year Next implement practices in the CIP plan Then Retrofits and programmatic practices. Future Practices Evaluated (beyond those in the CIP) Summarize potential retrofit opportunities Implement nonstructural BMPs Voluntary Stormwater Management Reforestation Pet Waste Education Treated Urban Land 16% Land Area Progress Tracking in Rock Creek Baseline Loads Forest 6% Rural Land 5% Urban Land 72% Bacteria Wasteload over Time 100% WTM Calculation Waste Load Allocation Treated Urban Land Forest 9% Rural Land 1% 3% Bacteria Loads ) e lin se Ba f o (% al ov m e R ria cte a B 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% DRAFT Urban Land 87% DRAFT WTM Baseline Completed Load* Projects Current CIP Future CIP Targeted Inventory Inventory Retrofits Implementation Phase Riparian Buffer MS4 Reforestation Programmatic Practices Balancing the Budget Dealing with Wildlife Restoration Strategy Structural BMPs Riparian Reforestatio Pet Waste n Education Restoration Target 3,265 Acres IA 358 Acres 78,909 households Bacteria Removal (billion/yr) Cost (Million $) Efficiency (Billion MPN /Million $) 131,262 $ ,700 $ ,602 $ ,286 DRAFT

6 Case Study #2: Restoration Planning, Monroe County, NY Case Study 2: Assessing Restoration Potential in Shipbuilders Creek Paula Smith, P.E. Monroe County, NY Lake Ontario Shipbuilders Creek Watershed Rochester Watersheds In Monroe County NY Tracking Pollutants of Concern Stream impacts from urban land use and channelization Upland contributions from hotspots and large impervious areas Urban Land Active Construction Summary of Existing Loads TN lb/year 25, TP lb/year 5, TSS lb/year 528,257 94,508 Fecal Coliform billion/year 911,525 Runoff Volume (acrefeet/year) 47, Shipbuilders Project List Stormwater Pond Retrofits Proposed New Ponds Stream Stabilization SSOs Illicit Discharges ,572 2, , ,238 Riparian Reforestation 16 Channel Erosion Rural Land Livestock Open Water Total 919 1, ,617 6, ,764 52, , ,177 22,924 1,600 1,484, ,841 Pollution Source Control Total 2 91

7 Reduction From Proposed Practices TN TP TSS Fecal Coliform Runoff Volume lb/year lb/year lb/year billion/year (acre feet/year) Urban Land 20,761 4, , ,734 47,532 P Load Reduction from Retrofits SSO Repair/ Abatement Channel Protection Lawn Care Eduction Erosion and Sediment Control Active Construction SSOs Illicit Discharges Channel Erosion ,290 2, , ,062 64, Illicit Connection Removal Riparian Buffers Catch Basin Cleanouts Rural Land 1, ,902 22, Livestock ,600 Open Water Total % Reduction from Existing , , , , , ,655 0 Stormwater Retrofits Lessons Learned Field work completed using the Urban Subwatershed Restoration methods from the CWP provided many WTM inputs. 3 professional water quality surveys done in our region (2000, 2006, 2009) provided inputs to override WTM defaults for lawn care and pet waste program effectiveness. WTM defaults for residential land use % impervious and turf cover (primary sources tab) were replaced to better reflect County LIDAR data. Q & A FollowUp Questions: webcast@cwp.org A Few WTM Details Model Structure Model Structure Some Data Entry Tips and Rules Ongoing WTM Updates The (Tasmanian) Devil s in the Details

