Page - 1217 - in Book of Full Papers - Symposium Hydro Engineering

removing the PAR in the red and yellow areas but as long as it is difficult, risk reduction efforts can be made by further intensifying the three main points of the parameters: anticipation of dam disasters, preparedness to evacuate and the readiness of the evacuation site and post-disaster handling. If PAR is assisted by the relevant agency is deemed ready for disaster, then the red and yellow color can be changed to blue. Under these conditions, the PAR assessments at the downstream of the dam in MIM can be reduced again with the consideration that PAR together with the anticipated agencies anticipating the disaster has been deemed ready to face the dam disaster that can happen at any time. 3.7 Improving Modified ICOLD Method With LoL Index In the Modified ICOLD Method, the PAR evacuation requirements at the downstream of the dam have a point 18 (Extreme) where PAR > 250,000 persons, 12 (High) for PAR between 10,000 to 250,000 and 8 (Moderate) for PAR between 1 to 10,000 persons. This condition makes the big dams in Indonesia have high and even extreme categories which gives the impression that it is difficult to reduce the risk level because for the condition of Indonesia, risk assessment with the current condition up to 0 (Low) assessment is difficult to achieve given the increase and mobility of people in Indonesia. so high that it tends to ignore the safety due to future dam breakthroughs. If based on the regression graph that has been created for the condition in Indonesia can be predicted the number of LoL and anticipation can be done to accommodate the amount of LoL it can be said that the result of the assessment that the dam in extreme conditions for example can be proposed down to condition point 6 (Moderate) for PAR between 1 to 10.000 persons. Especially if long and short term action programs are implemented intensively to manage downstream areas of dams at the time of the dam is still standing well, it is not impossible to be reduced to moderate category even though the number of PAR is in the high category and even extreme. The results of this thinking are proposed in order to accompany the action of parallel intensive monitoring of conditions on the dam structure itself. The regression charts that were previously featured in the ICOLD 2017 Symposium in Prague last year are presented as follows: Fig 5 . PENRIS/PAR vs LoL for 3 Dams in Indonesia 1217