Flood discharge is one of important factors in designs and hydrological works. Because of non-facilities and non-hydrometric equipment in basins without statistics or with deficient statistics especially in small watersheds, estimation of maximum instantaneous flood discharge is one of main problems in watershed projects. In this stud with the aim of determination of acceptable method to estimate maximum instantaneous flood discharge in small watersheds, two methods one base to basin area and other based to physiographical feature and precipitation were studied. The results showed that among methods related to basin area, Horton method with residual sum of squares 2.8(RMSE=2.8) and among methods related to basin- physiographical feature and precipitation, curve number with RMSE=20.6 had least error .so, determined as the best methods. FHWA method because of having most amount of RMSE=5924.5 had the least efficiency for determination of peak discharge in this area.
کلید واژگان :Maximum discharge, Flood estimation, Small watershed, Curve number, RMSE.
ارزش ریالی : 500000 ریال
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