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The AGWA Urban ToolYoga Korgaonkar, D. Phillip Guertin, I. Shea Burns, Jane
Barlow, Carl Unkrich, David C. Goodrich, and William Kepner
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Tucson’s Stormwater Management
2
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Urban Hydrology
3
Impervious areaTopographic changes
Altered drainageSoil compaction
Stormwater ConveyanceRoadsChannelsSubsurface
Source: City of Philadelphia (www.phila.gov)
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Harvestable Water
4 Research by Dr. Evan Canfield – Pima County Flood Control
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Green Infrastructure (GI) Practices
5
Prince George’s County, MarylandMitigate impacts of urbanization
Effectiveness depends on objectiveCapture stormwater to mitigate flood and water quality
Pervious Surfaces
Augment water supplyWater HarvestingRetention Basins
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Challenges in Modeling Urban Hydrology
6
RepresentationLevel of detail
Flow Off Flow On processesStormwater conveyanceGreen Infrastructure practices
Tools for assessmentUrban layoutsFlood mitigation
Stormwater managementWater supply augmentationWater Quality
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AGWA Urban Tool
7
KINEROS2 model
GIS framework
Lot scale representationRoof, driveway, yards, pools
Subdivision scaleFlow Routing
Green Infrastructure PracticesRetention Basins
Permeable Pavements
Water Harvesting Systems
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Tucson Watersheds
8
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Bronx Watershed
9
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Flow Routing – Using LiDAR data
10
LiDARPoint Cloud
DEM(0.5m)
FlowDirection
FlowAccumulation
2015 LiDAR data from Pima Association of Governments
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Flow Routing – Using LiDAR data
11
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Flow Routing
12
KINEROS2 Flow Route Assumption
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Parameters
13
Lot/Street ParametersDimensions, slope
Land Cover ParametersRoughness, interception, canopy cover
Soils ParametersHydraulic conductivity, coefficient of variation, porosity, mean capillary drive, pore size distribution index, volumetric rock fraction
SSURGO (high resolution, nationally available)
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Precipitation Data
14
KINEROS2 requires time-depth pairs
AGWA Urban tool accepts:
NOAA
User-defined depth
User-defined hyetograph
Potential to use RADAR data
Hyetograph using SCS Type II conversion
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KINEROS2 Representation
15
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Visualizing Results
16
Output Maps:
Lot & Accumulated Runoff
Infiltration
Hydrographs
Percent Change Analysis
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Visualizing Results
17
Output Maps:
Lot & Accumulated Runoff
Infiltration
Hydrographs
Percent Change Analysis
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Visualizing Results
18
Output Maps:
Lot & Accumulated Runoff
Infiltration
Hydrographs
Percent Change Analysis
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Case Study
19
La Terraza Subdivision in Sierra Vista, AZ 13 ha – 66 Residential Lots
Rainfall Events47 observed events
SCS Type II Design Storm10 year return period (34.29 mm; 1 hour)
100 year return period (51.82 mm; 1 hour)
Three GI Practices – Lot OnlySmall Retention Basin (1.7 m3; Ks = 210 mm/hr)
Pervious Driveway (Ks = 210 mm/hr)
Water Harvesting (1.9 m3; Empty)
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Results
20
Model Validation (using calibrated parameters from Kennedy et al., 2013)
y = 1.02xR2 = 0.91
y = 1.04xR2 = 0.92
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Results
21
Infiltration Runoff Accumulated Runoff
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Results
22
Percent Change in Peak Runoff wrt Post-development
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Fort Irwin Cantonment
23
EPA – ARS – USGS projectSurface water modelingEstimate volume available for groundwater recharge
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Potential Applications
24
Model new or existing urban hydrology
Assess impacts of new or retrofitting GI practices
Integrated Watershed ManagementWater Supply
Flood Control
Water Quality
Biological Resources (Natural and Landscaping)
Sustainable Communities (Greenness)
Social/Economic Issues
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Future Research
25
Addition of more stormwater management practices
Validation of Green Infrastructure practices
LiDAR dataRepresenting surface stormwater conveyance
Continuous SimulationsPlant growth, evapotranspiration, soil biogeochemistry
Model natural and urban watersheds in combination
Link other models (eg. SWMM, HEC-RAS)
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Arizona’s “Stupid Motorist Law”
26
Driving the vehicle on a public street or highway that is temporarily covered by a rise in water level, and that is barricaded because of flooding ...into any area that is temporarily covered by a rise in water level ...
... Is liable for the expenses of any emergency response
Photo: Tucson Fire Department