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Published byVerity Bradford Modified over 6 years ago
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Estimating Groundwater and Surface Water Interactions Using Groundwater Depth
August 29, 2017 Kirk Klausmeyer SENIOR SPATIAL DATA SCIENTIST
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SANDARD DEFINITION GROUNDWATER DEPTH
Interpolated value: Interpolated value: 10’ 10’ 10’ 10’ 10’ 10’
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HIGH DEFINITION GROUNDWATER DEPTH
Estimated value: 60’ – 50’ = 10’ Estimated values Variable elevation 60’ elevation 10’ 10’ 10’ 10’ 8’ 9’ 10’ 0’ 0’ 50’ elevation 50’ elevation -5’
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HIGH DEFINITION GROUNDWATER DEPTH METHOD
Land Surface Elevation minus Groundwater Elevation = High Definition Groundwater Depth
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Mapping Groundwater and Surface Water Interconnection
0’ 20’ 50’ River Gaining Inter- connected Surface Water Mapping Interconnection based on High Definition Groundwater Depth Losing Uncertain Depth below land surface or top of surface water Likely Disconnected
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Groundwater depth based on Spring 2017 levels
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Groundwater depth based on Spring 2017 levels
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Groundwater depth based on Spring 2017 levels
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Groundwater depth based on Spring 2017 levels
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Sacramento Valley Maps
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San Joaquin Valley Maps
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UC DAVIS STUDY CONCLUSIONS
Bear River and Feather River Mostly losing ( ) Yuba River Mostly gaining ( )
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Based on Digital Elevation Model, not river surface elevation (stage)
LIMITATIONS Based on Digital Elevation Model, not river surface elevation (stage) Does not account for perched aquifers Requires some interpolation of groundwater elevation data
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