- GB50071-2014小型水力发电站设计规范（英文版）
- 中国工程建设标准化协会
- 7字
- 2021-03-31 18:30:21
5 Layout of Project and Hydraulic Structures
5.1 General Requirements
5.1.1 The scales of projects and the grades of structures shall meet the following requirements:
1 Scales of hydropower stations shall be classified as Scale IV and Scale V depending on their sizes.The classification shall be defined according to the provisions as shown in Table 5.1.1-1.
Table 5.1.1-1 Scales of Hydropower Stations
Notes:1 Total storage capacity of reservoir refers to the static storage volume below the maximum stage of reservoir.
2 For a multi-purpose water and hydropower project，if different scales are given for its different purposes，the highest one shall be taken as the scale of the project.
3 1mu=666.7m2.
2 The grades of hydraulic structures shall be defined according to the scales of projects as shown in Table 5.1.1-2.
Table 5.1.1-2 Grades of Hydraulic Structures
3 If the dam heights exceed those as stated in Table 5.1.1-3，their grades may be raised by one grade，but the standards for flood control may keep unchanged.
Table 5.1.1-3 Indices for Raising Grade of Reservoir Dams
Notes:1 If hydraulic structures are built under complicated engineering geological conditions，or new dam type and new structures are adopted，the dam grade may be raised by one grade，but the standards for flood control are kept unchanged.
2 If the total storage capacity of reservoir is larger than or equal to 10 million m3，the earth-rock dam is higher than 50m，the concrete dam and the stone masonry dam are higher than 70m，or the grade of structure is higher than Grade 4 for some reasons，the design of their water retaining and releasing structures shall be in compliance with the provisions of current relevant national standards as well.
5.1.2 The flood control standard for hydraulic structures shall be in compliance with the following requirements:
1 The flood control standards for hydraulic structures of reservoir projects shall be determined according to the specifications in Table 5.1.2.
Table 5.1.2 Flood Control Standards for Hydraulic Structures of Reservoir Projects
2 If the water retaining height of permanent structures of a hydropower project in mountainous or hilly areas is less than 15m and the difference between upstream and downstream water heads is less than 10m，the flood control standard should be set up as that stipulated for plain and coastal regions.If the water retaining height of the permanent structures of a hydropower project on plains or in coastal regions is above 15m and the difference between upstream and downstream water heads is more than 10m，the flood control standard should be set up as same as that stipulated for mountainous and hilly area.
3 If a failure of an earth-rock fill dam would result in fatal disaster to the downstream area，the check flood standard for Grade 4 structures may be raised by one grade.
4 For water retaining and releasing structures with lower water head or their failures would not result in big losses，their check flood standards may be lowered by one grade after being deliberately assessed and submitted for approval of competent authorities.
5.1.3 The flood control standard for non-retaining powerhouse in mountainous or hilly areas shall be determined according to the grades as shown in Table 5.1.3.For the powerhouse of a hydropower station in river channel，the flood control standard for its water retaining parts shall be consistent with that for the main water retaining structures，and the flood control standards for auxiliary rooms，main transformer yard，switchyard and access to powerhouse shall be set up according to Table 5.1.3.The flood control standard for powerhouse on plains or in coastal region shall be determined in accordance with Table 5.1.2.
Table 5.1.3 Flood Control Standards for Non-retaining Powerhouses
5.1.4 The types of hydropower stations may be categorized into dam type，diversion type and composite type according to their development patterns.
5.1.5 For areas where the seismic intensity reaches 7 degree or above，the anti-seismic design shall be carried out for the hydraulic structures.
5.1.6 For general layout of a project and the design of hydraulic structures，the following basic data should be made available according to the specific situation of the project:
1 Items and scales of topographical mapping that may be selected according to the provisions are given in Table 5.1.6.
Table 5.1.6 Items and Scales of Mapping
Notes:Scale of geological mapping should be consistent with that of the topographical mapping in the same area.
2 Engineering geological investigation report and drawings.
3 Meteorological and hydrological data，calculation result of hydraulic and waterpower energy.
4 Data for river basin planning and comprehensive utilization of water resources.
5 Data for environmental protection，soil and water conservation.
6 Data for hydraulic machinery，electrical system and hydromechanical structures.
7 Data for construction conditions.
8 Relevant approval documents from superior competent authorities.