Long Crested Weirs

by Robert E. Walker, California Polytechnic State Univ, San Luis Obispo, CA, USA,

Document Type: Proceeding Paper

Part of: Planning, Operation, Rehabilitation and Automation of Irrigation Water Delivery Systems


A method has been developed to integrate and evaluate the head relationship between canal weirs and turnouts. The objective is to minimize flow variations through the turnout and at the same time permit the canal flow to vary to meet the changing needs of the system. A step-by-step procedure is presented for the computations of the required length of a long crested weir. Using the long crested weir results in a more stable flow rate through the turnout with less labor. The benefit to the water user is that less labor is required to manage or control the water.

Subject Headings: Flow duration | Labor | Professional societies | Permits | Computing in civil engineering | Irrigation | Canals | Weirs

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