GB/T 38906-2020. Low impact development stormwater management and harvest-Facility classification.
1 Scope
GB/T 38906 specifies the classification principles, code structure and coding method, facility classification code and name of low impact development stormwater control and utilization facilities.
GB/T 38906 applies to the classification and coding of low impact development stormwater control and utilization facilities.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Low impact development
It emphasizes that urban development should reduce the impact on the environment. Its core is to build drainage projects that are compatible with nature based on the concept of source control and reduction of impact load, reasonably use space and take corresponding measures to control storm runoff and reduce urban runoff pollution.
Note: Rewrite GB 50014-2006 (2016 edition), definition 2.1.8B.
2.2
Stormwater management and harvest
General term for reducing the total amount and peak value of runoff and reducing runoff pollution in urban areas and collecting and reusing rainwater.
Note 1: Rewrite GB 50400-2016, definition 2.1.1.
Note 2: Including rainwater infiltration, collection and reuse, regulation, interception and purification, and transfer.
3 Classification principles
3.1 Principle of consideration
Focus on the main functions of low-impact development rainwater control and utilization facilities, and take into account the control objectives.
3.2 Principle of scalability
Rainwater control and utilization facilities for low-impact development that are not included in this standard can be coded according to the coding method.
4 Code structure and coding method
4.1 Code structure
Using the line classification method, low-impact development rainwater control and utilization facilities are divided into three levels: large category, medium category and small category, as shown in Figure 1.
4.2 Coding method
A hierarchical coding method is adopted, which consists of 6 Arabic numeral codes. The codes for each layer are:
-The first layer is for large-category facilities, represented by a 2-digit code;
-The second layer is for medium-category facilities, represented by a 2-digit code for the first layer + a 2-digit code for the second layer, a total of 4-digit codes;
-The third layer is for small-category facilities, represented by a 2-digit code for the first layer + a 2-digit code for the second layer + a 2-digit code for the third layer, a total of 6-digit codes;
-From the first layer to the third layer, in principle, each layer is a two-digit sequential code from 01 to 99, and the facilities containing "others" are the accommodation items of the facilities on the previous layer, represented by the code "99";
-When there is no further subdivision from the second layer, the following code is supplemented with "00" to the third layer.
This standard specifies the classification principles, code structure and coding method, facility classification code and name of low-impact development rainwater control and utilization facilities. This standard applies to the classification and coding of low-impact development rainwater control and utilization facilities.

ICS35.040
National Standard of the People's Republic of China
GB/T38906—2020
Low impact development stormwater management and utilization
Facility classification
Low impact development stormwater management and utilization harvest-Facilityclassification
Issued on 2020-06-02
State Administration for Market Regulation
National Standardization Administration
Issued
Implementation on 2020-12-01
Foreword
Scope
Terms and definitions
Classification principles
Code structure and coding method
Facility classification code and name
Performance of rainwater control and utilization facilities for low-impact development Appendix A (Informative Appendix) 1
References··.····.
GB/T38906—2020
Foreword
This standard was drafted in accordance with the rules given in GB/T1.1—2009. This standard was proposed and managed by the China National Institute of Standardization. GB/T38906—2020
The drafting units of this standard are: China National Institute of Standardization, Beijing University of Civil Engineering, Fuzhou Leyi Ecological Technology Co., Ltd., Beijing Institute of Landscape and Ancient Architecture Design Co., Ltd., Tsinghua University Architectural Design Institute Co., Ltd., Qingdao Institute of Standardization, Renchuang Ecological and Environmental Protection Technology Co., Ltd., Shenzhen Batian Ecological Engineering Co., Ltd., Beijing Urban Drainage Group Co., Ltd. The main drafters of this standard are: Yun Zhenyu, Li Junqi, Hu Liangbing, Zhang Wei, Tan Qiqi, Wu Meiqiang, Zhou Jianbin, Zhu Zhihong, Liu Jiuling, Xu Jing, Sheng Tiantian, Tao Xiaoyan, Zhang Yi, Chen Meijuan, Li Mengjie, Meng Lingyi, Huang Peizhao, Jin Xiaoshi, Zheng Jiang, Zhang Jianxin, You Shenghua. m
1 Scope
Rainwater control and utilization for low impact development
Facility classification
GB/T38906—2020
This standard specifies the classification principles, code structure and coding method, facility classification code and name of rainwater control and utilization facilities for low impact development.
