Abstract
It is usual practice, in good conditioned earthen Egyptian canal design, to assume that Manning's roughness coefficient is equal to 0.025. Field monitoring showed that more than 40% of the canals are infested by Submerged Weeds (Potamogeton pectinatus, Potamogeton nodosus andPotamogeton crispus), in which case Manning's n-vlaues are higher than in the design. A numerical procedure for the design of canals with submerged weeds in Egypt is presented. The procedure is based on the Manning formula and the n-vR relationships, vegetation density and different types of distribution of submerged weeds along the canal cross-section. The presented numerical solution is an iteration process within the capabilities of a scientific pocket calculator.
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