Assessment of trap efficiency of Dokan dam with different sediment management techniques using ResCon 2.2

Abstract

Dokan dam is one of the strategic dams in Iraq with third larger storage capacity, the importance of this project comes through the functions that were built for; irrigation, flood prevention, hydropower generation, and tourism. Even in the pre-implementation stage, the sediment study was not conducted to predict the storage through the life of the dam. The rate of the siltation processed is indicated as 3.8 million m3 /year. For reservoir sedimentation analysis, many factors should be identified like shape of the lake behind dam, trap efficiency (TE), rate of sedimentation, and sediment management process. Different sediment management techniques are used in this research to predict the trap efficiency of Dokan dam for up to 300 years of project life, the analysis of available data shows that TE of Dokan dam is 97% up to 2055; and ResCon 2.2 model shows that the best sediment management techniques which give higher TE are catchment management, by-pass, and trucking of about 95%, 96%, and 97% respectively. The selection of the best techniques will be address after examining economical and technical factors.