Abstract
In this study, the sediment yield of forest roads of Darabkola watershed was investigated and
estimated using WARSEM and SEDMODEL. Rainfall simulator was applied to measure the
sediment of abovementioned roads directly. In order to apply WARSEM and SEDMODEL models,
field operations for measurement of different parameters including road length and width, height
and coverage of road cut-slope, road longitudinal slope, shape and configuration of the road, road
surface, and etc. were carried out in 63 different segments of the path of forest roads in the study
area as 11979 meters long. Then sediment yield of roads was measured by rainfall simulator with
nozzle of 3 meters high and plot of 2 square meters. Results of the WARSEM and SEDMODL
models and rainfall simulation showed that sediment yield of forest roads are equal to 9.918, 5.109,
and 4.141 kg/m2/year, respectively. Results also showed that there was no significant difference
between sediment yield of rainfall simulation and SEDMODEL at significance level of %95. It was
also revealed that SEDMODL is more suitable for estimating sediment yield of forest road with
values of RD, MD, BIAS, RE and RMSE equal to 21.42, 4.54, 0.04, 17.59 and 0.71, respectively.
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