Hunan terrain was on three sides, east, west, south and north of the horseshoe shape of the basin. Sanxiang four-point source pollution of water - irrigation and fertilizer, sewage, animal manure, industrial wastewater, mineral fuels, etc., over many years, with the water flow under. The Three Gorge

Hunan Province is lying south east, west, north, and 3 high-low horseshoe-shaped basin. Hunan Province 3 OF THE 4 water-source pollution - farm fertilizers, sewage, manure, wastewater, and fossil fuels, and so on, all year long, with the sequential homeopathy. And it stands out of the Three Gorges D