According to the plan to formulate or revise technical standards of Ministry of Water Resources of the Peopleƴs Republic of China and SL 1—2002 Compilation Requirements Specifacation for the Drafting of Technical Standards of Water Resources，SL 172—96 Technical Specification for Construction of Small Hydropower Stations is revised．

The specification contains 7 chapters，22 sections，248 articles，and 10 annexes．The main contents are as follows：

—General technical regulations．

—Technical regulations for construction of hydraulic structures．

—Technical regulations for installation of metal structures and hydroelectric generating units．

—Technical regulations for installation of switching stations．

—Technical regulations for construction of automatic hydrological telemetry systems．

—Technical regulations for safety monitoring．

Revisions of the previous specification are as follows：

—Structure of the specification is adjusted．

—Requirements of construction survey are adjusted．

—Relevant contents of cavern excavation are added．

—Relevant contents of antiseepage treatment for boring wells are added．

—Relevant contents of stonemasonry with concrete and drylaid concrete precast blocks are added．

—Relevant contents of electrical equipment installation are added．

—Relevant contents of equipment installation of automatic control are added．

—Relevant contents of switching station installation are added．

—Relevant contents of equipment installation of automatic hydrological telemetry system are added．

—Relevant contents of equipment installation of safety monitoring are added．

This specification replaces the previous version SL 172—96.

This specification is approved by Ministry of Water Resources（MWR）of the Peopleƴs Republic of China．

This specification is interpreted by Bureau of Rural Hydropower and Electrification Development of MWR．

This specification is chiefly drafted by National Research Institute for Rural Electrification of MWR．

This specification is published and distributed by China Water＆Power Press．

Chief drafters of this specification are Shi Rongqing，Fan Xinzhong，Lv Yan，Chen Changjie，Xia Weicai，Zhou Jianxiong，Zhang Yong，Liu Qingwen，Hu Song，Qin Zhongjian，Ren Suming，Hua Qiang，Shi Shizhong，and Pan Renyou．

The technical responsible person of this specification review meeting is Yang Jiong．

The format examiner of this specification is Mu Guangcheng．