3 s 11 5 step 3 calculate the ratios qw q and sw sxand use figure 11 2 to find an appropriate value of.
Gutter flow formula.
Curb gutter flow rate.
T flow width.
Step 2 calculate the gutter flow in w qw using the equation.
A depressing depth.
S longitudinal slope.
Martin wanielista robert kersten and ron eaglin.
Or m g acceleration due to gravity 32 2 ft s 2 or 9 81 m s 2 y depth of water in the curb and gutter cross section ft.
Q total flow reaching inlet cfs or m 3 s c o orifice coefficient 0 67 h depth of opening ft.
Code to add this calci to your website.
Or m a gutter depression depth ft.
Qw q qs qw 0 057 0 020 0 037 m.
Here we can calculate for curb gutter flow rate.
N manning s coefficient.
S x roadway cross slope.
Curb gutter flow rate.
Where q gutter flow rate n mannings coefficient s x roadway cross slope s longitudinal slope t flow width.
John wiley sons.
Or m this depth will vary slightly with the inlet detail used l length of curb opening inlet ft.
Rearranging equation 10 17 allows a direct solution for required length.
D flow depth at curb.