Field Methods for Estimating Drought Streamflow Reduction Due to Pumping from Nearby Wells

摘要

The objective of the research is to evaluate field methods for estimating streamflow reductions due to pumping from nearby wells. The project is a supplement to previous work which provided a microcomputer model for estimating streamflow depletion due to pumping from nearby wells. Four direct measurement techniques and one indirect estimation technique are described and evaluated for estimating induced recharge through stream bottoms for phreatic and confined aquifers. Direct techniques are seepometers, minipiezometers, temperature probes, and tracers. The indirect estimate is derived from streamflow correlations. Streamflow correlation estimates and tracers are not generally useful. Seepometers, minipiezometers, and temperature probes are useful for both phreatic and confined aquifers subject to certain bottom sediment and flow volume constraints.