• Su Su Hlaing
• Zin Mar Lar Tin San
• Win Win Zin
• Cho Cho Thin Kyi
• John Conallin

The alteration in river flow regimes by human activities is a key impact on riverine ecosystem. This study focus to check how flow regime was changed from natural flow due to reservoir operation systems. HEC-ResSim model was used to simulate the reservoir system under the alternative scenarios and RVA analysis by 33 indicators of hydrologic alteration was used for the determination of flow regime alteration. To investigate the flow alteration analysis, the case study is Myitnge river downstream from Yeywa hydropower reservoir. The alteration analysis was done by the reservoir operations under the existing policy and under the environmental flow restriction. The existing operation system leads to moderately change in the natural flow regime. When the environmental flow constraint was considered in the operation system, the hydrologic alteration degree could be reduced by 5.73 % and moreover the power production was becoming increase to 1.3 % than the existing production. The result indicates that the reservoir operation system that provides the environmental flow can perform the closet natural flow regime for the ecosystem integrity while increasing the energy generation.

Hydrologic alteration,HEC-ResSim,environmental flow,RVA,Myitnge river

"Assessment of Hydrologic Alteration due to Hydropower Reservoir Operation System", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.1047-1054, June 2019, Available :http://www.jetir.org/papers/JETIR1907452.pdf

"Assessment of Hydrologic Alteration due to Hydropower Reservoir Operation System", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp1047-1054, June 2019, Available at : http://www.jetir.org/papers/JETIR1907452.pdf