Los Angeles County Storm Water Modeling –Bringing Data TogetherTJ MoonCivil EngineerCounty of Los Angeles Department of Public Works
The Los Angeles County Flood Control District
LACFCD owns and operates a vast flood control and water conservation system:
• 14 major dams
• 27 spreading grounds
• 500 miles of open channels
• 3,000 miles of storm drain
• Over 150 debris basins
Serves 10 million residents over 2,700 square miles!
The “Model” Solution
GIS BasedWatershed
Model
Rainfall
Streams
WaterQuality
LandUse
Elevation
Dams
POTWs
SpreadingGrounds
Soils
SlopesSub-
BasinsGIS
Dam/Reservoir Representation
0
50
100
150
200
250
300
350
1050 1100 1150
Dis
char
ge (c
fs)
Water Surface Elevation (ft)
Morris Dam Depth vs Discharge Curve
Constructed F-Table
Depth StorageVolume
(acre-feet)
Discharge (cfs)
102 6,114 0
107 6,795 37
132 10,995 37
148 14,751 59
186 26,261 800
187 26,280 2,218
190 27,718 4,063
Actual Dam Operation
Flow -Table
Treatment Plant Representation
Subbasin Permit Flow (cfs) Name Load (MPN) Date5034 1108950 0.6 Fecal Bacteria 200 10-23-2007
Point Source Input
Los Coyote Water Reclamation PlantSan Gabriel River Watershed
Watershed Management Modeling System
Weather text file
Access Database
GISInterface
LSPC Model
Results
-
200,000
400,000
600,000
800,000
1,000,000
1,200,000
'01 '02 '03 '04 '05 '06 '07 '08 '09 '10 '11
Flow
Vol
ume
(ac-
ft)
Water Year
Hydrological Calibration/ValidationLos Angeles River Flow
Modeled DataObserved Data
Other Uses• MS4 Permit – TMDL Compliance – California Water
Quality Regional Board• Climate Change Studies - U.S. Bureau of Reclamation• Stormwater Master Plans - Los Angeles Department of
Water and Power• Research - UCLA’s Water Sustainability Analysis Project• Research – Pardee Rand Graduate School Project
“All models are wrong but some are useful” – George E. P. Box
Conclusion
LACountyWMMS.comTJ Moon
[email protected]@tjmoon_LACoDPW
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