Irrigation in the Pacific Northwest

Flow Rate over Trapezoidal (Cipolletti) Weir

Use this calculator to find the flow rate of water when using a trapezoidal weir.

Learn more about the units used on this page.

Height of the backwater above the crest of the weir:
Width of the bottom of the weir:
Flow Rate:


WSU Prosser - IAREC, 24106 N Bunn Rd, Prosser WA 99350-8694, 509-786-2226,