FLOW CONDITIONS IN DRAIN
FLOW CONDITION AT SECTION 1-1
COEFFICIENT OF RUGOSITY (n) 0.0250
DISCHARGE (Q) 30.706
( in Cumecs)
BED LEVEL (BL) 404.860
SIDE SLOPE (s) 1.500
BED WIDTH (B) 16.000
( in mtrs)
FLOW DEPTH (D) 1.820( in mtrs) MFL + 406.680
1.5 :1
MFL 406.680 1.820 m
AREA = (B+sD)D 34.089
( in Sqm) BL + 404.860
16.000
VELOCITY (V ) = Q / A 0.901( in m/s)
VEL. HEAD = V2 / 2g 0.041(in mtrs)
TEL @ 1-1 = MFL + VEL. HEAD 406.721
PERIMETRE (P) = B + 2D (1 + s2 )1/2 22.562 (in mtrs)
HYDRAULIC MEAN RADIUS (R) = A / P
( in mtrs) 1.511
SURFACE SLOPE (S) = V2 n2 / R4/3 0.00029 3418.642302
FLOW CONDITION AT SECTION 2-2
LENGTH FROM PREVIOUS SECTION(L)
( in mtrs) 0.000
COEFFICIENT OF RUGOSITY (n) 0.018
DISCHARGE (Q)
( in Cumecs) 30.706
BED WIDTH (B) 16.000
( in mtrs)
SIDE SLOPE (s) 0.000
BED LEVEL 404.860
FLOW DEPTH (D) 1.812( in mtrs) MFL + 406.672
MFL 406.672 1.812 m
AREA = (B+sD)D 28.992
( in Sqm) BL + 404.860
16.000
VELOCITY (V ) = Q / A 1.059( in m/s)
VEL. HEAD = V2 / 2g 0.057(in mtrs)
PERIMETRE (P) = B + 2D (1 + s2 )1/2
(in mtrs) 19.624
HYDRAULIC MEAN RADIUS (R) = A / P
( in mtrs) 1.477
SURFACE SLOPE (S) = V2 n2 / R4/3 0.000216
EDDY LOSS(he) = 0.5( V12 - V22 ) / 2g
( in mtrs) 0.008
FRICTION LOSS (H ) 0.000( in mtrs)
TEL wrt MFL = MFL + VEL HEAD 406.729 0.000
TEL wrt PREVIOUS TEL = PRE.TEL + EDDY LOSS
+FRI.LOSS 406.729 0.000 <------ Difference in TELs
FLOW CONDITION AT SECTION 3-3
LENGTH FROM PREVIOUS SECTION(L)
( in mtrs) 14.550
COEFFICIENT OF RUGOSITY (n) 0.0180
DISCHARGE (Q) 30.706
( in Cumecs)
BED WIDTH (B)
( in mtrs) 6.300
SIDE SLOPE (s) 0.000
BED LEVEL 404.860
FLOW DEPTH (D) 1.791( in mtrs) MFL + 406.651
MFL 406.651 1.791 m
AREA = (B+sD)D 22.567
( in Sqm) BL + 404.860
6.300
VELOCITY (V ) = Q / A 1.361( in m/s)
VEL. HEAD = V2 / 2g 0.094(in mtrs)
PERIMETRE (P) = B + 2D ( 1 + s2 ) 1/2
( in mtrs) 19.764
HYDRAULIC MEAN RADIUS (R) = A / P
( in mtrs) 1.142
SURFACE SLOPE (S) = V2 n2 / R4/3 0.000503
EDDY LOSS(he) = 0.3 ( V12 - V22 ) / 2g
( in mtrs) 0.011
FRICTION LOSS(Hf)
( in mtrs) 0.004
TEL wrt MFL = MFL + VEL HEAD 406.745
TEL wrt PREVIOUS TEL = PRE.TEL + EDDY LOSS
+FRI.LOSS 406.745 0.000 <------ Difference in TELs
LOSS OF HEAD CALCULATIONS INSIDE THE BARREL(using UNWIN's formula)
LENGTH FROM PREVIOUS SECTION(L)
