TR(BR)-2/2006 : Estimation of sediment rates and pattern in sagar lake using Radiometric dating techniques

Abstract

Sagar lake is situated in the middle of the Sagar city at an elevation of 517 meters above mean sea level in the Vindhyan terrain of Bundelkhand region. Lake surface area is 145 ha at full tank level. The maximum depth is 5.3 meter. The maximum length and width of the lake are 1247 metres and 1207 metres, respectively. The lake mean depth is 2.69 metres. Volume of the lake is 389 ha-m. Catchment area of the lake is 1817 ha. Sedimentation rate and pattern in lake have been carried out using "7Cs and l'aPb radiometric dating techniques. Sedimentation rate in the lake varies between 0.14 to 1.68 cm/y depending upon the location in the lake. The mean sedimentation rate is 0.956 cm/y. In the present study, lake has been subdivided into eight zones on the basis of sedimentation rate and under water topography and the lake life has been estimated. The estimated life based on Post-1964 average sedimentation rate of the lake is around 467 years.