8 Step 1: 1a. Primary Sources 1b. Secondary Sources 1c. Existing Management Practices 1d. Existing Loads] Spreadsheet Tabs Step 2: 2a. Future Management Practices 2b. Retrofit Worksheet 2c. Load with Future Management Practices Step 3: 3a. Future Land Use 3b. New Development 3c. Loads With Future Growth Data Entry: The WTM is ColorCoded! Green (Cells and Tabs) require user input Blue Cells are defaults the user can override Grey Cells should not be modified Purple (Cells and Tabs) represent Final Outputs Pet Waste Education Program in Place? Both # of dwelling units Enter0 Value Fraction of Households with a Dog 40% Owners who Walk their Dogs (fraction) 50% Owners who Clean Up (fraction) 60% Fraction willing to change behavior 60% Awareness of Message (Fraction of Population) Enter 0% Value no yes Use Local Data if Available Data Entry: Pay Attention to Pop Up Guidance A Few Data Entry Tips Keep a copy of the original (unmodified) for future watershed plans. At cells with a pulldown menu, you cannot override the options. Make sure you scroll over completely. On some screens (especially the Retrofit Worksheet), data entry cells may not be visible immediately. Key Updates in the 2010 WTM Evaluates turf and septic systems in more detail Runoff is based on both pervious and impervious surfaces More user input guidance onscreen More detailed breakdown of surface/subsurface flows Revised estimates for benefits of septic systems, lawn care, and stormwater retrofit practices Coming soon The WTM is Evolving. Addition of an Agricultural BMP Management Sheet Updates to Model Documentation Responses to User Input. Direct suggestions to Deb Caraco.

9 WTM Exercise: Retrofits What are retrofits & why retrofit? Watershed characteristics Exercise Neely Law, CWP WTM: Retrofit Exercise Copy of: WTM 2010Webcast Retrofit Example Base.xls WTM_Retrofit_Exercise.doc WTM Parameterization 405 acre, residentialcommercial watershed 15% impervious cover C soils Sewered 50% lawns compacted Stormwater practices Dry pond (drainage area of 100 acres) Monthly, mechanical street sweeping WTM: Retrofit Exercise Scenario 1 Retrofit existing dry pond Scenario 2 Bioretention for commercial land use Scenario 3 Rooftop disconnection for residential land use Resources WTM guidance and blank WTM will be sent postwebcast. Other Resources on the downloadable Resources Page A Few More Questions FollowUp Questions: webcast@cwp.org Post Webcast Information To Complete the Webcast Survey We will be providing you with a short multiple choice survey to get feedback on your experience. Please take a few minutes to fill the survey out so we can identify areas for improvement. Continuing Education Credits We are offering CEUs for our watershed and stormwater management webcast series. A total of 1.0 CEU can be earned for attending five webcasts. Only the registered attendee is eligible to earn the CEU. The registered attendee must watch the entire webcast. webcast@cwp.org if you are interested in earning CEUs and did not indicate this during the registration process. Two PDUs are also available for certified professionals (CPESC, CPSWQ) for this webcast. Participation Certificate Participation certificates are also available. If you have multiple attendees, please save the certificate to your computer. You can type the attendees name in the name field and then print the certificate.

10 Webcast Archive We will make every effort to post the archive as quickly as possible. The archive should be available on the first Monday following the webcast, pending any edits. Registered participants will receive instructions for accessing the archived webcast. The archive will be downloadable and can be saved on your local machine. Upcoming Webcasts for 2010 Permeable Pavement Design, Installation, and Maintenance (August 25) Rooftop Disconnection, Filter Strips & Rainwater Harvesting (October 20) Better Site Design Gets Better (December 15) Register at Join the Association of Watershed and Stormwater Professionals (AWSPs) for an Introductory Membership Price of $219. Benefits include: Two issues of our journal (due out in Fall 10 and Spring 11) Substantial webcast discounts 50% discounts on publications Membership through August 11 Subscription to our quarterly, enewsletter, Runoff Rundown. Rosaura Vega U.S. EPA Office of Wetlands, Oceans, and Watersheds (202) Speaker Contact Info Paula Smith, P.E. Monroe County Environmental Services (585) Nick Lindow, PhD Biohabitats (410) Deb Caraco, P.E. Center for Watershed Protection (607) To register visit Neely Law, PhD Center for Watershed Protection Hye Yeong Kwon Center for Watershed Protection