REGIONAL STORMWATER MANAGEMENT IN THE TROY BROOK WATERSHED

Transcription

1 REGIONAL STORMWATER MANAGEMENT IN THE TROY BROOK WATERSHED

2 Rutgers Involvement Christopher C. Obropta, Ph.D., P.E. Water Resources Extension Specialist with Rutgers Cooperative Extension and Assistant Professor with the Department of Environmental Science Project Manager of the Regional Stormwater Management Plan for the Troy Brook Watershed

3 16.1 square miles Entirely within Morris County A Subwatershed of WMA 6, contributing to the Whippany River and finally the Passaic River Freshwater Non-Trout Use Classification Watershed Facts

4 Dominated by 3 municipalities: Mountain Lakes Boro Parsippany-Troy Hills Twp Hanover Twp Other contributing municipalities include: Boonton Twp Town of Boonton Denville Twp East Hanover Twp Municipalities of the Watershed

5 Watershed Land Use 53% URBAN 21% FOREST 21% WETLANDS

6 Urban Land Use

7 Imperviousness of Watershed Major Areas of Imperviousness: Highways and Roads Parking lots/roof tops of corporate campuses High density residential districts

8 Stormwater Defined Stormwater is the water from rain or melting snows that can become runoff, flowing over the ground surface and returning to lakes, streams and recharging groundwater. Storm water runoff includes the water and everything it picks up along the way.

9 Impacts of Imperviousness Evapotranspiration Runoff Recharge

10 Many existing water quality problems are the result of non- point source pollution linked to stormwater runoff; Stormwater runoff can degrade the quality of wetlands, surface water and ground water and eventually our drinking water; Stormwater runoff can cause flooding, erosion and loss of ground water recharge Stormwater Management

11 New Regulations Stormwater Management Rules NJAC 7:8 Statewide Basic Requirements Special Water Resource Protection Area Municipal Stormwater Plan (mandatory) Regional Stormwater Management Plan (Optional)

12 Benefits of Regional Planning Allows more stringent regulations to be required of developers in environmentally sensitive areas Focuses on flooding and water quality issues for entire watershed Provides specific solutions to defined watershed problems Promotes cooperation among the various entities to address water resource issues And the RSWMP will provide information that the municipalities can incorporate into the individual municipal SWMP saving them money

13 RSWMP Must be at least as protective as performance standards for the drainage area (which could be set by a TMDL) Must be a participatory process Will be reviewed and adopted as an amendment to the WQMP Must address stormwater related water quality, groundwater recharge and/or water quantity impacts of new and existing land uses Must be developed on a drainage area basis

14 RSWMP Process Milestone #1 submission for recognition as a RSWMP Committee Form a RSWMP Committee (specific invitees are required) Designate a lead planning agency (LPA) does not have to be the grantee LPA submits to DEP a request for formal recognition as a RSWMP Committee Grantee, LPA, and DEP project review team to discuss progress and next steps (at this point a draft work plan and schedule for completion of RSWMP must be presented)

15 RSWMP Process cont d Milestone #2 Characterization & Assessment of Drainage Area Will be focused on the specific SW related problem identified at the outset of the project and NOT the assessment of the entire drainage basin Must include the components outlined in N.J.A.C. 7:8-3.4 Grantee, LPA, and DEP project review team meet to discuss progress and next steps (at this point report of items obtained & developed as part of C&A must be presented as well as checklist of mandatory items)

16 RSWMP Process cont d Milestone #3 Drainage Area Specific Water Quality, Quantity & Recharge Objectives Identify specific objectives for the RSWMP which will improve problem(s) ) identified at the outset of the project RSWMP objectives identified should address water quality and quantity, groundwater recharge, and any other SW problems identified Grantee, LPA, and DEP project review team meet to discuss progress and next steps and revised scope of work, if needed (at this point grantee or LPA must discuss how each requirement of C&A was met and how the analysis was conducted and outline specific objectives of the RSWMP)

17 RSWMP Process cont d Milestone #4 SW Management measures and Performance Standards Identify drainage area specific design and performance standards (N.J.A.C. 7:8-5) Identification of stormwater management measures to achieve the objectives Grantee, LPA, and DEP project review team meet to discuss progress and next steps (at this point grantee or LPA present SW management measures chosen to address the outlined objectives)

