Alternative Analysis of Selorejo Reservoir Sediment Control for Maintenance Cost Efficiency

The Selorejo Dam, which was completed in 1970, has experienced a high decline in storage capacity due to sedimentation rates from the upstream Konto river watershed. The maximum reservoir capacity in 1970 was 62.3 million m3 in 2017 to 30.72 million m3. Reservoir maintenance activities, in this case technical sediment control, have not been able to recover or maintain reservoir storage capacity, so alternative reservoir sediment control is needed that is able to maintain reservoir service life and is economically efficient. This research was conducted to analyze the effectiveness and efficiency of sediment control technically from 5 (five) alternatives proposed to be implemented in the Selorejo reservoir. The things considered in the alternative are sediment control volume and method, first according to the last condition carried out by reservoir organizer, next is addition of sediment control volume, and combination of sediment control with reservoir sediment dredging method, sabo dam sediment dredging and establishment check dams. Of the five alternatives proposed in cont