Namgum – Ban Phao HPP is expected to locate on Nam Ngum river, in Ban Phao commune, Pakngum District, Vientiane Capital ,141 Km far from the dam site of NamNgum – Nanin HPP on the downstream and about 28 Km from confluence between NamNgum river and Mekong river toward the downstream. NamNgum - Ban Phao is about 50 Km from Vientiane Capital toward the Northeast.The catchment area of Nam ngum – Ban Phao  at dam site is 16,780 Km2. Normalwater level is 159 m and dead water level  is 158.5 m. Area of reservoir surface confirming to NWL is 24.92  km2. It is geographical coordinates are within:18°12'15" Northern Latitude and 103°00'30" longitude.