The Evolution of Stormwater and Rainwater Harvesting in Minnesota. The Minnesota Stormwater Manual Updates and Examples

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1 The Evolution of Stormwater and Rainwater Harvesting in Minnesota The Minnesota Stormwater Manual Updates and Examples Presented by: Dave Stark December 5 th 2016 ARCSA 2016 National Conference

2 Minnesota Stormwater Manual Minnesota Stormwater Manual Lead agency for manual Stormwater Go to source for stormwater information Contractors hired for technical work with oversight committees Minimal impact design standards (MIDS) Lead contractor for design standards and model Stormwater and rainwater harvesting wiki Lead contractor for manual updates

3 Rainfall Trends

4 2012 Duluth Flood

5 And the Weather

6 Water Use and Population Trends PLANNING/MASTER-WATER-SUPPLY-PLAN-2015/Master-Water-Supply-Plan-Appendix-2.aspx

7 White Bear Lake A Wakeup Call on Water Supplies

8 How is Stormwater Managed in Minnesota?

9 Minimal Impact Design Standards What is MIDS? Four basic components: 1. Stormwater volume performance goals 2. Calculator to standardize and quantify ( credit ) the benefits of LID BMPs 3. Design specifications for a variety of LID BMPs (continuing in Stormwater Manual update) 4. A model MIDS ordinance package

10 What are the Performance Goals? Most Sites Clay, Sites etc. Contaminated Off Site Retain on site 1.1 of runoff from new and/or fully reconstructed impervious surfaces Retain 0.55 of runoff from the new and/or fully reconstructed impervious surfaces AND Remove 75% of the annual TP load Achieve as much volume reduction as practicable AND Remove 60% of the annual TP load Off-site mitigation

11 MIDS Calculator and Practices Bioretention Permeable Pavement Swales Infiltration Basin Stormwater Disconnect, Iron Enhance Sand Filters etc. What is MIDS and how it is different WHAT S MISSING? RAINWATER AND STORMWATER CAPTURE AND ALL APPROVED USES Tree Trenches Green Roofs Sand Filter Stormwater Pond Wetlands

12 Minimal Impact Design Standards Ability To Link BMP s Rainwater Tank -> Infiltration Soil and Land Use -> Curve Numbers

13 Stormwater and Rainwater Harvesting -Wiki Contents Definitions Design Criteria Construction Specifications Operation and Maintenance Water Quality Considerations Cost benefit Considerations Case Studies Calculating Runoff Reduction Credits

14 Survey with Stormwater Wiki Update

15 Survey Summary Q-What is the source of the water you are using? Q-Why did you Implement the project? Q-What difficulties did you experience implementing the project?

16 Code Status Minnesota adopted the 2012 Universal Plumbing Code (UPC) with state amendments including Rainwater Harvesting on January 23, Stormwater or Graywater Re-Use Not Included Widespread use of stormwater and pond applications for outdoor irrigation. No current regulations on water quality.

17 Water Re-Use Interagency Effort Agencies Education and Research Funding

18 Clean Water Fund Water Reuse Project A comprehensive assessment of regulatory and nonregulatory approaches for ensuring safe and sustainable water reuse 1. Identify current support and barriers to water reuse 2. Develop recommendations for safe, sustainable water reuse practices and policies 3. Update plumbing codes and treatment standards to allow for safe and practical water reuse

19 What Water Sources Are Being Considered? Sources Stormwater Rainwater Wastewater Domestic Wastewater Graywater Industrial Process Water Subsurface water End uses Nonpotable water Flushing Irrigation Cooling Washing Industrial process Aquifer recharge Infiltration Direct injection Potable water

20 Support for Re-Use Mounting Public Health Collaborative

21 Innovative Funding Mechanisms Source:

22 Upper Villa Park Stormwater Concrete Tank Overflow to Infiltration Chambers Harvesting Reuse

23 Oneka Ridge Golf Course Water Re-Use Irrigation Project 915 acre drainage area 75% Annual P Load Reduction 100 acre-feet in volume reduction 40-50% decrease in groundwater

24 St. Anthony Village Stormwater Reuse 15 acre capture 500,00 Gallons 20 acre irrigation 77.5% P Reduction

25 St. Louis County Motorpool Facility Outdoor irrigation and indoor vehicle washing Before After

26 St. Paul Saints Baseball Stadium Outdoor Irrigation and Toilet/Urinal Flushing

27 Hennepin Energy Recovery Center Capture water for reuse. Approximately 25 percent of the rain and snow falling on Target Field Station flows into two cisterns and is then reused in the Hennepin Energy Recovery Center (HERC).

28 Rainwater Harvesting Volume Reduction Treatment Train Conceptual Model Great Start to A Stormwater Treatment Train Volume Reduction through use Relies on Permeable Soils for Infiltration Does Not Address other Stormwater Figures by Foraste 2009

29 ARCSA Standard 78 Compliant Stormwater Pre-Treatment Trains

30 What is Your Design Objective? Various Stormwater Treatment Approaches What Does it Treat -Mainly TSS, floatable, hydrocarbons What doe it treat >80% TSS removal (d50 = 23µ) >75% Total Phosphorus reduction >50% Turbidity reduction

31 Modular Linked Systems For Rainwater and Stormwater Harvesting Stormwater Tank Ground Capture Sized Overflow From Tank 1 Plus Ground Area Various Treatment Methods -> TSS, P Reduction Pump and treat for outdoor use only (MN) Rain Tank Roof Top Capture Treat with 4 Step System to Maintain Quality Tank and Filter Overflow To Storm Trtmt. Pump and treat for outdoor or indoor uses

32 Rainwater and Stormwater Industry in MN Comprehensive harvest and re-use program that addresses a variety of source waters. San Francisco as a model. Residential and commercial included Plumbing codes updated to include Graywater Re-use Stormwater with proper treatment for interior use Increased coordination of education efforts. U of MN Stormwater/Septic Extension MN Irrigation Association MN Water Quality Association ARCSA/ASSE

33 Thank You Questions? I d like to thank and acknowledge the efforts of these colleagues who have lead these efforts and welcomed industry input. Anne Gelbman at MPCA for Information on MIDS Anita Anderson at MDH for Leading the Interagency Effort Kurt Leuthold at Barr Engineering On Modeling/Calculator Brett Emmons at Emmons and Oliver Resources Section Updates

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