Mountains in the Chaning World, Mountains in the Chaning World

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STUDY ON STREAM BANK EROSION AND STABILITY STATUS OF THE GODAVARI KHOLA, SOUTHEAST KATHMANDU BASIN, CENTRAL NEPAL
ujwal kumar maskey

Last modified: 2017-08-24

Abstract


The fifth order Godavari Khola is flowing from the south to north direction and is one of the major tributary of the Hanumante Khola. As the urbanization is growing in the Kathmandu Valley the banks of the river are being targeted for the housing and roads, so it is important to know the characteristic of the river behavior and its nature. This study presents the morphology of the river, stream bank erosion and stability status of the Godavari Khola and it is conducted by studying different parameters like planform geometry, cross-sectional characteristic, hydraulic parameters, BELI, recession rate, bank erosion rate and sediment budget

The Godavari Khola have high bank erosibility and lateral instability as the hazard level of BELI and W/D ratio are high. Since the slope and the bankfull depth exceeds the critical slope and critical depth value respectively, the Godavari Khola is competent enough to mobilize the channel sediments. The Godavari Khola have both aggrading and the degrading condition. Similar to the other river of the Kathmandu Valley, the Godavari Khola is very disturbed by the anthropogenic activities. Low riparian vegetation is one of the major cause for the high bank erosion and instability of the Godavari Khola. The apparent recession rate of the Godavari Khola is 0.66m per year yielding 85m3 volume of the displaced material which weighs 141 tons. The estimated bank erosion rate from Prosser (2003) is in between 0.02 to 0.235 m/y and the sediment budget is estimated to be 320 tons per year.


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