Abstract:
Estimation of runoff volume and sediment yield is a problem that directly affects the
performance of dams due to the reduction in the storage capacity of their reservoirs and their
effect on dam efficiency and operation schedule. The simulation models can be considered for
evaluation of sediment potential if the continuous field measurements are not available. Soil
and Water Assessment Tool (SWAT) was applied to estimate the annual runoff volume and
sediment load for Ayserawum micro earth dam watershed area by transferring model
parameter from Andit tid watershed. Six most sensitive parameters were identified for stream
flow and ten for sediment load. During the course of calibration of stream flow, the
performance indicators were found as R2 = 0.89, ENS = 0.85 and D =+8.58 and for validation
R2 = 0.79, ENS = 0.73 and D =+5.32, and for sediment load R2 = 0.77, ENS= 0.73 and D =+12
for calibration and R2 =0.76, ENS = 0.73 and D =+17.5 for validation. Simulation output of
the 36 sub watersheds was contributed varying degree of average annually stream flow of 0.38
m3/sec to 0.01 m3/sec, and sediment load 297.64 to 1.85 tons/ha/yr. Based on the hydrological
simulation integrated watershed management plan should be implemented for effective land
and water resource development. Hence, the result of the study could help stakeholders to
plan and implement appropriate soil and water conservation strategies in the hot spots area.
