GIS-Based Method for Estimating Storage Change Sample Clauses

GIS-Based Method for Estimating Storage Change. For any given GSA, the change in groundwater storage can be estimated using the following equation: Vw = the volume of groundwater storage change (acre-ft). Sy = specific yield of aquifer sediments (unitless). A = the surface area of the aquifer within the Tule Subbasin/GSA (acres). Δh = the change in hydraulic head (i.e. groundwater level) (feet). Vw = SyA Δh Where: The change in storage estimate is specific to the shallow aquifer as the groundwater level in the deep aquifer will not likely drop below the top of the aquifer. The calculations will be made using a Geographic Information System (GIS) map of the Tule Subbasin/GSA that will be discretized into 300-foot by 300-foot grids to allow for spatial representation of aquifer specific yield and groundwater level change. The areal and vertical distribution of specific yield for the shallow aquifer will be based on the values obtained from the calibrated groundwater flow model of the Tule Subbasin. For the areal distribution of change in hydraulic head within the Tule Subbasin/GSA, groundwater contours for the spring of the previous year will be digitized and overlain on the grid map of the Tule Subbasin/GSA in GIS. Groundwater levels will then be assigned to each grid. A contour map with groundwater elevation contours from spring of the next year will also be digitized and overlain on the grid map. Change in hydraulic head (groundwater level) at each grid will be calculated as the difference in groundwater level between the two years. The complete GIS files of specific yield and groundwater levels will be exported into a spreadsheet program for the final analysis of groundwater storage change. The change in groundwater storage will be calculated for each grid cell by multiplying the change in groundwater level by the specific yield and then by the area of the cell. The data from the analysis can be used to develop change in storage maps for incorporation into the annual reports.
Sample 1
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