TR-69 : Effect of surface water groundwater interaction on routing characteristics

Abstract

In alluvial rivers the phenomena of water exchange between aquifer and stream is very common. The flow from or into the stream decrease or increases the quantity of water flowing in the stream which effects the routing process. A program has been developed by USGS for stream flow routing taking into account the quantity of flow from or in to stream . In this study this program has been applied to flood data of River Tapti for the reach Hathnur to Gidhade. A sensitivity analysis has also been made. The storage coefficient, transmissivity, wave celerity, width of the aquifer for finite aquifer and the retardation coefficient for the case when the aquifer is semi-infinite and the stream is separated from the aquifer by a confining bed, should be selected very carefully for the successful application of the model. Further it can be concluded that the model is more suitable for the situation when lean flow occurs in the stream to have significant storage in the aquifer in comparison to the flow in the stream and a distinct effect on routing.