CONSTRUCTION OF COFFER DAMS FOR FIGHTING FEROCIOUS KOSI
DOI:
https://doi.org/10.53555/eijse.v3i4.115Keywords:
Catchment, Watershed, Alluvial, Gorge, tributaries, confluence, sorrow of Bihar, erosion of soil, evidence of lateral channel shifting, KOsi barrage designed for peak discharge of 27,014 m3/s (954,000 cu ft/s), silt yield of about 19 m3/ha/year (10 cu yd/acre/yr, August, 2008, the devastating flood in Kosi, breaching of afflux bund, river in three streams, construction of three coffer dams, river trained in the main channel and barrage started functioningAbstract
Kosi River is an alluvial stream flows through Shivalih hill in Nepal & Tibet (China).It comes on the plane at Chatra about 45km North of Indo –Nepal border. There is a barrage on Indo-Nepal border at Bhim Nagar, Birpur in Supaul District of Bihar, Inia.Kosi River was devastating before it was tamed.In eighteen century it was flowing near Purnea town and shifted westward, now flowing near Supaul. It shifted about 120 km westward in 275 years.
This river is formed by the confluence of seven small streams flowing through Tibet a Nepal. These seven streams are – Indravati, Tamar Kosi, likhu Kosi, Doodh Kosi, Arun Kosi and Tama Kosi. It travels about 729 kms from source to confluence with Ganga in Kurshela.
Some hydraulic particulars of the rivers were:-
Design Discharge of Barrage -9, 50, 000 cusec
Max Discharge observed on 5th Oct 1968- 9,13,000 cusec( after construction of barrage)
Total No .of Gate- 46
On 16th Aug, 2008 there was a breach in eastern Kosi Afflux Bund of river Kosi In Nepal. The location of breach point was 13 m upstream from barrage. The river was flowing in three streams. Technical experts decided to construct three coffer dams to retrain the three streams into one and bring back the river river in main channel. it was on 24th Janurary,2008 on which the main flow of Kosi was stopped through bridge and diverted towards barrage through pilot channel. The barrage again stated functioning.
References
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. GIS in Flood Hazard Mapping: a case study of Kosi River Basin, India –
http://www.gisdevelopment.net/application/natural_hazards/floods/floods001pf.htm - By G.Venkata Bapalu, Rajiv Sinha
. Hydrology and phytoplankton populations in River Kosi of the western Himalaya(Uttar Pradesh) - Indian Journal of Ecology, 1985 - By SD Bhatt, Y Bisht, U Negi
. ANTHROPOGENIC, CLIMATIC, AND HYDROLOGIC TRENDS IN THE KOSI BASIN, HIMALAYA - By KESHAV P. SHARMA, BERRIEN MOORE III and CHARLES J. VOROSMARTY
. Kosi River – Hydrological Analysis – By Aronsson, Alexander LU and Piculell, Maria(2011) In TVVR 10/5025 VVR820 20111
. Inputs from renowned technical advisor honorable Er. Neelendu Sanyal ex chairman GFCC and Ex in-charge WRD, Bihar for his valuable and immortal advice.
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