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WLR3 modelling
12
Transcript
Urban Hydrology Restoration
proof of concept modeling
can distributed stormwater controls create a departure in urban hydrology?
what reduction in effective impervious cover can be achieved?
method
general overview
- SWAT: Soil and Water Assessment Tool
- Urban Creek with baseline data
- Calibrated current conditions model
- A gradient of impervious cover
- Three saturation scenarios
hydrologic metrics
an overview
hydrologic metrics
can distributed stormwater controls create a departure in urban hydrology?
peak flows
what reduction in effective impervious cover can be achieved?
hydrologic metrics
baseflow ratio
what reduction in effective impervious cover can be achieved?
hydrologic metrics
flashiness
hydrologic metrics
erosive events
what reduction in effective impervious cover can be achieved?
what we learned
- incremental changes in hydrology with increasing density of cisterns and raingardens
- distributed controls in public and private property create a shift in hydrology even though transportation and ROW were not incorporated
- High scenario corresponds to 20% to 30% impervious cover (suburban)
data going in
- topography (DEM, 10ft)
- soils (NRCS, SURGO)
- rainfall, temperature (1987-2014)
- existing controls (detention, water quality)
- landscape management assumptions
- cisterns: 1.8" runoff from average roof size
- raingardens: sized per ECM guidance
why this watershed
- 8+ years of baseline gauge data
- fully urbanized (3.5% undeveloped)
- high priority given water quality problems (EII)
- relatively small drainage area (~1 sq mile)
- mix land uses, public and private
the watershed
Waller Creek headwaters
three scenarios
transportation not included
results
the hydrograph
can distributed stormwater controls create a departure in urban hydrology?
some facts
2015
1997
1940
- ~47 % impervious cover
- majority of slopes 0-8%
- 39% residential
- 18% industrial+commercial+industrial
- 22% transportation
- 21% others (parks, undeveloped, civic)
- urban creek network
- Blackland Prairie - Edwards Plateau
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