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WLR3 modelling

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by

ana gonzalez

on 8 March 2017

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Transcript of WLR3 modelling

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
SWAT: Soil and Water Assessment Tool

Urban Creek with baseline data

Calibrated current conditions model

A gradient of impervious cover

Three saturation scenarios
the watershed
Waller Creek headwaters
1940
1997
2015
~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
some facts
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
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
results
three scenarios
transportation not included
the hydrograph
can distributed stormwater controls create a departure in urban hydrology?
can distributed stormwater controls create a departure in urban hydrology?
what reduction in effective impervious cover can be achieved?
hydrologic metrics
peak flows
general overview
an overview
hydrologic metrics
hydrologic metrics
baseflow ratio
what reduction in effective impervious cover can be achieved?
hydrologic metrics
flashiness
what reduction in effective impervious cover can be achieved?
what reduction in effective impervious cover can be achieved?
hydrologic metrics
erosive events
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)
Full transcript