TR-86 : Interaction of large water bodies with aquifer

Abstract

The transient analysis of flow around a large water body of square cross-section and having uniform depth has been analyzed. Hypothetical setting of boundaries were assumed, i.e., rivers on the lateral sides of the water body and no flow boundaries at the other two sides. Both type of boundaries were assumed to be at equal distance from the centre of the water body. A three dimensional groundwater flow model has been adopted for the analysis of flow from large water body. Similarity approach has been employed to develop type curves which enables the assessment of the rate of recharge from water body, knowing the variation in the observed head in an observation well situated within the influence area of the water body. Correlation between different type-curves pertaining to different sizes of water bodies and for different hydraulic conductivities have also been presented. The effect of variation of K h/Kv (here, Kh and K v are the hydraulic conductivities in horizontal and vertical direction respectively) on the type curve has been analyzed.