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Rainfall Intensity Calculator

$I = (b) / (t_c+d)^e$

$(b)"coefficient b"$

$(t_c)"Time of Concentration"$

$(d)"coefficient d"$

$(e)"coefficient e"$

Tags

The Rainfall Intensity Calculator finds the average rainfall rate for a specific duration and a selected frequency, where:

I = average rainfall intensity
t_c = time of concentration
- time required for an entire watershed to contribute to runoff at the point of interest for hydraulic design
e, b, d = coefficients based on rainfall IDF data

The Math

I = b / (t_c + d)^e

where:

I = average rainfall intensity

t_c = time of concentration

e, b, d = coefficients based on rainfall IDF data

References

OnlineManuals (http://onlinemanuals.txdot.gov/txdotmanuals/hyd/rational_method.htm)