Theme-8-4-Prediction of the effects of ground water abstraction on low flows in a Moraine catchment.

Abstract

A distributed groundwater/surface water model is described. Being a physically-based description of the entire land phase of the hydrological cycle, the model is the result of an integration of an integrated finite difference groundwater model, an aquitard model, a model for unconfined phreatic aquifers and a root zone model. The main objective of the model has been to make possible predictions of the hydrological consequences of groundwater abstraction on the river discharges and on the hydraulic heads of the aquifers. There- fore, special attention is given to the interaction between the streams and the aquifers. The model has been thoroughly tested against field data of streamflow, actual evapotranspiration, soil moisture deficit, drain water discharges and hydraulic heads of the confined aquifer. The paper gives a model description and a presentation of a case study of model application from a catchment in Denmark.