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  1. Feasibility of Infiltration and Harvesting/Reuse Analysis and Documentation for Stormwater Control Plans

  2. Infiltration Criteria 250,000 hrs Overflow 20% Underdrain 12" 4% 80% What is the minimum KSAT?

  3. Treatment Infiltration/ Evapotranspiration ● Harvesting /Reuse Biotreatment(Bioretention) High-Rate Biofilter●Vault-Based Filter

  4. Screening for Adequate Demand • Identify and list sub-areas of site from which runoff could feasibly be captured • Calculate demand for toilet flushing • Compare demand to drawdown required to use 80% of average annual runoff. • Toilet flushing • Landscape Irrigation • Other uses

  5. Required Demand 30+ years of hourly runoff from one acre Overflow(20% of total) 50,000 gallonsstorage (for example, about25' diameter x 14' high) Reuse (80% of total)

  6. Select Roofs or other Surfaces Page40 • “List specific impervious areas from which runoff might be feasibly captured or stored. • All contiguousroof areas 10,000 SF andgreater mustbe listed.”

  7. Default Toilet Flushing Use *Or use project-specific data

  8. Page41 Mixed Use Development 77 DUs  2.8 residents/DU  8.6 gal/day/resident = 1854 gal/day 9000 SF retail  200 SF/employee  6.9 gal/day/employee = 310 gal/day

  9. 23 DUs x 2.8 residents/DU x 8.6 gal/day/resident = 553.8 gal/day 554 gal/day  .94 acres = 589 gal/day/acre

  10. Harvesting and Use Conundrum • Larger tributary area and lower use • Frequent overflow during wet periods • Best for water conservation • Small tributary area and high use • Uses a larger proportion of water collected • Best for disposal • Not cost-efficient

  11. Harvesting with Bioretention

  12. Regulatory Status • MRP Adopted October 2009 • Submittal May 1, 2011 • Implementation to October 2014 • Report on Reuse Implementation due December 1, 2013 • Discussion of criteria employed • Barriers to implementation and strategies for overcoming barriers • Proposed changes to criteria and rationale • Updated guidance