Document Type : Research Paper
Authors
1 Scientific Board, Soil Conservation and Watershed Management Research Institute, Iran
2 Associate Professor, Soil Conservation and Watershed Management Research Institute, Iran
Abstract
This project is about evaluation of groins in Zanjanrood River, which located in Zanjan province with aim the investigation affected groins in control and recovery land use in the buffer river. Therefore, first we study of groin design standards, thus, we compare the executive groins with these standards. The official and field studies show that the executive groins were designed in low risk and most of parameters like length, space and height of groins are over design. This means the costs are high and non economical. The problem was in operation, so that some components in build maps and plans are deferent from executed groins, especially in groin section and groin foundation. The problem is that hard groins in alluvial riverbed are more non-stable and score in head of them are more. Any way in regime condition space between groins and river width adjustment were suitable. In continue the report is about economical analysis. In this state, pure value for each groin and period time of investment and rate of social decreasing was calculated. Then by calculating for relative between benefit to cost the efficiency rate was taken.
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