Pipe data:

Find Pipe Data – Inside Diameter & Hazen Williams Constant.
Find information for various pipe types & sizes:
1) Select pipe material from the drop-down menu
2) the other two menus will then give a choice of pipe ratings.
3) Enter the data into the calculator

“Hazen-Williams Constant” (HWC) is a number which relates to the surface roughness of the pipe internal bore.