Curb Opening Hydraulics Calculator
The curb opening calculation is a program that will calculate the capacity of a curb opening on grade conditions, and will determine the length to capture a percentage of flow. This calculation is not to be used in conjunction with the modified Manning calculations for inlet grates.
Enter 4 of the 5 variables and the remaining variable will be calculated.
The normal variables typically entered are Longitudinal (SL) and Transverse (ST) slopes, Manning roughness coefficient n: and either but not both the curb opening length (LT) or the flow (Q).
If an efficiency number from 0 to 1 is entered it will determine the length of a curb opening that will capture that fraction of flow.
The efficiency of curb-opening inlets shorter than the length required for total interception is expressed by the
A modified version of the first equation that deals with gutter depression and curb opening efficiency.