This standard applies to the classification and coding of rainwater control and utilization facilities for low impact development. Terms and definitions
The following terms and definitions apply to this document. 2.1
Low impact development
lowimpactdevelopment
It emphasizes that urban development should reduce the impact on the environment. Its core is to build drainage projects that are compatible with nature based on the concept of source control and reducing impact loads, rationally use space and take corresponding measures to control storm runoff and reduce urban runoff pollution. Note: Rewrite GB50014-2006 (2016 edition), definition 2.1.8B2.2
Stormwater control and utilization
Stormwater management and harvest is a general term for reducing the total amount and peak value of runoff in urban areas and reducing runoff pollution and collecting and reusing rainwater. Note 1: Rewrite GB50400-2016, definition 2.1.1 Note 2: Including rainwater infiltration, collection and reuse, regulation, interception and purification, and transfer. 3 Classification principle
Compatibility principle
Focus on the main functions of low-impact development rainwater control and utilization facilities, while taking into account the control objectives. 3.2
Scalability principle
Low-impact development rainwater control and utilization facilities that are not included in this standard can be coded according to the coding method. Code structure and coding method
Code structure
Using the line classification method, low-impact development rainwater control and utilization facilities are divided into three levels: major category, medium category and minor category, as shown in Figure 1. Minor category code
Medium category code
Major category code
Low-impact development rainwater control and utilization facility classification code structure diagram 1
GB/T38906—2020
Coding method
A hierarchical coding method is adopted, consisting of 6-digit Arabic numeral codes. The codes for each layer are as follows: the first layer is for major facilities, represented by a 2-digit code; the second layer is for medium-class facilities, represented by a 2-digit code for the first layer plus a 2-digit code for the second layer, a total of 4-digit codes; the third layer is for minor facilities, represented by a 2-digit code for the first layer plus a 2-digit code for the second layer plus a 2-digit code for the third layer, a total of 6-digit codes;
In principle, from the first layer to the third layer, each layer is a two-digit sequential code from 01 to 99, and the facilities containing "others" are the accommodation items of the facilities on the previous layer, represented by the code "99";
When there is no further subdivision from the second layer, the following code is supplemented with "00" to the third layer. 5 Facility classification code and name
The classification code and name of low-impact development rainwater control and utilization facilities are shown in Table 1, and the performance of low-impact development rainwater control and utilization facilities is shown in Record A.
Table 1 Classification code and name of rainwater control and utilization facilities in low-impact development Facility code
010000
010100
010101
010102
010103
010104
010105
010200
010201
010202||tt| |010203
010204
010300
010400
010401
010402
010500
Facility name
Seepage facilities
Permeable pavement
Permeable brick pavement
Permeable cement concrete pavement
Permeable asphalt concrete pavement
Structural permeable pavement
Grass-embedded permeable pavement
Bioretention
Bioretention zone
Rainwater garden
Ecological tree pool
High flower bed
Sunken green space
Green roof
Simple green roof
Garden-style green roof
Infiltration pond
Applicability description
Applicable to squares, parking lots and municipal roads at all levels and roads and parks in building communitiesApplicable to squares, parking lots, sidewalks and non-motorized vehicle roadsApplicable to squares, parking lots, sidewalks and non-motorized vehicle roads, and can also be used for motor vehicle lanesApplicable to squares, parking lots, sidewalks and non-motorized vehicle roads, and roads and parks in building communities
Applicable to squares, parking lots, roads and parks in building communities Applicable to green areas around buildings, roads and parking lots in residential areas, as well as in urban green areas such as park green areas and green belts of urban roads
Applicable to green areas around buildings, roads and parking lots in residential areas, as well as in urban green areas such as green belts of urban roads
Applicable to tree pools for street trees, and can also be used for tree pools in residential areas, park green areas and squaresApplicable to flower beds around buildings, and used in conjunction with building rainwater downpipesApplicable to green areas in urban residential areas, park green areas, roads and squaresApplicable to flat-roofed buildings and sloping-roofed buildings with a slope of ≤15° that meet the conditions of roof load and waterproofingApplicable to roofs of buildings with low roof structure loads and no peopleApplicable to roofs of buildings with high roof structure loads and used as resting placesApplicable to regional facilities with large catchment areas, certain space and good infiltration conditions Code
010600
019900
020000
020100
020200
029900
030000
030100
030200
030300
030400
030500
03990 0
040000
040100
040200
040300
040301
040302
040303
040304
040305
040306
040400
040500
040501| |tt||040502
049900
050000
Infiltration well
Others
Facility name
Storage and utilization facilities
