IDF curves
Posted: Mon Jan 26, 2015 2:50 pmHello
Working on a project in North Port, FL. The FDOT has a third degree polynomial equation for my area. Any ideas how to enter this IDF information?
Polynomial Coefficients for a Third Degree Polynomial
Zone Storm Frequency in Years A B C D
11 2 10.09256 -2.25031 0.01661 0.01544
11 3 9.30810 -1.21537 -0.25504 0.03590
11 5 9.02699 -0.47796 -0.46784 0.05263
11 10 10.23814 -1.23242 -0.27724 0.03685
11 25 11.68811 -1.61200 -0.25239 0.03706
11 50 9.94772 0.31312 -0.73271 0.07222
_____________
I = A + BX + CX^2 + DX^3
X = loge (time in minutes)
These equations were derived from the rainfall curves and are not exact representations
thereof. Appropriate values for X are 8 to 180 minutes.
Working on a project in North Port, FL. The FDOT has a third degree polynomial equation for my area. Any ideas how to enter this IDF information?
Polynomial Coefficients for a Third Degree Polynomial
Zone Storm Frequency in Years A B C D
11 2 10.09256 -2.25031 0.01661 0.01544
11 3 9.30810 -1.21537 -0.25504 0.03590
11 5 9.02699 -0.47796 -0.46784 0.05263
11 10 10.23814 -1.23242 -0.27724 0.03685
11 25 11.68811 -1.61200 -0.25239 0.03706
11 50 9.94772 0.31312 -0.73271 0.07222
_____________
I = A + BX + CX^2 + DX^3
X = loge (time in minutes)
These equations were derived from the rainfall curves and are not exact representations
thereof. Appropriate values for X are 8 to 180 minutes.