scour depth
TRANSCRIPT
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8/13/2019 Scour Depth
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Description Symbol/Formula UnitHydraulic Data
Discharge Q des cfs 133,666 3785.00cumecs
Lacey's Silt Factor f - 10.00 dm 32.28 mm
Top Width TW ft 475.60 145.00m
f 1.76*(dm)^0.5
Dicsharge Intensity w.r.t TW q cusec/ft 337.26 f 10.00
Lacey's normal scour depth R =0.9(q2 /f)
1/3ft 20.24
Safety Factor x 1.50
Scour Depth from HFL xR ft 30.36
m 9.25
Highest Flood Level HFL m 670.32 661.07 661.25
Scour Elevation S.E m 661.07
Bed Level B.L m 305.15
Depth of Water d m 365.17
Scour Depth Below Bed Level m -355.92
Calculation for Scour Depth by Lacey's Method
Value of f
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8/13/2019 Scour Depth
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Description Symbol/Formula UnitHydraulic Data
Discharge Q des cfs 18,561 525.59cumecs
Lacey's Silt Factor f - 1.00 dm 0.32 mm
Top Width TW ft 346.70 105.70m
f 1.76*(dm)^0.5
Dicsharge Intensity w.r.t TW q cusec/ft 64.24 f 1.00
Lacey's normal scour depth R =0.9(q2 /f)
1/3ft 14.46
Safety Factor x 1.25
Scour Depth from HFL xR ft 18.07
m 5.51
Highest Flood Level HFL m 304.12 298.61 298.79
Scour Elevation S.E m 298.61
Bed Level B.L m 300.57
Depth of Water d m 3.55
Scour Depth Below Bed Level m 1.96
Calculation for Scour Depth by Lacey's Method
Value of f
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8/13/2019 Scour Depth
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DescriptionSymbol/Formula Unit Hydraulic Data
Discharge Q des cfs 39,500 1118.51cumecs
Lacey's Silt Factor f - 1.00 dm 0.32 mm
Top Width TW ft 482.16 147.00m
f 1.76*(dm)^0.5
Dicsharge Intensity w.r.t TW q cusec/ft 98.31 f 1.00
Lacey's normal scour depth R =0.9(q2 /f)
1/3ft 19.20
Safety Factor x 1.25
Scour Depth from HFL xR ft 24.00
m 7.31
Highest Flood Level HFL m 307.57 300.26 300.44
Scour Elevation S.E m 300.26
Bed Level B.L m 302.92
Depth of Water d m 4.65
Scour Depth Below Bed Level m 2.66
Calculation for Scour Depth by Lacey's Method
Value of f
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8/13/2019 Scour Depth
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DescriptionSymbol/Formula Unit Hydraulic Data
Discharge Q des cfs 50,000 1415.84cumecs
Lacey's Silt Factor f - 1.00 dm 0.32 mm
Top Width TW ft 767.52 234.00m
f 1.76*(dm)^0.5
Dicsharge Intensity w.r.t TW q cusec/ft 78.17 f 1.00
Lacey's normal scour depth R =0.9(q2 /f)
1/3ft 16.48
Safety Factor x 1.50
Scour Depth from HFL xR ft 24.72
m 7.53
Highest Flood Level HFL m 311.70 304.17 304.35
Scour Elevation S.E m 304.17
Bed Level B.L m 305.15
Depth of Water d m 6.55
Scour Depth Below Bed Level m 0.98
Calculation for Scour Depth by Lacey's Method
Value of f
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8/13/2019 Scour Depth
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R.D Discharge Bed Level HFL Scour DepthBelow Bed EL
Max ScourEL.
m cusecs m m m m
HAJIZAI 22+450 50000 305.15 311.70 1.00 304.15
NAGOMAN 27+700 39500 302.92 307.57 2.66 300.26
SHAH ALAM 31+450 18561 300.57 304.12 2.00 298.57
GREATER WATER SUPPLY SCHEME PESHAWER
WATER TRANSMISSION MAIN FROM MUNDA TREATMENT PLANT TO RING ROAD
Bridge Name
Computation of Maximum Scour Depth