Reservoir
Rainwater tank
Others
Regulation and storage facilities
Regulation pond (dry pond)
Wet pond
Regulation pond
Combined sewer overflow regulation and storage tank|| tt||Multi-function adjustment
Others
Sewage interception and purification facilities
Artificial soil infiltration
Vegetation buffer zone
Ecological revetment
Natural earth slope revetment
Wooden pile revetment
Gabion revetment
Interlocking grass brick revetment
Block revetment
Ecological block revetment
Rainwater wetland
Sedimentation tank
Swirl Grit chamber
Horizontal grit chamber
Others
Transfer facilities
Table 1 (continued)
Applicability description
GB/T38906—2020
Applicable to parks and green spaces, and green spaces around buildings, roads and parking lots in residential areas. Applicable to residential areas, parks and green spaces, road squares, etc. with rainwater reuse needs. Applicable to the collection and utilization of rainwater on the roofs of individual buildings, and can also be used for the collection and reuse of rainwater runoff from urban elevated roads.
Applicable to areas with certain spatial conditions such as residential areas and urban green spaces. Applicable to areas with certain spatial conditions such as residential areas and urban green spaces, and areas with water surface requirements in the non-rainy season.
Applicable to sites with underground space conditions such as residential areas, urban green spaces, and squares. Applicable to areas with combined sewer overflow control needs and good underground space conditions, usually used in conjunction with urban combined sewer systems. Applicable to areas with rainwater runoff regulation needs and good land space conditions, which can provide rest, sports and other functions in the non-rainy season
Applicable to building communities or urban green spaces with certain site conditionsApplicable to the periphery of impervious surfaces such as urban roads or urban water system waterfront green beltsApplicable to urban water systems such as rivers and lakes
Applicable to rivers or lakeside revetments with low flow velocity, small slope, and no high flood control requirementsApplicable to revetments with low flow velocity, no high flood control requirements, and landscape design requirementsApplicable to revetments with low flow velocity, no high flood control requirements, and landscape design requirementsApplicable to revetments with high flow velocity
Applicable to revetments with high flow velocity and landscape design requirementsApplicable to building communities, urban roads, urban green spaces, waterfronts, etc. with certain space conditionsApplicable to areas with large amounts of rainwater and sand that need to meet removal requirementsApplicable to areas with limited space conditions and upstream Drainage canal systems with higher water flow rates are suitable for areas with better spatial conditions3
GB/T38906—2020
Facility code
050100
050101
050102
050103
050200
050300
059900
990000||tt ||Grass-planted ditch
Facility name
Transfer type dry grass-planted ditch
Infiltration type dry grass-planted ditch
Wet grass-planted ditch
Infiltration pipe/channel
Pipeline and ancillary structures
Others
Other technical facilities
Table 1 (continued)
Applicability description
Applicable to roads within building communities, the perimeters of impermeable surfaces such as squares and parking lots, urban roads and urbanUrban green spaces and other areas; can be used in conjunction with stormwater pipes and can also replace stormwater pipes if the site vertical direction allows and does not affect safety.
Applicable to areas where runoff transportation is the main demand. Applicable to areas with good soil permeability and dual demands for runoff transportation and total runoff control. Applicable to areas with dual demands for runoff transportation and runoff pollution control. Applicable to areas with small transfer flow in building communities and public green spaces. Applicable to various sites with rainwater runoff transportation needs. Appendix A
(Informative Appendix)
Performance of rainwater control and utilization facilities for low-impact development. Performance of rainwater control and utilization facilities for low-impact development is shown in Table A.1. Table A.1
Performance table of low-impact development rainwater control and utilization facilities Function
Facility code
010101
010102
010103
010104
010105
010201
010202
010203
010204
010300
010401
010402
010500
010600||t t||Single facility
Permeable brick paving
Permeable cement concrete
Concrete paving
Permeable asphalt concrete
Concrete paving
Structural permeable
Paving
Grass-embedded permeable
Paving
Bioretention zone
Rainwater garden
Ecological tree pool
High flower bed
Sunken green space
Simple green
Roof
Garden green
Roof
Infiltration pond
Infiltration well
Control target
Economy
Landscape effect
GB/T38906—2020
Limitations
Easy to clog, risk of damage by freeze-thaw in cold areas
Water permeability is limited by the permeability of the local original soil
Performance
Easy to be damaged under high load, embedded grass requires long-term maintenance
General
General
In areas where the groundwater level and rock layer are high, the soil permeability is poor, and the terrain is steep, necessary measures such as soil replacement, anti-seepage, and setting steps should be taken to avoid secondary disasters, which will increase construction costs Use
When applied over a large area, it is easily affected by terrain and other conditions
There are strict requirements for roof load, waterproofing, slope, space conditions, etc.
