DECISION SUPPORT TOOL FOR THE WALKER RIVER BASIN Greg Pohll March 29, 2015 Walker Lake | Credit: Jeff Gersh (Narrative Labs)
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DECISION SUPPORT TOOL FOR THE WALKER RIVER BASIN
Greg Pohll March 29, 2015
Walker Lake | Credit: Jeff Gersh (Narrative Labs)
March 29, 2016 2
March 29, 2016 3
Walker Basin
March 29, 2016 4
March 29, 2016 5
The Walker Basin Restoration Program (WBRP) was established by Public Law 111-85 (2009) for the primary purpose of restoring and maintaining Walker Lake, and to protect agricultural, environmental and habitat interests in the Walker Basin consistent with that primary purpose.
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PRMS models of headwater areas (Supply Side)
MODSIM River Basin Management system
MODFLOW models for Mason, Smith, & lower Walker (Demand Side)
Economics Model Lake M
odel
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River Inflows
River Outflows
HRUs
Surface Diversions
Ditch Leakage
Return Flows
Irrigation Recharge
Groundwater System
Stream & Drain Flow Exchange with Groundwater
Non-Ag ET (lost from system)
River/Drain Network
Crop ET (lost from system)
Groundwater Pumping
(Storage) Interbasin Groundwater flow
Interbasin Groundwater flow
Mtn Block Recharge
y = 0.3211x - 857.69 R² = 0.7096
-
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
0 20,000 40,000 60,000 80,000 100,000 120,000
Net
Acc
retio
n/D
eple
tion
(acr
e-ft/
yr)
Previous Year Groundwater Pumping Volume (acre-ft/yr)
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Groundwater Models
Mason Valley
Smith Valley
Bridgeport
East Walker
Lower Walker
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Walker Lake Predictions
Data Collection
March 29, 2016 DRI – Science. Environment. Solutions.
River discharge Groundwater levels Lake stage and TDS concentration TDS loading to Walker Lake
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