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GB/T 21303-2017: Specifications for water measurement of irrigation canal system
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GB/T 21303-2007	English	RFQ	ASK	10 days [Need to translate]	Specification for water measuring of irrigation canal system

GB/T 21303-2017: Specifications for water measurement of irrigation canal system

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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. ...