Comments (0) Practical technique for mapping surface fractures at regional scales is shown. On ArcView, modified Digital Elevation Model (DEM) dataset generate fascinating images that reveals structural features in western side of the Sierra Nevada. Nine wells, drilled on the inferred fractures, produced a satisfactory water discharge. Continue reading 'Mapping surface fractures on the Sierra Nevada, using GIS'»
In Fresno-Clovis area, wells that tap water on relatively similar depth varies greatly in their yield; from about 500 gpm to 2,000 gpm. This article shows a practical method to locate an area, where high yield water well can be expected. Continue reading 'Locating high-yield well in alluvial aquifer: Fresno-Clovis area'»
Simple solutions for the constant-head pumping test result are discussed, based on the Birsoy-Summer’s and the Jacob-Lohman’s equations. Transmissivity from pumping data is compared to recovery’s for validation purpose. Continue reading 'Transmissivity from long-term pumping test at a hard-rock aquifer'»
Three pumping test methods (step-drawdown, constant-discharge, and constant-head/ constant-drawdown) are compared for their suitability for aquifer test at a hardrock aquifer. Continue reading 'Comparison of different pumping tests on hard-rock / crystalline aquifer'»
Some groundwater models for Central Valley and their cities in California use deep percolation of precipitation on the valley floor as a significant source of recharge. One important aspect that these models somehow neglect is the present of hardpan soil layer. Continue reading 'Hardpan in the Central Valley: Its effect on groundwater model'»
If one drill to certain depth and the well does not bring intended discharge, is it worth to drill deeper or should just make a new well? What yield can be expected from a well? These are questions that well driller and owner usually find when drilling water well in a hardrock area. To answer these, about 900 wells at the foothill area of Sierra Nevada, California are explored. Continue reading 'Drilling on hard-rock aquifer: foothills of the Sierra Nevada'»
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