Water Budgets and Modeling KGA Coordination Committee Meeting CA - PowerPoint PPT Presentation

Water Budgets and Modeling KGA Coordination Committee Meeting

CA Water Foundation DRAFT

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GSP Requirements Focus on current and historical budgets first Must cover entire subbasin DRAFT

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KRGSA Water Budgets - GSP • Develop inflows and outflows for WB zones in KRGSA (without subsurface inflows and outflows) • Scale up to a KRGSA Water Budget for the GSP Subbasin Water Budgets - Groundwater Model • Incorporate water budgets into the Subbasin groundwater model • Combine with other subbasin water budget data • Use model for Subbasin Water Budget; KRGSA using model to estimate local subsurface inflows and outflows DRAFT

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• Develop WB data at the agency level • KCWA Improvement District No. 4 (ID4) • City of Bakersfield Water Resources KRGSA Water • Kern Delta Water District Budget • Incorporate additional agencies/areas: • Cal Water, Greenfield County WD, East Niles CSD, Smaller Entities NOR/OMWC, Berrenda Mesa, Rosedale Ranch ID, water budgets Vaughn WC, Lamont CSD, Kern County, other pumping or wastewater; additional “white areas” Larger Agency water budgets • Combine for a KRGSA Water Budget • Groundwater and Surface Water • Document space and time DRAFT

• Inflows to WPP • Banking outside of KRGSA • In-District Recharge • Recovery pumping • Private in-district pumping • Treated water deliveries DRAFT

Kern River diversions • for treatment and use Kern River deliveries • outside KRGSA Treated SWP from • ID4 Inflows: Managed Recharge • Urban Return Flows • Treated wastewater recharge • and irrigation return flows Precipitation infiltration • Stormwater conservation • Outflows • Municipal and Recovery pumping DRAFT

SWP Imported Water • Agricultural ET demand from METRIC ET data • Diversions and managed recharge from District and KR Annual Reports • ET demand not met by Banking surface water assumed imports and pumped from groundwater exports • Dairies and food processing pump groundwater, consume small amounts, then recirculate for irrigation and recharge DRAFT

 C2VSim – DWR regional planning model released May 2018  Use C2VSim model for subbasin water budget analysis  Revise managed water supply and demand data with local subbasin data  Maintain current model structure (layers and properties)  Incorporate other existing data already in the C2VSim (e.g., soils) DRAFT

Update Managed Water Supply and Demand Data  Surface water diversions by water district  Groundwater banking and recharge programs  Groundwater banking recovery for in-basin use and export  M&I water use  Locally important water budget components  Crop demand based on METRIC ET data DRAFT

 Monthly data 1994-2015 (except 2012) METRIC ET  Use for Irrigated Annual Agriculture Average  Assign ET 2014 averages to 21 crop types in each of 3 subregions Evapotranspiration (ET)  Map crops to inches model elements (can map multiple crops/element) DRAFT

 Model simulates key hydrological processes  Surface Land and Water Use, Root Zone, and Unsaturated Zone  Surface water deliveries from rivers and canals  Groundwater flow  Focus on physical water  Where does the “wet water” go? (not paper exchanges)  Prevent “double-counting” DRAFT

 Automatically adjusts diversions and pumping to meet demands following user-defined rules  Uses surface water, groundwater, and precipitation to meet water demand for different land uses  Root Zone water budget tracks:  Surface runoff  Consumptive use  Deep percolation to groundwater DRAFT

 Calculates agricultural demand based on soil moisture budget  Monthly METRIC data used to generate crop ET time series to determine crop demand  Tracks change in soil moisture content throughout simulation  If soil moisture falls below minimum level (wilting point), irrigation water added to reach target level (field capacity) to cover ET, deep percolation and runoff DRAFT

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 Tracks surface water delivered for agricultural and urban use  Directs diversions to designated subareas  Each subarea provides for spatial distribution of agricultural and urban use  Surface Water budget tracks:  Diversions  River and canal seepage  Groundwater-surface water interactions  Natural inflows and outflows DRAFT

 Calculates runoff and inflow from adjacent small watersheds  Uses Soil Conservation Service methods for estimating runoff  Systematic method to track inflow from unmeasured watersheds  Small Watershed budget tracks  Surface water runoff into basin  Infiltration of runoff to groundwater  Subsurface inflow into basin DRAFT

 Groundwater process integrates the inflows and outflows from other processes and simulates  Flow through aquifers  Groundwater pumping (unless designated)  Subsidence  Groundwater budget tracks:  Volume for each inflow and outflow component  Storage change over time  Change in groundwater levels DRAFT

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