Simulation of Water Losses Control in Dam From the Evaporation by Aquatic Plants Application (Case Study Wonogiri Dam)

Abstract

Indonesia’s Economic and population growth increase the demand of the water supply especially for drinking water, industry, irrigation, and energy. The water conflict regard to the supply will affect the dam operation in order to fill the demand. Based on that problem, study about efficiency of the water losses in the dam need consider about evaporation beside the others. This study aim is to evaluate the aquatic plants such as (Hyacinth, torpedo grass, and duckweed) ability to reduce water losses through evaporation. Crop Coefficients (K_c) were obtained and water loss from evaporation was calculated by evapotranspiration (ET_c). Results presented the aquatic plants able to reduce the water losses from the evaporation in the dam. The duckweed can reduced the water losses by around 40% meanwhile Hyacinth and torpedo grass can reduced the water losses by around 27% and 29% respectively. Total water losses that duckweed can reduced is 1.319.354 m3, Hyacinth is 883.388 m³ and torpedo grass is 938.661 m³