New Tools/Resources for

Transcription

1 New Tools/Resources for C.3 Stormwater Compliance Laura Prickett, AICP, EOA, Inc. Santa Clara Valley Urban Runoff Pollution Prevention Program

2 Outline of Presentation Updated C.3 Handbook Handbook outline Technical guidance Plant list and planting guidance Maintenance plan templates Draft C.3.i Fact Sheets Pervious Paving Landscape Dispersion Coming Soon: Rain Barrels and Cisterns Coming Soon: Rain Garden Fact Sheet

3 Why update the C.3 Handbook? Incorporate new requirements of the MRP Focus on providing information to project applicants

4 Outline of Updated Handbook Chapter Highlights 1: How to use handbook Focus on applicant 2: Regulatory requirements Explains MRP requirements 3: Preparing permit application submittals Step-by-step: prepare your stormwater mgt. plan 4: Site design measures Guidance on self-treating areas and self-retaining areas 5: Stormwater treatment (general info) 6: Specific stormwater treatment measures New user-friendly graphics Technical guidance

5 Outline of Updated Handbook (cont.) Chapter Highlights 7: Hydromodification Latest requirements per MRP 8: Operation & Maintenance HM measure selection Bay Area Hydrology Model At-a-glance maintenance issues for specific treatment measures 9: Alternative Compliance Explains MRP provision

6 Outline of Updated Handbook (cont.) Appendix Highlights A: Infiltration guidelines & depth to groundwater map B: Sizing criteria worksheets, examples, local rainfall data, and sizing curves Updated Water District guidelines and map Tools for sizing treatment measures per C.3.d C: Soil specifications BASMAA soil specifications D: Plant list/planting guidance Plant list for SC Valley E: HM applicability map Latest map F: Mosquito control Updated per DHS guidelines G: Operation & Maintenance Maintenance plan templates

7 Outline of Updated Handbook (cont.) Appendix Highlights H: Model conditions of approval (COAs) for stormwater quality I: Feasibility criteria for rainwater harvesting, infiltration Site design measure COAs Source control COAs How to evaluate feasibility of harvesting/use and infiltration J: Special Projects How to implement LID treatment reduction for Special Projects K: Standard specifications for BMPs for small projects Placeholder

8 Chapter 3 Stormwater Management Plan: Step by Step Step-by-step guide to prepare a site-specific Stormwater Management Plan Steps are listed on next slide. Rainwater harvesting system, Mills College

9 Stormwater Management Plan: Step by Step 1 Collect information 2 Determine stormwater requirements 3 Incorporate site design measures 4 Incorporate source controls 5 Determine drainage management areas on site 6 LID Feasibility/select treatment & HM measures 7 Preliminary design of treatment/hm measures 8 Specify soils and planting palette

10 Stormwater Management Plan: Step by Step 9 Coordinate stormwater plan with other elements 10 Preliminary maintenance plan 11 Submit permit application

11 Chapter 6: Technical Guidance for Treatment and Site Design Measures Technical guidance for: Treatment Measures Site Design Measures Bioretention area Green roof Flow-through planter Pervious pavement Tree well filter Grid pavements Infiltration trench Subsurface infiltration system Rainwater harvesting and use Media filter Extended detention basin

12 Technical Guidance Bioretention Area

13 Bioretention Area (continued) Example of design guidance to help applicants prepare permit application submittals.

14 Appendix D: Plant List and Planting Guidance Includes: Plant list of climate-appropriate species suitable for stormwater treatment measures General planting guidance Highlight: Plant list Identifies which stormwater treatment measure each plant can be used in, Drought tolerant species, Native species, Specific climate zones, Cross-reference to the Santa Clara Valley Water District Plant List

15 Excerpt from Plant List Mugwort Santa Barbara sedge Dense sedge Slough sedge Creeping spikerush Pacific coast iris

16 Excerpt from Plant List Mugwort Santa Barbara sedge Dense sedge Slough sedge Creeping spikerush Pacific coast iris

17 Appendix I: Feasibility Evaluation of Infiltration, Harvesting/Use Includes: Overview of approach and flow chart Guidance for using the following worksheets Feasibility Screening Worksheet Infiltration Feasibility Worksheet Harvesting/Use Feasibility Worksheet Worksheets Worksheet Attachments

18 Description of Feasibility Worksheet Attachments Glossary Tables showing toilet-flushing demand for harvested rainwater, based on land use Excerpts from the 2011 Feasibility Report Map of soil hydraulic conductivity and rain gauge areas Tables showing demand ratios for toilet flushing and irrigation Curves showing percent capture of stormwater for infiltration in bioretention areas

19 Appendix J: Special Projects Overview Descriptions of Special Project Categories A: Small Infill Projects B: High Density Projects C: Transit Oriented Development How to Calculate LID treatment reduction credits Requirement to evaluate and report LID infeasibilty Special Projects Worksheet

20 C.3.i SITE DESIGN FACT SHEETS

21 Why Prepare C.3.i Site Design Fact Sheets? Provision C.3.i requires that specific site design measures be included in: Projects that create and/or replace 2,500 to 10,000 sq. ft. of impervious surface, and Individual single-family home projects that create and/or replace 2,500 square feet or more of impervious surface. Provision C.3.i also requires the preparation of standard specifications for the site design measures.

22 Why Prepare C.3.i Site Design Fact Sheets? Per C.3.i, the Bay Area Stormwater Management Agencies Association has drafted fact sheets on: Pervious paving Directing runoff to vegetated areas Directing roof runoff to rain barrels or cisterns Residential dry creek disperses roof runoff to landscaping (Palo Alto)

23 Why Prepare C.3.i Site Design Fact Sheets? Although not required by C.3.i, due to popular demand, BASMAA will also prepare a fact sheet on rain gardens. Residential rain garden in Portland, OR

24 Why Prepare C.3.i Site Design Fact Sheets? The fact sheets are intended to: Help applicants implement C.3.i site designs in their projects. Help municipal staff communicate requirements to applicants and review project submittals.

25 Draft Pervious Paving Fact Sheet Includes: Description of pervious paving Checklist: Is pervious paving right for my project? Profiles and photos of specific types of pervious paving (see subsequent slides) Design criteria and considerations List of maintenance issues

26 Pervious Concrete DRAFT Profile and Photos

27 Turf Block DRAFT Profile and Photos

28 Unit Pavers DRAFT Profile and Photos

29 Draft Landscape Dispersion Fact Sheet Includes: Description of directing runoff to landscaping Checklist: Is landscape dispersion right for my project? How do I size my landscape? How-to descriptions and photos of specific types of landscape dispersion (see subsequent slides) Design considerations List of maintenance issues

30 Disconnected Downspouts Splash block Pop-up emitter

31 Swales or Dry Creeks

32 Parking Lot Runoff to Landscaping

33 Coming Soon! Rain barrel and cistern fact sheet Rain garden fact sheet

34 Contact Information Laura Prickett EOA, Inc x 123 Santa Clara Valley Urban Runoff Pollution Prevention Program