Potential Environmental Impacts Caused by Sedimentation at the Tambakboyo Retention Basin D.I.Yogyakarta to Fulfill the Needs For Watershed

Abstract

The use of the Tambakboyo Retention Basin for more than 10 years has led to sedimentation at the bottom of the reservoir due to precipitated particles that are transported along with the water flow. Sedimentation of this reservoir can have several impacts on the environment. This study aims to analyze the possible environmental impacts that could occur in the Tambakboyo Retention Basin through the results of an analysis of the sedimentation rate and volume of water availability that has been carried out in previous studies. The results of previous studies indicate that the sedimentation rate in the Tambakboyo Retention Basin is included in category I or very light. However, several impacts may occur if there is no management, including reduced reservoir water holding capacity, flood hazard, excessive soil enrichment, lack of water so that the reservoir is no longer useful, and can even damage the reservoir. Thus, sediment management efforts need to be carried out, including repairing open land (greening), dredging sediments in the reservoir, and building sediment traps upstream of the reservoir.