Guadalupe Watershed Model Year 1

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Guadalupe Watershed ModelYear 1
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• Presentation to SPLWG Dec. 8, 2008
• Michelle Lent, John Oram, Lester McKee

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• Basic Objective
• To understand the source, release, and transport
  of suspended sediment, Hg and PCBs from Guadalupe
  Watershed to San Francisco Bay
• Timeline
• Year 1 (2008) Hydrologic model
• Year 2 (2009) Sediment and contaminants model
• Details (The how, what, and why)
• Estimate/confirm mercury and PCB loads
• Determine proportional loads
• When, and from where, are constituents
  transported
• Assess potential effects of BMPs
• Refine assumptions of the Hg TMDL

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Watershed Modeling Overview
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Hydrological Simulation Program - FORTRAN (HSPF)
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Required Hydrology Model Inputs
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• Meteorological data
• Precipitation
• 15 min. data from SCVWD
• Evapotranspiration
• Hourly data from CIMIS
• Geographic data
• Topography
• 30 m DEM from NED
• Landuse data
• ABAG 2000 Landuse map
• Soil data
• Hydrologic Soil Group map from SCVWD

• Water import/export data
• Reservoir releases
• 15 min. data from SCVWD
• Diversions
• 15 min. data from SCVWD

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Data Richness of Guadalupe River Watershed
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Watershed Delineation
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Subbasin Delineation
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Meteorological Segmentation
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Calibration/Validation Process
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Adjust parameters and/or model setup
Run model compare output to WY 2000 - 2005
data
No
Satisfactory performance?
Yes
Run model compare output to WY 2006-2007 data
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Calibration Sites
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• Guadalupe River
• Most downstream gauge

• Canoas Creek
• Mostly urban/developed
• Mostly low elevation
• Not reservoir fed

• Guadalupe Creek
• Mostly undeveloped
• Mostly higher elevation
• Reservoir fed

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Model Calibration - Annual Flow
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Guadalupe River
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Model Calibration - Daily Flow
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Guadalupe River
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Model Calibration - Hourly Flow
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Guadalupe River
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Model Validation - Annual Flow
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Guadalupe River
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Model Validation - Daily Flow
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Guadalupe River
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Model Validation - Hourly Flow
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Guadalupe River
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Summary of Model Performance
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• Captures general watershed hydrology
• Captures storm events
• Needs improvement for
• Annual flow volume
• Base flow
• Storm event peak flow and timing

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Model Improvement Plan
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• Extend calibration period
• Add urban irrigation into model
• Revise imperviousness estimates
• Adjust meteorological segmentation
• Re-evaluate calibration parameters

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Model Application
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