There are strict requirements for roof load, waterproofing, slope, space conditions, etc.
There are strict requirements for site conditions and high requirements for later maintenance and management
The control effect of water quality and water quantity is limited, the purification capacity is low, the water quality requirements are high, and too much suspended solids cannot be combined. Pretreatment needs to be considered5
GB/T38906—2020
Facility code
020100
02020 0
030100
030200
030300
030400
030500
040100
040200
040301
040302
040303
040304
040305
040306
040400
040501
040502
Single Facility
Reservoir
Rainwater
Regulating pond (dry
pond)
Wet pond
Regulating pond
Combined sewer overflow
Regulating reservoir
Multi-function regulating pond
Artificial soil boundary
Infiltration
Vegetation buffer zone
Natural soil slope
Revetment
Wooden pile revetment
Gabion revetment
Interlocking grass brick
Revetment
Block stone revetment
Ecological block
Revetment
Rainwater wetland
Rotary Flow sedimentation tank
Horizontal flow sedimentation tank
Function
Table A.1 (continued)
Control target
Economy
Landscape effect
General
General
General
Limitations
High requirements for construction and operation and maintenance
Small storage volume, limited rainwater purification capacity
Relatively single function
Strict requirements for site conditions, high requirements for construction and operation and maintenance
Relatively single function, high requirements for construction and maintenance, requirements for underground space, transportation High maintenance requirements
High site space requirements
High construction and operation and maintenance requirements
High requirements for site space size, slope and other conditions, and limited runoff control effect
Requirements for water flow velocity, revetment slope, etc.
Requirements for water flow velocity, revetment slope, etc.
High operation and maintenance requirements
High construction and operation and maintenance requirements
Slightly poor landscape effect
High construction and operation and maintenance requirements
High site space requirements
There are flow velocity requirements for upstream water
High site space requirements1
Low-impact development rainwater control and utilization facility performance table function
Facility code
010101
010102
010103
010104
010105
010201
010202
010203
010204
010300
010401
010402
010500
010600
Single facility
Permeable brick paving
Permeable cement concrete
Concrete paving
Permeable asphalt concrete
Concrete paving
Structural permeable
Paving
Grass-embedded permeable
Paving
Bioretention zone
Rainwater garden
Ecological tree pool
High flower bed
Sunken green space
Simple green
Roof
Garden green
Roof
Infiltration pond
Infiltration well
Control target Standard
Economical
Landscape effect
GB/T38906—2020
Limitations
Easy to clog, risk of damage by freeze-thaw in cold areas
Water permeability is limited by the permeability of the local original soil
Easy to be damaged under high load, embedded grass requires long-term maintenance
General
General
In areas where the groundwater level and rock layer are high, the soil permeability is poor, and the terrain is steep, necessary measures such as soil replacement, anti-seepage, and setting steps should be taken to avoid secondary disasters, which will increase construction costs|| tt||When applied over a large area, it is easily affected by terrain and other conditions
There are strict requirements for roof load, waterproofing, slope, space conditions, etc.
There are strict requirements for roof load, waterproofing, slope, space conditions, etc.
