Free Web Tool · Hydrology

IDF Curve Builder

Build an IDF curve from Talbot i = a/(t+b) or Sherman i = a/t^n with auto coefficients, then look up rainfall intensity i for any (t, T).

Input

Results

i at lookup (t, T)
Total rainfall depth P
Curve at t = 5 min
Curve at t = 30 min
Curve at t = 60 min
Curve at t = 120 min
Method

Talbot: i [mm/hr] = a / (t [min] + b). Sherman: i = a / t^n. For T-year intensity, interpolate (a,b/n) between two reference T values (here 2 yr and 25 yr) using log-linear in T.