Estimation of 2002 Extreme Flood over Balkhu River Using NOAA Based Satellite Rainfall and HEC-HMS Hydrological Model, and Assessment of Flood Education of People Living Near the Flood Risk Zone of Balkhu River

Kathmandu Valley, the capital of Nepal, is situated at 4,423 ft. above the sea level. Kathmandu, Bhaktapur and Patan are the major towns in the valley. The Bagmati River is the principal river of the Kathmandu valley. Bagmati, fed by springs and monsoon rainfall, originates in the north of Kathmandu Valley (Shivapuri Hill) and a number of tributaries join the river as it flows down stream and passes through the valley at Chovar. Urban flooding in Nepal is much lightens up as the capital city Kathmandu valley got flooded badly with large death/missing of 27 people in 23 July, 2002. The satellite rainfall estimates (RFE) from NOAA and point rainfall shows high rainfall patches on 23rd July over Kathmandu Valley. Due to this rainfall, huge flood was also observed near oriental colony in Balkhu River. HEC- HMS model estimated 170 m3/s of flood in Balkhu River near the Oriental colony. In the same time, the maximum flow of Bagmati river at Khokana was 800 m3/s (DHM). Flood education survey result shows that the peopeople living 40m away from the river side are aware of the flood, but the resident of the colony i.e. within 40m shows lack of flood education even they are more educated.