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GB/T 21303-2017: Specifications for water measurement of irrigation canal system
Status: Valid GB/T 21303: Evolution and historical versions
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Specifications for water measurement of irrigation canal system
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Basic data | Standard ID | GB/T 21303-2017 (GB/T21303-2017) | | Description (Translated English) | Specifications for water measurement of irrigation canal system | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | P57 | | Classification of International Standard | 93.160 | | Word Count Estimation | 86,838 | | Date of Issue | 2017-11-01 | | Date of Implementation | 2018-05-01 | | Older Standard (superseded by this standard) | GB/T 21303-2007 | | Regulation (derived from) | National Standard Announcement 2017 No. 29 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 21303-2017: Specifications for water measurement of irrigation canal system---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Specifications for water measurement of irrigation canal system
ICS 93.160
P57
National Standards of People's Republic of China
Replacing GB/T 21303-2007
Irrigation canal systems - Quantity water specification
Posted.2017-11-01
2018-05-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Foreword V.
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 irrigation channel system water station network layout 3
4.1 General Provisions 3
4.2 station layout 4
5 water method 4
5.1 water method 4
5.2 water facilities 4
6 basic elements of water 5
6.1 water level measurement 5
6.2 Flow rate measurement 5
7 flow meter water 6
7.1 General provisions 6
7.2 vertical layout 6
7.3 Section Measurement 7
7.4 Flow rate measurement 7
7.5 Section flow calculation 8
8 standard cross section water 10
8.1 General Provisions 10
8.2 The relationship between water level and its rate set 10
9 canal system construction water 11
9.1 General Provisions 11
9.2 Culvert gate water 11
9.3 inverted siphon water 14
9.4 fall water 15
9.5 Aqueduct volume of water 17
Quantity of weir water 18
10.1 General Provisions
10.2 thin-walled weir 18
10.3 amount of water threshold 23
11 amount of water tank 26
11.1 General Provisions
11.2 Parshall slot 26
11.3 Rectangular non-throat volume 28
11.4 Parabolic Throat Volume Sink 30
11.5 Straight Wall Sinks 33
11.6 Airfoil Sluices 35
11.7 Long Throat Capacity Sinks 36
12 meter water 39
12.1 General Provisions 39
12.2 float-type water level gauge 40
12.3 pressure gauge 40
12.4 ultrasonic water level gauge 41
12.5 electronic water gauge 41
12.6 Telemetry water level gauge 41
12.7 Water meter 42
12.8 Electromagnetic Flowmeter 43
12.9 Ultrasonic flowmeter 43
12.10 Other water meters 43
13 Observation Implementation and Data Consolidation 43
13.1 General Provisions 43
13.2 Requirements for water work 44
13.3 Quantity of water finishing 44
13.4 Water Facilities Maintenance 44
Appendix A (normative) units of measurement and symbols 45
Appendix B (Informative) Current meter flow measurement records 46
Appendix C (Informative) Flow Measurement Uncertainty Estimation 47
Appendix D (Normative) Culvert flow formula
Appendix E (Informative) Culvert Flow Coefficient 57
Appendix F (Normative) Standard amount of water and parabolic throat Sink size, critical depth and flow coefficient coefficient table 59
Appendix G (informative) Long throat design and calculation 62
Appendix H (Informative) Other water meter 78
References 79
Figure 1 Flow cross-sectional area of the schematic diagram 9
Figure 2 open channel vertical single-hole flat gate schematic 11
Figure 3 rectangular dark culvert vertical single-hole flat gate schematic 12
Figure 4 circular dark culvert single plate flat gate 12
Figure 5 Open Channel Rectangular rectangular flat gate schematic 12
Figure 6 single-hole flat-arc brake schematic 13
Figure 7 thin-walled weir ridge sharp edge processing Figure 18
Figure 8 triangular thin-walled weir schematic 19
Figure 9 rectangular thin-walled weir schematic 20
Figure 10 Trapezoidal water weir and its water flow diagram 21
