The key to a long term, effective and reasonable manner of flood management in the Brahmaputra valley lies in constructing some large storage reservoirs. With the latest expertise on dam construction now available high dams on the major tributaries of the Brahmaputra should be possible. The various benefits of flood moderation, hydro –power generation, irrigation, navigation etc. make multipurpose dams economically viable. While reservoirs on the Siang (Dihang) and the major tributaries like Subansiri, the Dibang, theLohit and the Jia bharali could contribute substantially to reduction of flood peaks, flood frequency and flood stages in the main river, tributaries like the Pagladiya, the Puthimeri, the Buri Dihing, the Disang, the Dikhu, the Jhanzi, the Dhansiri etc. would require to be provided with storage reservoirs to moderate flooding in their valleys.
The construction of a multi/purpose project across any river influences ecological balance in each vicinity as also the regime of the river in the downstream reach. Some of the likely change that could take place are average while yet others are beneficial the reservoir created by a dam may submerge considerable forest and agriculture land, some habitation as also some length of roads in the submerged area as significant portion pertains to the river bad and banks. In formulating storage dam projects the adverse effect of the reservoir on the ecological balance would have to be taken into consideration and adequate measures prohibited for restoring the balance.
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