Estimation of specific yields of individual litho-units in a terrain with multiple litho-units: A water balance approach |
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Authors: | Ranjan Kumar Ray Arunangshu Mukherjee Rumi Mukherjee |
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Affiliation: | 1. Central Ground Water Board, Ministry of Water Resources, Govt. of India, Bhujal Bhawan, Faridabad, Haryana, India
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Abstract: | In a terrain with more than one litho-unit, the traditional water balance approach provides a single spatially averaged specific yield. A methodology is proposed here, which can be applied to estimate specific yields of individual litho-units in such terrains. This approach is demonstrated here considering two watersheds, which are covered partly by limestone and partly by sandstone. Watershed wise specific yields were estimated using a traditional water balance method. The specific yields thus obtained are the volume-weighted averages of the specific yields of the individual litho-units in the watersheds. Based on the volumes of aquifers desaturated and the watershed wise specific yield values, a set of two linear equations in two variables was formulated. These linear equations were solved to get the specific yields of the individual litho-units. Specific yields of sandstone (Chandarpur Group) and limestone (Charmuria Formation) units in the study area were thus estimated to be 0.004 and 0.037 respectively. |
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