Figure 11 parabolic mobile weir plate structure 23
Figure 12 horizontal and vertical cross-section of the water cut diagram 24
Figure 13 Cd and h1/L1 as a function of Figure 25
Figure 14 Schematic diagram of the standard Parshall trough structure
Figure 15 Rectangular structure without throat section volume 28
Figure 16 Free flow coefficient K1 and index n1 curve 29
Figure 17 parabolic throat volume sink schematic 30
Figure 18 Straight Wall Sink Structure Figure 34
Figure 19 Schematic diagram of the wing-shaped tank (trapezoidal channel) 35
Figure 20 Trapezoidal Long Throat Schematic 37
Figure 21 Measurement section cross section and control section upstream view 39
Figure 22 Cv and the ratio α1CDA */A1 as a function of the 39
Figure G.1 Long throat design steps 62
Figure G.2 (Figure G.2) 67
Figure G.3 (Table G.3 attached)
Figure G.4 (Table G.4 attached) 71
Figure G.5 long throat calculation diagram (assuming α1 = αc = α2 = 1.0) 72
Figure G.6 Long-throat tank non-submergence limit test calculation flow chart 72
Figure G.7 Functional relationship between Cd and H1/L Figure 73
Figure G.8 Function Diagram 73
Figure G.9 Trial calculation of long throat flow
Table 1 vertical flow velocity measurement point distribution location 7
Table 2 different depth of the speed method 8
Table 3 standard cross section water level flow rate error rate limit 10
Table 4 inverted siphon local resistance coefficient table 15
Table 5 Rectangular and Taiwan weir water flow coefficient M Table 16
Table 6 Trapezoidal Falls flow coefficient M Table 16
Table 7 Right-angle triangular amount of weir structure size 19
Table 8 Trapezoidal thin-wall weir geometry size relationship 21
TABLE 9 Parshall Sink Size Table 27
Table 10 without throat size sink size table 28
Table 11 Free-flow coefficient and index of non-throat section flume Table 29
Table 12 No-throat volume sink submerged flow coefficient, index and critical submergence (St) Check Table 30
Table 13 U-shaped channel parameters and the amount of sink contraction ratio ε (roughness n = 0.015) 31
Table 14 different channels of wing-shaped flume flow equation 36
Table 15 Metering Table (Level A) 42
Table A.1 units of measurement and symbols 45
Table B.1 flow meter flow recording and calculation table 46
Table C.1 X'm values Table 48
Table C.2 X'e values Table 48
Table C.3 X'p values Table 48
Table C.4 X'c values Table 48
Table C.5 t value of 95% confidence level Table 50
Table C.6 Xc values Table 51
Table C.7 head h and size uncertainty b 52
Table C.8 Rectangular, trapezoidal, U-shaped channel flow test uncertainty estimates γ, β, ψ numerical Table 52
Table D.1 gate flow under the form of fully open sluice flow calculation formula 54
Table D.2 Flow control formula of gate with gate control flow 54
Table D.3 Computation formula of sluice gate flow with pressurized water flow
Table E.1 Flow coefficient of culverts with different flow patterns and different types of wing walls 57
Table E.2 Flow coefficient of gate with different flow pattern and different wing wall type 57
Table E.3 Culverts and sluices No sluice in sluice Flooding coefficient 58
Table F.1 various types of sink parameters and the scope of application and standard amount of water flow coefficient of 59
Table F.2 Rectangular and Trapezoidal Channels Channel Slope Critical Water Depth Calculation Table --- hc/h1 as a function of Channels m and h1/B Table 60
Table F.3 standard parabolic throat size Sink size and flow coefficient coefficient table 61
Table G.1 Long throat volume Sink water level - flow relationship 64
Table G.2 Trapezoidal control section hc/H1 as a function of m and H1/bc 65
Table G.3 Determination of long throat flume with circular section wide crest Table 67
Table G.4 Determination of flow in crest of pipe 69
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 21303-2007 "Irrigation Channel System Quantity Water Specifications", compared with GB/T 21303-2007, in addition to editorial
Modification and modification of accuracy, the original standard framework and structure were adjusted with the following main technical contents.
