GB/T 21303-2017Specifications for water measurement of irrigation canal system (English PDF)

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.

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 document. 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.