1 Hydraulic and Sediment Handling Performance Assessment of Rani Jamara Kulariya Irrigation Project RJKIP by Conjunctive Use of 1 D and 3 D Simulation Models
Many water resources related hydraulic structures have been suffering economical loss due to poor performance of the designed components. In depth study of the design must be done before implementation of such projects. The main objective of this study was to check the hydraulic capacity and behavior of the head/works of Rani Jamara Kulariya Irrigation Project under inflow conditions of high concentration of sediments together with the design discharge. Possible changes in design, without decrease of the performance, were checked, to see if the project could be economized. A one dimensional model HECRAS (version 4.1.0) was used for the major portion of the study and a three dimensional model SSIIM (version 1) was used in the analysis of the settling basin. The results were then compared. The results suggest that the flow capacity of the system could decrease to 71 m/s from the designed capacity of 80 m/s when checked under 'minimum sustained river water level' conditions at the head/works. The sediment simulation in HEC RAS showed that, all particles of size greater than or equal to 0.125 mm would be trapped in the settling basin. For intermittent flushing mechanism, the D50 of active particles downstream of the settling basin was found to be 0.030 mm whereas the size was found to be 0.035 mm for continuous flushing (with a flushing discharge of 20 m/s) Other scenarios of operations along with some design modifications to the settling basin were checked in HEC RAS. Further, the hydraulic and sediment studies were done for the settling basin using SSIIM by which the flow vectors, flow velocities and trap efficiency valuess were studied.