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Comparison of irrigation pumpage and change in water storage of the High Plains Aquifer in Castro and Parmer counties, Texas, 1975-83

Water-Resources Investigations Report 87-4032

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Abstract

An understanding of the relationship between irrigation pumpage and change in groundwater storage was needed to quantify the amount of water returning to the High Plains aquifer as a result of intensive irrigation in Castro and Parmer Counties, Texas. Irrigation pumpage for the 9-yr period, 1975-83, was estimated by using the Blaney-Criddle consumptive-use formula adjusted by a factor to account for irrigation demand and field-measured crop applications. Total estimated pumpage for the 9-yr period was 11,269,000 acre-ft and 8,914,000 acre-ft. The estimated pumpage was based on reported crop acreage data and LANDSAT acreage data, respectively. Aquifer storage for the same period was estimated as the product of specific yield, net water level change, and area. Change in storage was 5,168,00 acre-ft. Many of the areas of the largest change in storage also were the areas of the largest saturated thickness. The only locations that did not experience substantial water level declines were the northwest and northeast parts of the study area. A comparison was made of water returning to the aquifer by calculating the difference between irrigation pumpage and the change in aquifer storage. Two estimates of this comparison, expressed as a percentage of irrigation pumpage, were obtained on the basis of two different sources of acreage data. This comparison was 54% of pumpage based on reported crop acreage data and 42% of pumpage based on LANDSAT interpreted acreage data. (Author 's abstract)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Comparison of irrigation pumpage and change in water storage of the High Plains Aquifer in Castro and Parmer counties, Texas, 1975-83
Series title:
Water-Resources Investigations Report
Series number:
87-4032
Edition:
-
Year Published:
1987
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
v, 48 p. :ill., maps ;28 cm.