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- W2035719281 abstract "Hydrogen (D/H) and oxygen (O18O16) isotopic ratios were measured in precipitation-, lake-, stream- and well-water samples collected from the Lower Maner Basin, Andhra Pradesh, India, during 1976 and 1977. Granites, sandstones, quartzites and shales comprise the main lithological units exposed in the basin, which has a semi-arid climate and an average annual rainfall of 1000 mm. The basin is characterized by lakes and tanks of varying capacities. Isotopic data on precipitation samples gave a meteoric water line for the Lower Maner Basin, having a slope which is slightly different from that of the characteristic global meteoric water line. This marginal deviation may be due to the local evaporation effect on rain drops. Isotopic ratios of November 1976 and May 1977 lake-water samples show a considerable relative enrichment in the latter samples due to evaporation. Similar sample pairs from wells show no such enrichment trend, thus indicating absence of the evaporation effect on water which has reached the zone of saturation. Groundwater samples show enrichment with respect to the weighted mean isotopic ratios for precipitation. The extent of enrichment was found to vary with the recharge characteristics of various soil and rock types in the basin. The groundwater samples could be classified, upon the basis of their isotopic ratios, into two types. This classification agrees approximately with the lithological classification. Only one of the various tributaries of the Maner River, namely the Maruvancha Stream, is perennial. Isotopic data indicate that this perennial nature is due to return flow of lake waters through irrigation. The relative contribution of surface and groundwater to the discharge in this stream, during a low-flow month, was calculated from isotopic ratio values and found to be 80% and 20%, respectively." @default.
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- W2035719281 date "1982-11-01" @default.
- W2035719281 modified "2023-09-25" @default.
- W2035719281 title "Stable-isotope geohydrology of the Lower Maner Basin, Andhra Pradesh, India" @default.
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- W2035719281 doi "https://doi.org/10.1016/0022-1694(82)90094-4" @default.
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