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GSP Annual Report

5-022.06 MADERA
2021 (OCT. 2020 - SEP. 2021)
Multiple Annual Reports
GSP Local ID: Madera Subbasin Joint GSP

GSP Annual Report Information Comments

04/01/2022 3:42 PM

2021 (OCT. 2020 - SEP. 2021)

Multiple Annual Reports
John Davids (Davids Engineering, Inc.)

A Groundwater Extraction

Total Groundwater Extractions (AF)

542,760

Water Use Sectors

38,920
0
503,840
0
0
0
0
      
        

B Groundwater Extraction Methods

Meters

14,085
Direct
5-10 %
Groundwater wells operated by the City of Madera for urban water use are 100% metered. The City's potable water supplies are exclusively from groundwater, which is pumped directly into the distribution system to meet demands in the Urban Water Use Sector (City of Madera GSA).
Madera Water District operates agricultural groundwater wells that are also 100% metered. Groundwater pumped from these wells serve demands in the Agricultural Water Use Sector (Madera Water District GSA).
Estimated based on the typical field accuracy of meters, and the combined accuracy of volumes in distribution systems (accounting for metered groundwater, metered deliveries, unmetered deliveries, and apparent losses)

Electrical Records

0

        

        

Land Use

528,680
Estimate
20-30 %
Calculated as the closure of a Land Surface System water budget for the Madera Joint GSP GSAs area (closure of each water use sector was calculated separately for each GSA, accounting for measured pumping in the City of Madera and Madera Water District). All other Land Surface System water budget components were quantified using measured volumes (where available) or using unitized IWFM Demand Calculator (IDC) model results multiplied by land use areas. Land use data was developed from Land IQ data, crop reports, and County Agriculture Commission land use data.
Typical uncertainty when calculated for Land Surface System water balance closure. Uncertainty of the water budget closure is calculated as the combined uncertainty of all other water budget flow paths following the procedure described by Clemmens and Burt (1997), as discussed in the Annual Report. The uncertainties of all other flow paths are quantified based on measurement device accuracy, technical literature, or professional judgment.

Groundwater Model

0

        

        

Other

0

        

        

C Surface Water Supply

Total Surface Water Supply (AF)

45,500

Methods Used to Determine

CVP Supplies and Local Supplies:
Calculated as the difference between Surface Water Inflows and Surface Water Outflows, by water source type (at this time, surface water reuse is not a significant source of supply in the Plan area).  This assumes that the Surface Water Supply that is "used or available for use" includes all water that is diverted, infiltrated, or evaporated from waterways in the Plan area.

Surface Water Inflows and Surface Water Outflows in the Plan area were directly measured (where a recorder or streamflow measurement station is available) or estimated through a waterway balance based on available records of diversions and spillage, and estimates of seepage, evaporation, and runoff (using waterway attributes from GIS analyses and NRCS soils data, and runoff calculated in an IWFM Demand Calculator (IDC) model).

Water Source Types

22,600
0
0
22,900
0
0
0
0

        

D Total Water Use

Total Water Use (AF)

612,870

Methods Used to Determine

Total Water Use is assumed to be the total volume of water that is applied to land surfaces or that precipitates onto land surfaces. A portion of this water is consumptively "used" through evapotranspiration/evaporation. The remaining water is "used" to recharge the Subbasin through deep percolation and seepage of runoff. Groundwater is determined following the methods described in Part B. Surface water is determined from delivery records (from Districts) and riparian diversion reports (eWRIMS). Precipitation is determined from PRISM data.

Water Source Types

542,770
27,820
0
0
42,280
Precipitation

Water Use Sectors

44,320
0
557,500
0
0
11,050
0

        

E Change in Storage


Method used to calculate change in storage

To calculate annual change in groundwater storage from the groundwater level contour maps, the difference in groundwater elevation between annual spring contour maps was calculated for each of the principal aquifers (Upper and Lower Aquifers). Both confined and unconfined groundwater conditions occur within the Subbasin. To accurately estimate change in groundwater storage from changes in groundwater levels, it is important to differentiate areas of confined groundwater conditions from unconfined conditions. Accordingly, the groundwater elevation data were reviewed to estimate an area over which the Lower Aquifer exhibits confined conditions and where the groundwater levels are representative of a potentiometric surface. This was done by comparing groundwater elevations to the elevation of the bottom of the Corcoran Clay confining geologic unit. The extent of the area where groundwater elevations in the Lower Aquifer occur above the bottom of the Corcoran Clay was delineated as the area of confined groundwater conditions for the purpose of calculating change in groundwater storage. 
Outside of the delineated confined area, changes in groundwater levels (in both the Upper and Lower Aquifers) were multiplied by representative specific yield values to estimate change in groundwater storage. Within the delineated area of confinement in the Lower Aquifer, groundwater potentiometric surface changes in the Lower Aquifer were multiplied by a much smaller storage coefficient value to calculate annual changes in groundwater storage in the Lower Aquifer. The specific yield and storage coefficient values used in the analysis are derived from values in the calibrated integrated groundwater flow model (MCSim) developed and applied during the preparation of the GSP.

F Monitoring Network Module

SGMA Wells Elevation Readings Export (CSV)


General Sites Elevation Readings Export (CSV)