--- The terms and definitions, revised to 30, of which 27 reservations improve, add 3, delete 27;
--- To retain and improve the GB/T 21303-2007 reflect the characteristics of irrigation channel system water characteristics of the "
Layout "" standard cross-section of the amount of water "and" canal system of building water "and other major content;
--- Added "volume of water method" and "volume of water basic elements" two chapters;
--- "GB/T 21303-2007 in the" weir tank water "were set to" the amount of weir water "and" the amount of water tank "chapter;
--- Add "U-shaped channel parabolic shaped weir plate" in the amount of weir weir water to amend the "long throat amount of water tank" on the "amount of water threshold," the inclusion
Relationship, the "amount of water" into the amount of water weir water;
--- In the amount of water tank volume added "wing-type sink" and "long throat amount of water tank" methods and requirements of water to strengthen the irrigation channels
The main method of measuring the amount of water in the system sink;
--- In the "instrument water" new "electronic water gauge" amount of water methods and requirements to meet the irrigation channel system of automated water and water
The use of environmental technology requirements;
--- In recent years, some new overseas water measuring equipment and some domestic traditional water measuring methods are listed as informative;
--- GB/T 21303-2007 Chapter 10 "Estimation of the uncertainty of flow measurement" as an information appendix to be listed;
--- "Observations and data processing to replace" GB/T 21303-2007 "irrigation canal water management" and delete the original standard
In the provisions of administrative regulations, highlighting the technical requirements of canal water.
This standard is proposed and managed by the Ministry of Water Resources.
This standard drafting unit. China Irrigation and Drainage Development Center, China Agricultural University, Northwest A & F University, Wuhan University, Hebei Province, stone
Tianjin Irrigation District Authority, Zhejiang Institute of Hydraulic Estuaries, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Jing Hui Irrigation District of Shaanxi Province Authority.
The main drafters of this standard.Xie Chongbao, Zhang Xin, Li Tianguang, Qiu Liuchao, Ma Xiaoyi, Wang Xiaoling, Guan Guanghua, Guo Zongxin, Zheng Shizong, peak,
Party Yongren.
This standard replaces the standards previously issued as.
--- GB/T 21303-2007.
Irrigation canal systems - Quantity water specification
1 Scope
This standard specifies the main technical requirements of irrigation water channel system, the main water facilities and instruments used, requirements and indicators.
This standard applies to new construction, expansion, reconstruction and construction of irrigation channel system of water, also applies to the drainage system of water.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 778 (all parts) closed pipe water flow measurement
GB/T 11828 (all parts) water level measuring instruments
Basic terminology and symbolic standards for hydrology GB/T 50095-2014
GB 50179 River flow test specification
CJ/T 122 ultrasonic Doppler flowmeter
JB/T 9248 electromagnetic flowmeter
SL56 Rural water conservancy technical terms
SL482 Irrigation and drainage system design code
ISO 772 Hydrographic Terms and Symbols (Hydrometry-vocabularyandsymbols)
3 Terms and definitions
GB/T 50095-2014, SL56, ISO 722 define the following terms and definitions apply to this document. For ease of use, repeat
The following terms and definitions are listed.
3.1
Irrigation canal system irrigationcanalsystem
A network of fixed irrigation channels consisting of main canals, branch channels, ditches, agricultural ditches and their ancillary buildings.
3.2
Amount of water watermeasurement
The process of determining the physical quantity of a body of water that passes through a given section over time.
3.3
Water gauge staffgauge
Installed in the station used to observe the water level of channel water scale.
3.4
Weir crest headovertheweir
The height of the body of water above the lowest point of the weir measured at a point upstream of the weir.
3.5
Discharge
The volume of water passing through a certain cross section of river, channel or pipeline within a unit time.
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