Prognostic of Maximum Flow Rate by Sasiss Model: Sensibility to Rugosity and Slope

Abstract

This research aimed to analyse the sensibility of maximum non-erosive flow rate, proposed by Walker & Skogerboe (1987), in response to the variation of field parameters: slope (varying from 0.007 to 0.019 m m-1) and soil superficial rugosity (varying from 0.01 to 0.0477 m-1/3 s) under the conditions of open furrow irrigation with continuous flux in silte clay loam soil. The sensibility analysis was carried out by simulation through the SASIS software (software specifically developed for superficial irrigation simulation), developed by Pordeus & Azevedo (2005). Input data was collected from four experimental areas under distinct field conditions. As a result, impracticable maximum non-erosive flow rates could be identified in response to certain combinations of soil superficial rugosity and slope. It was observed that the increase of both rugosity and slope caused the maximum non-erosive flow rate variation to decrease.