This Excel file contains some of the more important design flood estimation methods used in South Africa in excel format. The formulas have already been entered but please be sure to check each formula as the conditions might change. These design flood estimation methods are based on the Drainage M...
2.1073023411289 hours 1.315620879 hours
Rainfall
I
Return period (years), T 2 5 10
Point rainfall (mm) PT 20 40 60
Point intensity (mm/hour), PiT(= PT/TC) 15.2 30.4 45.6
Area reduction factor (%), ARF T 100 100 100
Average intensity (mm/hour), IT (=
PiT x ARFT) 15.2 30.4 45.6
Return period (years), T 2.0 5.0 10.0
Peak flow (m^3/s), 9.0 18.1 27.4
𝑸_𝑻 =(𝑪_𝑻 𝑰_𝑻 𝑨)/(𝟑.𝟔)
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