PRELIMINARY Southwest Kings Groundwater Date: 7/11/2018 - - PowerPoint PPT Presentation

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PRELIMINARY Southwest Kings Groundwater Date: 7/11/2018 - - PowerPoint PPT Presentation

Feb 23, 2023 254 likes •414 views

Southwest Kings GSA Southwest Kings GSA Water Budget PRELIMINARY Southwest Kings Groundwater Date: 7/11/2018 Sustainability Agency Presented by: Joe Hopkins PRELIMINARY 2 Water Budget Purpose Summarize all water sources and uses

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Southwest Kings GSA

Southwest Kings GSA Water Budget

Date: 7/11/2018 Presented by: Joe Hopkins Southwest Kings Groundwater Sustainability Agency

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  • Summarize all water sources and uses

– Sources – Surface water, precipitation, groundwater – Uses – Irrigation, municipal, industrial

  • Summarize hydrological interactions

― Land Surface – Groundwater interactions

  • Recharge, pumping, deep percolation

― Land Surface – Atmosphere Interactions

  • Precipitation, evaporation, evapotranspiration
  • Compare to Basin-wide Model

― Period of Record: 1990-2016 to match AMEC’s model

Water Budget Purpose

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Water Budget Diagram

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Data Sources

  • Farmers/Landowners

– Cropping data, pumping/irrigation data, water levels, water quality, system/operational data

  • Public Databases

― Water levels, precipitation, evapotranspiration, soils, historic land use/cropping

  • Publications

― Recharge rates, specific and sustainable yield, historic land and water use, deep percolation rates

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Southwest Kings GSA Water Budget Diagram

6 GSA 1990-2016 (9) (1) (10) (11) (8) (2) (12) (26) (25) (28) 58,200 AF 0 AF (13) 90,400 AF 74,600 AF 29,100 AF 0 AF 0 AF 100 AF 200 AF 6,700 AF 0 AF (27) 0 AF 29,100 AF (30) Irrigation Efficiency = 82% Agency Area = 89,689 Acres Irrigated Area =47,328 Acres 0 AF (15) (23) (16) (17) (20) (19) (22) (21) (18) 21,100 AF 13,100 AF 300 AF 0 AF 22,400 AF 0 AF 0 AF 100 AF 0 AF 0 AF 0 AF 0 AF 20,700 AF (3) (4) (5) (6) (24) (14) N/A 8,700 AF (inflow and outflows) (29) N/A N/A (change in groundwater levels) 0 AF Local Stream and River Recharge (7) Southwest Kings WATER BUDGET DIAGRAM Evap.- Reservoir/Basin Seepage - Reservoirs Seepage - Canal/Pipeline Other Supply: Other Consumptive Use: Other Losses: Deep Percolation - Precipitation Municipalities and Urban Areas Canals and Pipelines Operational Spills Groundwater Export Surface Water - M&I ET - M&I Recharge - Urban Stormwtr Reservoirs and Recharge Basins Change in Groundwater Storage Precipitation - Evap and Runoff Crop ET - Applied Water Spill Inflows GW Pumping - Private Irr. GW Pumping - M&I Private Groundwater Outflow Intentional Recharge Evaporation - Channels Deep Percolation - M&I Precipitation Groundwater Inflow Surface Water - Irrigation GW Pumping - Irr. Agency GrW Pumping - M&I Agency Deep Perc. - Irrigation Crop ET - Effective Prec. Agricultural Lands Other Recharge

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Output: Evapotranspiration

  • Evapotranspiration numbers were obtained

from ITRC – Wet, Dry, Average Water Year types

  • ITRC uses the CIMIS ET Zone Map
  • Southwest Kings GSA is located in Zone 16
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Southwest Kings GSA

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Output: Consumptive Use

  • Water Needs

– Irrigation

  • Cropping data was gathered

from growers and supplemented by USDA- Cropscape and DWR Survey

  • All crops are assumed mature

– Minor Domestic/Industrial

  • Limited data, assumed to be

negligible

– Municipal

  • Kettleman City Community

Services District: 300 AF/Year

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Water Sources

  • Groundwater (Output )

– Least used water source – Unmetered – Calculated using water budget spreadsheet

  • Precipitation (Input )

– Using Kettleman City CIMIS Station – Effective precipitation assumed to be 50% of annual precipitation

  • Surface Water (Input )

– Primary water source – Use data is still limited, some sources are not metered

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Inputs: Water Sources

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Inputs: Groundwater Recharge

  • Deep Percolation

– From Irrigation Systems – Overall irrigation was assumed to be 82% efficient on average, resulting in 18% of water deliveries going to deep percolation – From Precipitation – Assumed to be 0% of annual precipitation

  • The Williamson Method determined that annual precipitation of less than 9.69 inches in the Central Valley results

in no groundwater recharge (Williamson et al. 1989).

  • 7.77 inches average annual precipitation from 1990-2016 in Southwest Kings GSA (CIMIS, Kettleman Station)
  • Seepage

– Canals – Major canals assumed to have operated for 365 days/year – Pipelines – Assumed no leaks – Reservoirs – Negligible seepage contributions from DRWD 820 acres of ponds and RD 761 evaporation ponds

  • Limited percent of time filled
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Change in Groundwater Storage

  • Method

– Check Book Balance – Uses all inputs and outputs from Water Balance Workbook

  • Insufficient data to complete a

groundwater level/specific yield comparison

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Assumptions and Uncertainty

  • 1. Cropping Patterns

– Years with data gaps were filled with similar water year conditions’ data

  • 2. Groundwater Pumped

– Back-calculated in spreadsheet

  • 3. Surface Water Imports

– Years with data gaps were filled with similar water year conditions’ data

  • 4. Irrigation Methods
  • 5. Groundwater Inflows and Outflows
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Key Take-Aways

  • 1. SWKGSA is essentially in balance. 8,700 AF surplus
  • 2. Future efforts to inventory cropping, groundwater pumping,

surface water deliveries and irrigation methods will be helpful

  • 3. Seepage benefits from the channelized flow contributed almost

as much as deep percolation of residual irrigation water

  • 4. Will need to share this data with Wood to refine model
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