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Prioritizing watershed management practices based on hydrological factors In (Chehelchay Watershed)
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Saeedeh Sadat Hoseinie   , Ali Heshmatpour * , Hamed Ruohani , Hassan Farazjoo |
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Abstract: (22 Views) |
| Periodic floods are causing increasing destructive impacts and resulting in human and financial losses in many parts of the country. In this context, identifying flood-prone areas within watersheds and prioritizing sub-watersheds for implementing watershed management projects as a preventive measure against floods is considered one of the effective strategies in natural resource management. In this study, the contribution of sub-watersheds to the total flood runoff, based on a 50-year return period, was determined by integrating Geographic Information System (GIS) and HEC-HMS hydrological modeling. Then, the three sub-watersheds of the study area were divided into 18 management units. Using the SCS model and the individual sub-watersheds removal method, along with the flood-specific index, the sub-watersheds and management units of the watershed were prioritized for the implementation of watershed management operations. The findings indicated that management units 10, 14, and 16, with a peak discharge of 647.9 m3 s-1 in sub-watersheds CH3; management unit 7, with a peak discharge of 80.9 m3 s-1 in sub-watersheds CH2; and management units 3 and 5, with a peak discharge of 64.7 m3 s-1 in sub-watersheds CH1, are identified as having more critical conditions and higher priority for the implementation of control and protective measures. The results obtained from this study will enhance the accuracy and speed of selecting suitable locations, while also reducing costs for the managers of the implementation sectors. Additionally, strengthening vegetation cover and applying traditional methods, such as the construction of small dams in more critical areas, are recommended. |
Article number: 3 |
| Keywords: Individual remove of sub-watershed, Runoff storage, Special index f, SCS., HEC-HMS |
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Type of Study: Research |
Subject:
Special
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