Assessment of Reservoir Storage Capacity and Silt Deposition Using Advanced Instruments: A Case Study

Raghuchandra Garimella; Selva Balan M.; Sreekanth Sampath; Mahender Singh Bist; Jitendra Kumar Singh

Abstract

Reservoirs on the upstream side of sediment-laden river dams fill with sediment over time, lowering their storage capacity. This research focuses on advanced instrumentation techniques used to analyse storage capacity and estimate the quantity of sedimentation deposited in the reservoir at Kadana Dam, Kadana Village, Mahisagar District, Gujarat, India. During the research investigations, a multi-frequency acoustic system with frequencies of around 33 KHz and 210 KHz was employed to assess the reservoir bed level. In addition, Hypack was used to process the data. A Knudsen Chirp 3260 single-beam echo sounder with frequencies of about 3.5 KHz and 200 KHz was also employed to determine the reservoir's sub-bottom profile. MATLAB and Sonar Wiz Software were used to examine the sub-bottom survey data. During the results analysis, Surfer Software was used to generate 3D sections, contour maps, grid maps, isopach charts, and isoline maps. According to the findings, the current gross storage capacity at FRL 127.7 m is 1243.58 MCM, while the intended gross storage capacity is 1543 MCM. As a result, at an FRL of 127.7 m, there is a 19.40 percent loss in gross storage. The research also revealed that the annual rate of silt is 2.73 ham/100 sq. km/year.