The Weihe River's flow into the Yellow River at Tongguan has been affected by changes in elevation, leading to sedimentation and erosion issues. A rise in Tongguan's elevation caused sedimentation, while a decrease could lead to erosion in certain areas. Lowering Tongguan's elevation would increase channel capacity and decrease flood risk. The river's channel would become deeper and narrower, affecting its meandering pattern. Stabilization projects are needed to maintain the river's stability.