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

Water Budgets and Modeling KGA Coordination Committee Meeting

CA Water Foundation

DRAFT

DRAFT

Focus on current and historical budgets first Must cover entire subbasin

GSP Requirements

DRAFT

DRAFT

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

DRAFT

• Develop WB data at the agency level
• KCWA Improvement District No. 4 (ID4)
• City of Bakersfield Water Resources
• Kern Delta Water District
• Incorporate additional agencies/areas:
• Cal Water, Greenfield County WD, East Niles CSD,

NOR/OMWC, Berrenda Mesa, Rosedale Ranch ID, Vaughn WC, Lamont CSD, Kern County, other pumping or wastewater; additional “white areas”

• Combine for a KRGSA Water Budget
• Groundwater and Surface Water
• Document space and time

KRGSA

Water Budget Smaller Entities water budgets Larger Agency water budgets

DRAFT

• Inflows to WPP
• Banking outside
• f KRGSA
• In-District

Recharge

• Recovery pumping
• Private in-district

pumping

• Treated water

deliveries

DRAFT

Inflows:

• Managed Recharge
• Urban Return Flows
• Treated wastewater recharge

and irrigation return flows

• Precipitation infiltration
• Stormwater conservation

Outflows

• Municipal and Recovery

pumping

DRAFT

• Kern River diversions

for treatment and use

• Kern River deliveries
• utside KRGSA
• Treated SWP from

ID4

• Agricultural ET demand from

METRIC ET data

• Diversions and managed

recharge from District and KR Annual Reports

• ET demand not met by

surface water assumed pumped from groundwater

• Dairies and food processing

pump groundwater, consume small amounts, then recirculate for irrigation and recharge

DRAFT

Banking imports and exports

SWP Imported Water

 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

 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

Update Managed Water Supply and Demand Data

Evapotranspiration (ET) inches DRAFT

 Monthly data

1994-2015 (except 2012)

 Use for Irrigated

Agriculture

 Assign ET

averages to 21 crop types in each of 3 subregions

 Map crops to

model elements (can map multiple crops/element)

METRIC ET Annual Average 2014

 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

• n 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

DRAFT

 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

• ther processes and simulates

 Flow through aquifers  Groundwater pumping (unless

designated)

 Subsidence

 Groundwater budget tracks:

 Volume for each inflow and

• utflow component

 Storage change over time  Change in groundwater levels DRAFT

DRAFT

DRAFT

DRAFT

DRAFT