Comments (1) 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'»
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'»
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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