FORECASTING THE RISK OF FLOODING WHEN THE PAC CAP HYDROPOWER DAM BREAKS ON NA RI RIVER IN BAC KAN PROVINCE

Abstract

Pac Cap hydropower was approved investment policy in Decision No.96/QĐ-UBND dated 18/01/2018 on Na Ri River, Na Ri district, Bac Kan province with the capacity of 6MW. During the construction and operation of 02 units, dam breakdown can occur when the crests of dams, horizontal cracking and cracking along the dam, sliding roof upstream and downstream of the dam, etc. This study focused on simulation of breakage occurrence using the Mike Flood model. The results show that the largest flood depth would be over 10 meters with the flooded area of about 15 hectares, which is mainly land for annual crops, rice land and production forests; depth from 4 to 10 meters would occupy about 10 hectares; depth of 1 to 4 meters in addition to the forest land and inundated agricultural land would engulf about 30 houses in Luong Thanh and Lam Son communes of Na Ri district and some other infrastructure projects. The results of the study are the basis for introducing preventive measures to minimize the damage to the downstream area, as well as to determine the responsibility of the plant in the compensation process if the incident occurs.