There are strict requirements for site conditions and high requirements for later maintenance and management
The control effect of water quality and water quantity is limited, the purification capacity is low, the water quality requirements are high, and too much suspended solids cannot be combined. Pretreatment needs to be considered5
GB/T38906—2020
Facility code
020100
020200| |tt||030100
030200
030300
030400
030500
040100
040200
040301
040302
040303
040304
040305
040306
040400
040501
040502
Single Facility
Water Storage Pool
Rainwater
Regulating pond (dry
pond)
Wet pond
Regulating pond
Combined sewer overflow
Regulating reservoir
Multifunctional regulating pond
Artificial soil boundary
Infiltration
Vegetation buffer zone
Natural soil slope
Revetment
Wooden pile revetment
Gabion revetment
Interlocking grass brick
Revetment
Block stone revetment
Ecological block
Revetment
Rainwater wetland
Swirl Sedimentation tank
Horizontal flow sedimentation tank
Function
Table A.1 (continued)
Control target
Economy
Landscape effect
General
General
General
Limitations
High requirements for construction and operation and maintenance
Small storage volume, limited rainwater purification capacity
Relatively single function
Strict requirements for site conditions, high requirements for construction and operation and maintenance
Relatively single function, high requirements for construction and maintenance, requirements for underground space, operation Maintenance requirements
High
High requirements for site space
High requirements for construction and operation and maintenance
High requirements for site space size, slope and other conditions, and limited runoff control effect
Requirements for water flow velocity, revetment slope, etc.
Requirements for water flow velocity, revetment slope, etc.
High requirements for operation and maintenance
High requirements for construction and operation and maintenance
Slightly poor landscape effect
High requirements for construction and operation and maintenance
High requirements for site space
There are flow velocity requirements for upstream water
High requirements for site space1
Low-impact development rainwater control and utilization facility performance table function
Facility code
010101
010102
010103
010104
010105
010201
010202
010203
010204
010300
010401
010402bzxz.net
010500
010600
Single facility
Permeable brick paving
Permeable cement concrete
Concrete paving
Permeable asphalt concrete
Concrete paving
Structural permeable
Paving
Grass-embedded permeable
Paving
Bioretention zone
Rainwater garden
Ecological tree pool
High flower bed
Sunken green space
Simple green
Roof
Garden green
Roof
Infiltration pond
Infiltration well
Control target Standard
Economical
Landscape effect
GB/T38906—2020
Limitations
Easy to clog, risk of damage by freeze-thaw in cold areas
Water permeability is limited by the permeability of the local original soil
Easy to be damaged under high load, embedded grass requires long-term maintenance
General
General
In areas where the groundwater level and rock layer are high, the soil permeability is poor, and the terrain is steep, necessary measures such as soil replacement, anti-seepage, and setting steps should be taken to avoid secondary disasters, which will increase construction costs|| tt||When applied over a large area, it is easily affected by terrain and other conditions
There are strict requirements for roof load, waterproofing, slope, space conditions, etc.
There are strict requirements for roof load, waterproofing, slope, space conditions, etc.
There are strict requirements for site conditions and high requirements for later maintenance and management
The control effect of water quality and water quantity is limited, the purification capacity is low, the water quality requirements are high, and too much suspended solids cannot be combined. Pretreatment needs to be considered5
GB/T38906—2020
Facility code
020100
020200| |tt||030100
030200
030300
030400
030500
040100
040200
040301
040302
040303
040304
040305
040306
040400
040501
040502
Single Facility
Water Storage Pool
Rainwater
Regulating pond (dry
pond)
Wet pond
Regulating pond
Combined sewer overflow
Regulating reservoir
Multifunctional regulating pond
Artificial soil boundary
Infiltration
Vegetation buffer zone
Natural soil slope
Revetment
Wooden pile revetment
Gabion revetment
Interlocking grass brick
Revetment
Block stone revetment
Ecological block
Revetment
Rainwater wetland
Swirl Sedimentation tank
Horizontal flow sedimentation tank
Function
Table A.1 (continued)
Control target
Economy
Landscape effect
General
General
General
Limitations
High requirements for construction and operation and maintenance
Small storage volume, limited rainwater purification capacity
Relatively single function
Strict requirements for site conditions, high requirements for construction and operation and maintenance
Relatively single function, high requirements for construction and maintenance, requirements for underground space, operation Maintenance requirements
High
High requirements for site space
High requirements for construction and operation and maintenance
High requirements for site space size, slope and other conditions, and limited runoff control effect
Requirements for water flow velocity, revetment slope, etc.
Requirements for water flow velocity, revetment slope, etc.
High requirements for operation and maintenance
High requirements for construction and operation and maintenance
Slightly poor landscape effect
High requirements for construction and operation and maintenance
High requirements for site space
There are flow velocity requirements for upstream water
High requirements for site space
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