Following this stage, the flood hazard and intensity layer
was overlapped with the overuse layer using 2D matrix.
Consequently, the final layer was obtained and the final flood
risk map for 6 sub-watersheds was determined (Table 9). The
results indicated that Chelichay and Sarab Gorganroud sub-
watersheds are the most risky sub-watersheds in terms of
floods, as in Chelichay sub-watershed both flood hazard and
intensity and overuse necessitate assigning the first priority
on flood control. Comparatively, Sarab Gorganroud sub-
watershed is in the second class based on flood hazard and intensity and in the first class based on overused lands. Sub-
watersheds of Middle Gorganroud and Doogh are in the sec-
ond class and Gharesou and Payab is in the third class for
flood control, and the highest vulnerability to these sub-
watersheds is due to flood hazard and intensity The results also indicate that Chelichay and Sarab sub-
watersheds are exposed to high levels of flood risk cover-
ing about 7.48% and 17.11% of the Gorganroud watershed
area, respectively, and should be considered as top priorities
in flood harnessing. Approximately 18.64% and 17.03% of
the total watershed in Dough and Middle Gorganroud sub-
watersheds have moderate flood risk. Finally, 26.35% and
13.36% of the watershed in Payab and Gharesou sub-water-
sheds have low flood risk (Fig. 7).