From mid-June to early July. The water and sediment discharge from the Xiaolangdi Reservoir usually takes place from mid-June to early July. At that time, the Xiaolangdi Water Conservancy Project will officially open the water and start the flood dispatch mode. With huge waves and huge waterfalls, it will appear that "the water of the Yellow River comes from the sky and rushes to the sea." The majestic landscape of "No Return". The sand control and water release in Xiaolangdi requires a large amount of water, that is, the flood season to wash away the sand accumulated in the reservoir. Only then can such a large project be completed, which is inseparable from the design function of Xiaolangdi.