18 RSWMP Process cont d Milestone #5 Submission of Completed RSWMP for Review Implementation plan development Preparation of RSWMP for submission to NJDEP Grantee, LPA, and DEP project review team meet to discuss progress and next steps (at this point the LPA will present the entire RSWMP for formal review) Troy Brook Watershed

19 RSWMP Process cont d Milestone #6 Revisions to the RWSMP to Address Review Comments Respond to DEP project review team comments Revise RSWMP as needed Grantee, LPA, and DEP project review team meet to discuss progress and next steps (at this point the LPA present revised RSWMP to Department for official review)

20 RSWMP Process cont d Milestone #7 Proposal of the RSWMP Amendment to the Morris County WQMP LPA to propose RSWMP as an amendment to the Morris County WQMP LPA must continue support until adoption of amendment

21 RSWMP Adopted The specific req s of the plan will supersede any SWM req s of the SWM rules for new development (can be more stringent) DEP will use the RSWMP for SW review in the following programs: Coastal permitting, freshwater wetlands, CAFRA, stream encroachment, NJPDES, and Dam Safety Municipalities must incorporate the req s of the RSWMP into the MSWMP and ordinances SWMPs regulated under the residential site improvement standards must conform to the RSWMP DEP shall not issue a permit that conflicts with the any WQMP

22 Troy Brook Process Letter of invitation sent out to all required stakeholders in October 2003 and second letter in January 2004; Elected Lead Planning Agency Field visits have been scheduled with each Township, some environmental organizations, and lake associations; Have evaluated stormwater infrastructure in all townships; Examining plans and acquiring data on municipal zoning, roads, soils, and stormwater lines; Entering all information into a GIS system; Working with TRC Omni in modeling the watershed.

23 Field Evaluations

24 Field Evaluations Lake Intervale, Parsippany-Troy Hills

25 Field Evaluations Cedar Terrace, Parsippany-Troy Hills

26 Field Evaluations Cherry Hill Road, Parsippany-Troy Hills

27 Field Evaluations Grecian and Ulysses Drive, Parsippany-Troy Hills

28 Field Evaluations Tivoli Gardens, Parsippany-Troy Hills

29 Field Evaluations Forge Pond, Parsippany-Troy Hills

30 Field Evaluations Paris Place, Parsippany-Troy Hills

31 Field Evaluations Municipal Public Works, Parsippany-Troy Hills

32 Field Evaluations Near Reservoir and Rt. 287, Parsippany-Troy Hills

33 Field Evaluations Rainbow Lake, Parsippany-Troy Hills

34 Field Evaluations Twilight Lake, Parsippany-Troy Hills

35 Modeling the Watershed 2-Step Modeling Approach Hydrologic Model Hydraulic Model

36 Hydrologic Model Estimate volume of surface runoff from various design storms. - 2 year storm -10 year storm - 25 year storm - 50 year storm -100 year storm - Hurricane Floyd

37 Hydraulic Model Routes the flow of water in the streams Determines the level of water in different sections for various design storms Maps the limits of the flood plain for various design storms

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43 Model Next Steps Refine Models Evaluate Cross Sections Incorporate Road Crossing and Culvert Data Incorporate Storage Areas Data Calibrate Models Validate results Simulate Future and Critical Scenarios Implement Nonpoint Source Model Identify Critical Areas for detailed Analysis Simulate impacts of BMPs

44 For More Information Sandra Goodrow, Rutgers Water Resources Program Associate, Watershed Modeler Katie Buckley, Rutgers Water Resources Program Associate, GIS Specialist Jeremiah Bergstrom, TRC Omni Environmental Corp. Project Manager, GIS Specialist/Landscape Architect Chris Obropta, Ph.D., P.E., Rutgers Water Resources Extension Specialist for the State of NJ

45 Rutgers Involvement Christopher C. Obropta, Ph.D., P.E. Water Resources Extension Specialist with Rutgers Cooperative Extension and Assistant Professor with the Department of Environmental Science Project Manager of the Regional Stormwater Management Plan for the Troy Brook Watershed