Abstract
The Gradually Varied Flow profile in a circular channel section is computed using the Direct Step Method and the Integration Method. The effect of variable pipe roughness on the length of the profile is investigated. The variation in the profile length ranged from 0·53 to 4·73 depending on the type of the Gradually Varied Flow profile. A computer model is developed to calculate the length of the Gradually Varied Flow profile using the Step and Integration Methods. Variable pipe roughness is used with downward (positive), horizontal and/or adverse bed slopes. The computer model can provide total Gradually Varied Flow length or a detailed x− y calculation. Lotus 1-2-3 printgraph, Energraphic and Free Lance graphics capabilities are used to plot the Gradually Varied Flow profiles.
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