Use of Fracture Traces in Water Well Location: A Handbook

摘要

Fractures and faults often have subtle surface expressions that reveal their presence; based on this principle, competent well drillers/hydrogeologists/engineers have access to a scientifically-sound indirect means of locating the best spot to drill a successful well. The proper use of this technique, known as fracture trace analysis (FTA) is explained. The technique relies primarily on the use of aerial photographs to delineate the presence of subsurface fractures which may serve as conduits for groundwater flow. Covered are: basic groundwater hydrology; fundamentals of air photo interpretation; field application of fracture traces to water-well location; and the rating of drilling targets. Also considered are factors related to coordination with drilling contractors and hydrogeologic considerations influencing well yields.