Beyond Runoff Reduction: Thorough Green Infrastructure Design. Zach Sample, PE Innovyze
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1 Beyond Runoff Reduction: Thorough Green Infrastructure Design Zach Sample, PE Innovyze
2 Presenter Zach Sample, PE Stormwater Products Manager Innovyze
3 Agenda Modern stormwater design (HINT: Runoff Reduction) Pros, Cons, Effects Solutions by focusing on Clear Visualization of design Clear Visualization Solution Case Study with xpdrainage
4 Why and How Runoff Reduction (RR) Started Traditional Stormwater Design Don t discharge higher flows than you used to: - Peak flow based, detain flow in single pond - Attenuate 2-100yr ARI, Rational Method and Manning s Equation We were still impacting our downstream neighbors! - Significant stream erosion was occurring - Quality of water (chemicals and solids) was poor - Groundwater and ecological habitats disappearing
5 What is RR and why it s great! Runoff Reduction, Water Quality Volume and First Flush capture: 90% of rainfall events are around 1 retain and infiltrate the dirtiest runoff RR = P*Rv*A / 12 WQv = R(P*Cv*A) FF = P*Aimp/12 Could have picked anything why Runoff Reduction? - Simple to perform volume calculation (hand calc) - Pass/Fail review criteria - RR conservative enough (Hydromodification studies not necessarily better) - Wide adoption So.. Things are perfect right?
6 RR Shortcomings and Effects Coarse, Independent facility designs Will it fit on proposed site? Cumbersome to Vet, Review and Approve Boxes are checked, but how will system REALLY behave? pathwriter.wordpress.com Designed systems are not realistic Was what will literally be in the ground assessed?
7 Clear Visualization Solutions: How to get what we really want out of RR Remember the goal: healthy, long term stormwater systems RR and Traditional Design: quick, simple, clear starting point for stormwater design Clear Visualization Solutions: Review realistic As Build systems Must lock calculations to plan/profile/treatment train Assess full dynamic hydraulics of stormwater system Integrate with CAD/GIS
8 As-Build Layout
9 Calculations Locked to Plan
10 Case Study Mater Planned Community Ashley LJA Engineering West Central Montgomery, TX Total Project: (967 acres) Case study portion of Phase 1: (157 Acres-BLUE) Masterplan developed alongside existing golf courses
11 Purpose: Develop and improve a residential site with no adverse hydrological impact Mitigate to pre-developed 25, 100 year rates Reduce pollutant runoff through distributed Green Infrastructure Reduce size of detention facility Assess viability of Green Infrastructure compared to traditional
12 Methodology: Preliminary flow assessment - Rational Method - Pipe Sizing estimate Existing Runoff Plan Typical drainage plan LID based plan
13 Pipe sizing
14 Existing Runoff Plan Based on park landuses Deluge based catchments
15 Typical Drainage Plan: Rational Sized pipe network Eastern Trunk system to be attenuated by basin Western valley to leave site untreated
16 Typical Drainage Plan Pond: 6.7 acres Two outfall pipes High flow weir
17 Typical Drainage Plan
18 Distributed Green Infrastructure Plan lumped Raingarden for each neighborhood catchment
19 Distributed Green Infrastructure Plan
20 Distributed Green Infrastructure Plan
21 Distributed Green Infrastructure Plan 1.2 acres smaller! Single outfall pipe No Freeboard issues
22 Distributed Green Infrastructure Plan
23 What was learned, next steps.. Case study - detailed schematic design process Refinement of Green scenario Alternative LID systems possible Drag/drop drainage and LID elements (time saver) Automated elevation data (time saver) One approachable, quick tool replaced workflow using SIX other programs to juggle same work
24 Thanks for joining us Zach Sample, P.E. Stormwater Products Manager TELEPHONE:
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