Where is the silt dam?

Silt dams are distributed in the reservoir basin. The structure of warping dam mainly includes: dam body (mostly homogeneous earth dam), spillway and drainage structure (culvert and horizontal pipe), commonly known as "three big pieces".

Siltation dam is an effective soil and water conservation project in the Loess Plateau, which plays an important role in retaining mud and soil, reclaiming farmland, reducing sediment entering the Yellow River, preventing and reducing disasters, returning farmland to forests (grasses) and ensuring ecological security.

The functions and benefits of warping dams mainly include:

(1) Retain mud and protect soil, so as to reduce the inflow of sediment into the Yellow River. The Loess Plateau is the main source area of sediment in the Yellow River. Siltation dams built in ditches at all levels have blocked the channels for transporting sediment downstream from the source, which can not only reduce the erosion of ditches, but also stop the sediment flowing into ditches on the slopes, which has played an extremely important role in the An Lan of the Yellow River.

(2) Reclaim farmland and increase grain output. The warping dam will retain the slope sediment containing a lot of organic matter such as livestock manure and litter in situ, so that the barren ditch will become a fertile dam land. Therefore, it is widely circulated in the Loess Plateau that "it is better to plant ten acres of slopes than one acre of ditches".

(3) Flood control and disaster reduction to ensure downstream safety. Siltation dams are usually built in small watersheds in a cascade way, and water is stored layer by layer. They have strong ability of peak clipping and flood detention, and can effectively prevent the harm caused by flood and sediment to the downstream.