The Rohmoria area is located 20 km north east of Dibrugarh town on the south bank of river Brahmaputra in the Dibrugarh district in Upper Assam. The Rohmoria area falls in the Kobo to Dehingmukh reach of the Brahmaputra river, just a few kilometers downstream of Kobo which is the starting point of river Brahmaputra. The gradient of the river is 1 in 3,700 in this reach. The area where the Brahmaputra river has caused extensive erosion, is surrounded by a number.
There is serious erosion in each year in Dibrugarh district, where particularly Rohmoria is the worst affected. It is found that the rate of erosion in the 16 km long section around Rohmoria in the south bank was 0.06 sq km per km during the period from 1915 to 1972, which is almost double of the overall rate (0.03) of river Brahmaputra. Again, the rate of erosion turned out to be.0.26 sq km per km for the period from 1972 to 1996, which is four times higher than the previous rate (0.06). This convincingly proves that the rate of erosion in Rohmoria area is increasing constantly and the situation is becoming very grave. The increasing rate of erosion in this place is due to direct action of the river flow as it takes a large concave turn and hits the bank directly. It to be added here that, during the flood of 2008, the Rohmoria area experienced tremendous flood pressure and erosion activity intensified. Specially at the D/S reaches of the existing pipe dampeners at Rohmoria, the erosion become devastating and eaten away huge shank of valuable homestead and tea garden areas. In the month of September 2008, the bank erosion again became aggravated due to activation of obliquely flowing sub-channels.
The provisions made in the DPR are:
Estimated Cost: Rs 5982 Crores.
Benefit Cost Ratio: 2.65:1
|ROHMORIA AREA IN 2010 (Before implementation of |
|Eroded villages up to Feb/ 2009 at Rohmoria||First phase work-plan of pro-siltation measures |
taken up at Rohmoria after floods of 2010
The project is implemented as follows:
|Post-flood view of another porcupine screen taken |
up at Rohmoria channel before 2010 floods
|Post-flood view of another RC porcupines in screen |
and along bank of Rohmoria channel
|Second phase bank-protection works of sand-filled |
geo-bags taken up at Rohmoria after floods of 2011,
(excavation for apron-bed)
|Flood-period view of Rahmoria bank in April/2012||Eco-friendly bank at Rohmoria in 2014||Stable bank of Rohmoria in July/2014|