( in mtrs) 19.800
COEFFICIENT OF RUGOSITY (n) 0.018
DISCHARGE (Q) 30.706
( in Cumecs)
BED WIDTH (B) 6.000
( in mtrs)
SIDE SLOPE (s) 0.000
BED LEVEL 404.860
0.3
FLOW DEPTH (D) (ie VENT HEIGHT)
( in mtrs) 3.000
AREA (A) = (Overall "A" of all vents)
( in Sqm) 18.000 3.000 m
PERIMETRE (P) = (Overall "P" of all vents)
( in mtrs) 24.000 BL + 404.860
6.000
VELOCITY (V ) = Q / A 1.706( in m/s)
VEL. HEAD = V2 / 2g 0.148(in mtrs) VENT WAY SECTION
HYDRAULIC MEAN RADIUS (R) = A / P
( in mtrs) 0.750 vent size= 3.0 x 3.000
SURFACE SLOPE (S) = V2 n2 / R4/3 0.001384 150 x 150 HAUNCHES ARE CONSIDERED
f1 (Coef. Of Loss of Head at Entry) 0.505 IN CALCULATING 'A' & 'P'
a (assuming that the walls inside the barrel are
plastered) 0.003160
b 0.03050
f2 (at Entry) = a(1+b/R) 0.00329
Loss of Head inside barrel(h) = (1+f1+f2
L/R)V2/2g 0.236
TEL @ 4-4 = PRE. TEL + h 406.981
FLOW CONDITION AT SECTION 4-4
COEFFICIENT OF RUGOSITY (n) 0.018
DISCHARGE (Q) 30.706
( in Cumecs)
BED WIDTH (B) 6.300
( in mtrs)
SIDE SLOPE (s) 0.000
BED LEVEL 404.860
FLOW DEPTH (D) 1.704( in mtrs) MFL + 406.564
MFL 406.564 1.704 m
AREA = (B+sD)D 10.735
( in Sqm) BL + 404.860
6.300
VELOCITY (V ) = Q / A 2.860( in m/s)
VEL. HEAD = V2 / 2g 0.417(in mtrs)
PERIMETRE (P) = B + 2D ( 1 + s2 )1/2
( in mtrs) 9.708
HYDRAULIC MEAN RADIUS (R) = A / P
( in mtrs) 1.106
SURFACE SLOPE (S) = V2 n2 / R4/3 0.002318
TEL wrt MFL = MFL + VEL HEAD 406.981
TEL OBTAINED FROM PREVIOUS CAL.s WITH
UNWIN's 406.981 0.000 <------ Difference in TELs
formula
FLOW CONDITION AT SECTION 5-5
LENGTH FROM PREVIOUS SECTION(L) 9.700( in mtrs)
COEFFICIENT OF RUGOSITY (n) 0.018
DISCHARGE (Q) 30.706
( in Cumecs)
BED WIDTH (B) 16.000
( in mtrs)
SIDE SLOPE (s) 0.000
BED LEVEL 404.860
FLOW DEPTH (D) 2.168( in mtrs) MFL + 407.028
MFL 407.028 2.168 m
AREA = (B+sD)D 34.688
( in Sqm) BL + 404.860
16.000
VELOCITY (V ) = Q / A 0.885( in m/s)
VEL. HEAD = V2 / 2g 0.040
PERIMETRE (P) = B + 2D ( 1 + s2 )1/2
( in mtrs) 20.336
HYDRAULIC MEAN RADIUS (R) = A / P
( in mtrs) 1.706
SURFACE SLOPE (S) = V2 n2 / R4/3 0.000125
EDDY LOSS(he) = 0.2 ( V12 - V22 ) / 2g
( in mtrs) 0.075
FRICTION LOSS(Hf) 0.011847
TEL wrt MFL = MFL + VEL HEAD 407.068
TEL wrt PREVIOUS TEL = PRE.TEL + EDDY LOSS
+FRI.LOSS 407.068 0.000 <------ Difference in TELs
