Sermo Reservoir Capability to Perform its Function

Abstract

The function of Senno Reservoir is fulfilling drinking water, river maintenance and irrigation demand as an additional supply on irrigation area of Pengasih, Pekik Jamal, and Clereng. The Irrigation area is part of the Kalibawang Irrigation System that gets water supply from Progo River. Based on the research that has been done the supply of Progo River has been reduced. Thereby the supply of Senno Reservoir is very necessary to meet the needs of irrigation. However, irrigation water from the Senno Reservoir is planned only for additional supply, so it is impossible to meet all the irrigation water demand. Especially with a condition of the reservoir effective storage that has been reduced due to sedimentation. In order to avoid conflicts in serving the needs of irrigation water, it must be clearly known how large the area of irrigation area can be served from the Sermo Reservoir. In this research was being simulated operation of a reservoir with a various scenario of cropping pattern, planting area and the initial condition of reservoir storage. The aim is to obtain the area of irrigation that can be irrigated by Senno Reservoir which the distribution of irrigation water supply in each planting season are stable. The results obtained 100% reliability in all planting seasons and various initial conditions of reservoir storage when used CPP2 planting pattern and the irrigated area is Pengasih with a service area of 0.51 % (1,038 ha).