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Curb Opening Inlet Orifice Equations Formulas Design Calculator

Solving for flow depth.

flow depth

Note: equation applies to flow depths greater than 1.4 the opening height

Inputs:
capture flow rate (Qi) 
area of opening (A) 
acceleration of gravity (g) 
height of opening (h) 

Conversions:
capture flow rate (Qi) = 0    = 0  foot^3/second
area of opening (A) = 0    = 0  foot^2
acceleration of gravity (g) = 0    = 0  foot/second^2
height of opening (h) = 0    = 0  foot

Solution:
flow depth (d)  =  HAS NOT BEEN CALCULATED 

Other Units:

Change Equation
Select an equation to solve for a different unknown

curb type gutter
gutter flow rate gutter flow rate
Manning's coefficient Manning's coefficient
roadway cross slop roadway cross slope
longitudinal slope longitudinal slope
flow width flow width

curb opening inlet with weir operation
requirement
capture flow rate or interception capacity capture flow rate or interception capacity
curb opening length curb opening length
curb opening width curb opening width
flow depth at curb flow depth at curb

curb opening inlet with weir operation
no depression
requirement
capture flow rate or interception capacity capture flow rate or interception capacity
curb opening length curb opening length
depth of flow depth of flow

curb opening inlet with orifice operation
capture flow rate or interception capacity capture flow rate or interception capacity
curb opening area curb opening area
acceleration of gravity acceleration of gravity
flow depth at curb flow depth at curb
opening height opening height

gutter opening inlet
capture flow rate or interception capacity capture flow rate or interception capacity
grate perimeter grate perimeter
flow depth flow depth

slotted pipe drain inlet
pipe length for complete interception pipe length for complete interception
flow rate flow rate
longitudinal slope longitudinal slope
Manning's coefficient Manning's coefficient
roadway cross slope roadway cross slope

gutter capture efficiency
gutter capture efficiency gutter capture efficiency
capture flow rate capture flow rate
total flow rate total flow rate

gutter carryover or bypass
gutter carry over gutter carry over or bypass
total flow rate total flow rate
capture flow rate capture flow rate

Where
Q  =  gutter flow rate
n  =  Manning's coefficient
Sx  =  roadway cross slope
S  =  longitudinal slope
T  =  flow width
d  =  flow depth at curb
a  =  depressing depth

References - Books:

Martin Wanielista, Robert Kersten and Ron Eaglin. 1997. Hydrology Water Quantity and Quality Control. John Wiley & Sons. 2nd ed.
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