27l_sill-level_palavagu_srlip-7.pdf

SITA RAMA LIFT IRRIGATION PROJECT DISTRIBUTARY PACKAGE No.-7 PALAVAGU CANAL CALCULATION OF OT SILL LEVEL Design of off take for 27 L @ Km. I Design: Gross command area = Duty adopted = 100 A/c Discharge required = 458.000 Add 20% Losses

6.550 On Palavagu Canal Of SRLIP. 458.000

Ac

100 =

Discharge of O.T channel = Design of canal Section for various discharge conditions Main canal Description Full 3/4 Suply Discharge Bed width Depth Side slopes Bed fall Rugosity coefficient 'n' Wetted area A=(B+nD)D Wetted perimeter P=(B+2*1.803*D) R= A/P R2/3 V =1/n*R2/3*S1/2 Designed Discharge A*V V0 = 0.39*D0.55

16.73 8.00 2.20 1.50 8000 0.023 24.86 15.93 1.56 1.35 0.668 16.619 0.60

12.55 8.00 1.900 1.50 8000 0.023 20.62 14.85 1.39 1.24 0.62 12.75 0.56

4.580 cusecs 0.916 5.496 cusecs 0.156 Cumecs Units

O.T channel Full

cumecs m m

0.156 0.80 0.45 1.50 5000 0.023 0.664 2.423 0.274 0.422 0.265 0.176 0.251

sqm m m m/sec. cumecs m/sec.

Critical velocity V/V0 = 1.11 1.11 B/D Ratio 3.64 4.21 Free board 0.75 0.75 CBL 265.353 265.353 FSL 267.553 267.253 TBL 268.303 G.L 271.648 271.648 II Sill Level of O.T 3/4 Supply Condition Minimum Driving Head = 0.150 m The sill levels are fixed considering 3/4 FSL condition in the parent canal

3/4 supply Level in Main Canal Rear full supply Level Of OT

Canal bed Level Of OT

= = = =

Sill level

= =

1.05 1.778 0.30 266.653 267.103 267.403

m m m m m

= 265.353 = 267.253 m 3/4 FSL parant canal 267.253 267.103 m Rear FSL Of OT 267.103 0.45 266.653 m 266.653 m

+

1.900

Minimum Driving Head 0.150 FSD Of OT