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The weir group has been great negative impact on fish migration, and there is no corresponding construction standard for the height of weir which may destroy fish migration. In this study, the discharge in extreme velocity of the local fish and submerged conditions of the weir was taken as a limitation of the height of the weir group in mountain area. Taking Majin River as an example, the height of weir was analyzed aiming for the local fish to get over the weir in migration period with one-dimensional hydrodynamics model. The results showed that the fish cannot pass through all weirs at a specific discharge with current weir height, by reducing the height of the weir, the discharge met to fish migration can be reduced, and different weirs required different heights to be reduced. The fish can pass through all weirs at a limited discharge with the weir heights reduced. This method provides a calculation method for determining the height of weir in mountain river.

Analysis of Affirming the Height of Weir Based on Fish Swimming Performance in Mountain River