Upper Kotmale Hydropower Project (UKHP) is a ‘run of the river’ hydropower project, in the upper reaches of Kotmale Oya in the Mahaweli River Basin (Sri Lanka), with an installed capacity of 150MW (400GWh/year). The project is funded by Government of Japan. Mitsubishi Corporation (MC) is one of the contractors who in turn commissioned LHI to undertake specific studies.
A flood forecasting and warning system is proposed to be established as a part of the project. The Flood Forecasting Program aims at monitoring the actual inflow, and predicting the future inflow/flood into the Intake Dam for the effective spillway gate operation and data logging. Further, the warning system is expected to issue in advance alerts to people at downstream of the intake dam and in Talawakele town, in the event of a sharp rise of intake water level resulting from the flash flood inflow into the intake.
The Flood Forecasting Program (FFP) was developed with the use of MIKE 11 Real – Time Modeling software package. LHI also collected historical data and carried out river cross section surveys in a precursor to setting up and simulation of the hydrological (rainfall runoff) and hydraulic (river routing) models.
LHI’s work include setting up, calibration, verification, and simulation of the models using MIKE 11 NAM & MIKE 11 HD. The Flood Forecasting (FF) and MIKE FLOOD WATCH system will be setup at the site by Danish Hydraulic Institute (DHI). A telemeter system has already been established that comprises five rainfall gauging stations and three water level/discharge gauging stations. The system will work in Real Time Environment.