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This shows how to evaluate the scour depth at a stilling basin .
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PROJECT DATE 15/11/2013
STRUCTURE DESIGNED sam
REF OUTPUT
Design of scour depth of a retaining wall parallel to the river
REFERENCES
HEC 23 , Chapter ‐ 4
Governing equation and Notations
Ys = Y1( 0.73 + 0.14PI()Fr^2
Ys= Equilibrium depth of scour ( measured from mean bed level )
Y1 = Average upstream flow depth in the river
Fr ‐ Upstream Froude Number
ENTER FIGUR
NOTATION UNIT
Q m3/s 165.00
L m 35.00
m 559.50
m 561.10
Y1 m 1.60
V m/s 2.95
Fr 0.74
Ys m 1.56
m 1.75
Froude number
Average Width of river
Average velocity
Minimum Depth of retaining wall foundation
Ys
Upstream water depth
Average bed level
Average water level for Q 100
GURA SHP
Retaining wall scour depth
CALCULATIONS
INPUT DATA
100 yr. Flood flow