SW6230104_Design Calculations_20230414

Dunn, NC — Underdrain Pipe Size Equation
Per the NCDEQ Erosion and Sediment Control Planning and Design Manual:
Section A-5, Underdrain Systems
Equation 1 : Underdrain pipe size
D=16*((Q*n)/(s ^ 0.5)) ^ (3/8)
For our project:
Q=0.71 1 cfs
n=0.01 1
S=0.5%
D=2.94