T/HAEPCI 49-2023 Technical Guidelines for Water Environment Management in Small Watersheds in Southern China

Scope

Scope: This standard specifies the technical measures related to the water environment governance of small watersheds in southern China, including external pollution control, internal pollution treatment, and water quality improvement. This standard is applicable to water environment surveys, engineering design, and technical measure selection related to the water environment governance of small watersheds in southern China. Main technical content: Based on the inheritance and reference of national, local, and group standards related to watershed water environment governance, and considering the characteristics of small watersheds in southern China, a technical guide for water environment governance of small watersheds in southern China is composed of "small watershed water environment survey + external pollution control + internal pollution treatment + water quality improvement". The technical guide for water environment governance of small watersheds in southern China includes: - Small watershed water environment survey, mainly including survey units and survey content; - Small watershed water environment treatment - external pollution control, mainly involving point source pollution control (such as domestic pollution source control and industrial pollution source control), non-point source pollution control (such as urban non-point source pollution control and agricultural non-point source pollution control), and drainage system modification measures (such as rainwater and sewage separation modification and drainage pipe network modification); - Small watershed water environment treatment - internal pollution treatment, mainly including in-situ treatment of sediment and off-site treatment of sediment (such as ecological dredging technology); - Small watershed water environment treatment - water quality improvement, mainly involving physical water quality improvement measures (such as water replenishment and aeration), chemical water quality improvement measures

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