CHECK DAM HYDRAULIC PARTICULARS

TOP BUND LEVEL (T.B.L) = + 161.440 M

MAXIMUM WATER LEVEL (M.W.L) = +159.840 M

FULL RESERVOIR LEVEL (F.R.L) = +156.840 M

CREST LEVEL = +156.840 M

TAIL WATER LEVEL (T.W.L) = +158.200 M

MAXIMUM FLOOD DISCHARGE (Q) = 26342.03 cusecs OR 746 cumecs

LENGTH OF THE CHECK DAM (L) = 66 m

Discharge,Q = 746.000 CumecsU/S water level = 159.840 mD/S T.W.L = 158.190 mLength of weir,L = 66.000 mAssumed D1 = 1.122 mU/S Va2 / 2g = 0.000 m (Vel. head at Approach)D/S Vt2 / 2g = 0.000 m (Vel. head at D/S, tail channel)

Discharge/m, q = Q / L = 11.303 Cumec/m V1 = q / D1 = 10.074 m/s Fr = V1 / (g.D1)1/2 = 3.036 D2 = D1/2((1+8F2)0.5 - 1) = 4.290 mD/S T.E.L ---> = D/S TWL + D/S Vt2/2g = 158.190U/S T.E.L ---> = U/S WL + U/S Va2/2g = 159.840Head loss HL = U/S TEL - D/S TEL = 1.650 mCritical Depth Dc = (q2 / g)1/3 = 2.353 m

Head loss, HL = (D2-D1)3 / 4.D1.D2 = 1.651 m(calculated using D1 & D2)

Basin floor level = D/S TWL - D2 = 153.900 mCistern length = 5 ( D1~D2 ) = 15.838 m

Stilling Basin Level = 153.500 mStilling Basin Length = 16.000 m

CALCULATION OF CISTERN LEVEL & LENGTH (100%Q)

HPsED