LEGEND OF CIVIL

 As per IS 6966-(Part-1) the discharge of  barrage or weir is calculated using below formula: Calculation of discharge capacity of the barrage

CAUSES OF FAILURE OF BARRAGE AND THEIR REMEDIES | DAM | BARRAGE | WEIR The weir and barrage failure may take place due to the following reasons Piping or undermining. Rupture of the floor due to uplift . Rupture of the floor due to suction caused by standing wave . Scour at U/S and D/S side of weir floor . 1. Piping or undermining When water seeps under the base of the weirs founded on the permeable soils, emerges out at the D/S end of the impervious floor of the weir, hydraulic gradient or exit gradient may exceed a certain critical value for the foundation soil, the soil starts boiling at the exit point. Boiling of the soil indicates lifting of the soil against gravity and it happens only when exist gradient of seeping water is greater than the safe limit for the foundation soil. The soil gets wash out with percolating water. This process of erosion of soil from below the foundation, progressively, works backward towards the U/S. This process ultimately develops a channel or pi...