The innovative operation of Imha Reservoir

Imha Reservoir has both a water transfer tunnel connecting Andong and selective withdrawal facility (SWF), which enable the innovative operation of reservoir. Although these facilities had not been equipped when constructed in 1993, structural measures were applied afterward as needed for effective reservoir operation. The was 2015 to minimize spillway discharge during floods by moving other with free space. SWF installed 2006 address problems due persistent turbidity Reservoir. effectiveness demonstrated through operational cases October 2019, while some improvements non-structural derived simultaneously. To prevent damage fish ecosystem reservoir, currently operated one-way movement. However, two-way movement should be allowed designed mid long term. effectively based on prediction fate transport turbid inside using CE-QUAL-W2. Nevertheless, more action procedures are required, such setting clear criteria release timing water, predicting downstream variations, etc.