Optimizing Irrigation and Drainage Canals Coat (IDCC) (Case study: Rasht City in Iran)

Abstract

Selecting cross sectional variables like canal subsidiary slope, floor width, flow depth, and canal section radius are different based on the
purposes of designers. For different goals, various values and relations among sectional variables are possible. One of these goals is
minimizing total costs of canal section for the passage of ensured Debbi from a definite area. In addition to low cost, optimal cross section
variables should be determined in a way that enables meeting hydraulic constraints. In concrete trapezoid canals, there are problems like
passing Debbi, canal subsidiary slope, and canal coat diameter. They need accurate calculations to optimize the design for passing proper
Debbi based on land slope. This study uses an optimal technique of concrete coat diameter in trapezoid canals to maximize favorable Debbi
with the most economical costs by a cost function and technical and executive constraints of irrigation and drainage coat dimensions.