Regenerative Stormwater Conveyances: Giving Old, Perched Outfalls New Life APWA NC Stormwater Management Division Conference
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1 Regenerative Stormwater Conveyances: Giving Old, Perched Outfalls New Life APWA NC Stormwater Management Division Conference 16 September 2014 Ward Marotti Senior Scientist Project Manager David Kiker Technical Manager
2 Regenerative Stormwater Conveyances: Giving Old, Perched Outfalls New Life Problems Implementation Solutions Modeling RSCs Path Forward Research
3 Problem
4 Traditional Design
5 Conveyance
6 Discharge
7
8 Unintended Consequences
9 Unintended Consequences
10 Unintended Consequences
11 Unintended Consequences
12 Unintended Consequences
13 Unintended Consequences
14 Unintended Consequences
15 Unintended Consequences
16 Unintended Consequences
17 Unintended Consequences Hypoxia
18 Unintended Consequences
19 Traditional Design
20 Traditional Design William Kenneth Dickson 1929
21 Solutions
22 Modern Design
23 Modern Design
24 Modern Design
25 Modern Design
26 Traditional Retrofits Quantity/velocity OR Quality not both Expensive
27 Traditional Retrofits
28 Retrofit: RSC Regenerative Stormwater Conveyance
29 Retrofits Regenerative Stormwater Conveyance Figure Obtained From: Jane Hawkey, University of Maryland Center for Environmental Science
30 RSC Two Birds, One Stone Quantity/velocity AND Quality From Piolo Pascual ABS Project
31 Retrofit: RSC Regenerative Stormwater Conveyance Substrate
32 Alley et. Al 2002 Retrofit: RSC Regenerative Stormwater Conveyance Riffles and Pools
33 Retrofit: RSC Regenerative Stormwater Conveyance Substrate
34 Retrofit: RSC Regenerative Stormwater Conveyance Substrate Infiltration Detention Filtering Nutrient uptake (anaerobic decomposition) Nutrient adsorption
35 Retrofit: RSC Regenerative Stormwater Conveyance Riffles and Pools
36 Retrofit: RSC Regenerative Stormwater Conveyance Riffles and Pools Energy Dissipaters Sedimentation Reduce sheer stress Lateral and vertical bank/bed erosion
37 Retrofit: RSC Regenerative Stormwater Conveyance Riffles and Pools Grade Control Storage infiltration Widen flow path infiltration
38 Retrofit: RSC Regenerative Stormwater Conveyance Vegetation Native Storage infiltration Widen flow path infiltration
39 Retrofit: RSC Regenerative Stormwater Conveyance Vegetation Native Nutrient uptake Aesthetics Bank/substrate Stabilization (root mass) Energy Dissipation
40
41 Retrofit: RSC Regenerative Stormwater Conveyance
42 Retrofit: RSC Regenerative Stormwater Conveyance Effectiveness RSC 70% TP 70% TN 90% TSS Bioretention 45% TP 35% TN 85% TSS
43 Retrofit: RSC Regenerative Stormwater Conveyance
44 Retrofit: RSC Regenerative Stormwater Conveyance Effectiveness Quantity Storage Delayed Release Velocity/sheer stress reduction
45 Retrofit: RSC Regenerative Stormwater Conveyance Effectiveness Traditional = 2-3 x RSC /unit treatment
46 Retrofit: RSC Regenerative Stormwater Conveyance Effectiveness
47 Retrofit: RSC Regenerative Stormwater Conveyance Research
48 Retrofit: RSC Regenerative Stormwater Conveyance Research Quantity Storage Delayed Release Velocity/sheer stress
49 Retrofit: RSC Regenerative Stormwater Conveyance Research Cizek, 2014 Quantity Storage Delayed Release Velocity/sheer stress
50 Retrofit: RSC Regenerative Stormwater Conveyance Implementation
51 Retrofit: RSC Regenerative Stormwater Conveyance Linda Lake
52 Retrofit: RSC Regenerative Stormwater Conveyance Linda Lake
53
54
55
56
57 Baffles & IWS Zones Internal Water Storage (IWS) Zone Internal Water Storage (IWS) Zone From Anne Arundel County Design Guidelines Impervious Baffles Mimic bio-retention and IWS zones Improve WQ performance
58 Retrofit: RSC Regenerative Stormwater Conveyance Modeling
59 Why Model? Iterative Design Process Evaluate Overland Flow Design a stable system Size boulders and riffle material Manning s spreadsheet analysis HEC-RAS analysis Quantify Infiltration: Pilot study for pollutant removal capabilities Infiltration rate calculated Darcy s spreadsheet analysis
60 Design Process Rules of Thumbs Iterative Process Align in Thalweg Riffle/Pools Sequence Calculate Slopes Overall Slope <5% Cascades <10% Recent Findings Riffle Pool Cascade
61 Parabolic Boulder Section 8 min. top width 10(H): 1(V) side slopes Max riffle length of 8 feet; Min length of 4 feet Pool length > 2 x riffle length Homeport Farms, MD Courtesy of Anne Arundel County
62 Sequencing Alternating Riffles and Pools Cascade w/s Three Pools From West VA Stormwater Management & Design Guidance Manual
63 Design Process Iteratively Design Riffle Trial riffle width and D 50 Calculate Manning s n value Calculate V 100 Check permissible V with D 50 Target sub-critical flow (not supercritical) Adjust size/slope/lengths/riffle material
64 WK Dickson In-House Model RSC Infiltration Model HEC-HMS outflow hydrographs Stage-Storage relationships for pools Surface area of pools Assumed hydraulic conductivity Cell-by-cell infiltration estimated Routed inflow hydrograph Darcy s Eqn for groundwater flow
65 Retrofit: RSC Regenerative Stormwater Conveyance Little Jackson Creek/Up Ditch
66 Retrofit: RSC Regenerative Stormwater Conveyance Little Jackson Creek/RR Ditch
67
68
69 Unintended Consequences
70 Path Forward
71 Path Forward
72 Path Forward
73 Biofiltration Conveyance Step Pools
74
75
76
77
78 Ward Marotti Senior Scientist Project Manager David Kiker Technical Manager
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