Curb Opening Inlet Orifice Equations Formulas Design Calculator


Solving for acceleration of gravity.
acceleration of gravity
Note: equation applies to flow depths greater than 1.4 the opening height

Inputs:

capture flow rate (Qi)
area of opening (A)
flow depth (d)
height of opening (h)


Conversions:

capture flow rate (Qi)
= 0
= 0
foot^3/second
area of opening (A)
= 0
= 0
foot^2
flow depth (d)
= 0
= 0
foot
height of opening (h)
= 0
= 0
foot

Solution:

acceleration of gravity (g)
= NOT CALCULATED

Other Units:


Change Equation
Select to solve for a different unknown
curb type gutter
gutter flow rategutter flow rate
Manning's coefficientManning's coefficient
roadway cross sloproadway cross slope
longitudinal slopelongitudinal slope
flow widthflow width
curb opening inlet with weir operation
requirement
capture flow rate or interception capacitycapture flow rate or interception capacity
curb opening lengthcurb opening length
curb opening widthcurb opening width
flow depth at curbflow depth at curb
curb opening inlet with weir operation
no depression
requirement
capture flow rate or interception capacitycapture flow rate or interception capacity
curb opening lengthcurb opening length
depth of flowdepth of flow
curb opening inlet with orifice operation
capture flow rate or interception capacitycapture flow rate or interception capacity
curb opening areacurb opening area
acceleration of gravityacceleration of gravity
flow depth at curbflow depth at curb
opening heightopening height
gutter opening inlet
capture flow rate or interception capacitycapture flow rate or interception capacity
grate perimetergrate perimeter
flow depthflow depth
slotted pipe drain inlet
pipe length for complete interceptionpipe length for complete interception
flow rateflow rate
longitudinal slopelongitudinal slope
Manning's coefficientManning's coefficient
roadway cross sloperoadway cross slope
gutter capture efficiency
gutter capture efficiencygutter capture efficiency
capture flow ratecapture flow rate
total flow ratetotal flow rate
gutter carryover or bypass
gutter carry overgutter carry over or bypass
total flow ratetotal flow rate
capture flow ratecapture 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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