HOMS COMPONENT

TECHNICAL STANDARD FOR MEASURING RIVER FLOW AND SEDIMENT BY HYDROMETRIC CABLEWAY

1.   Purpose and objectives

     To standardize the construction of hydrometric cableways throughout the country and thus improve the quality of hydrometric data.

2.   Description

     The standard contains seven chapters and five annexes:

     Chapter 1.  General provisions: makes express provisions for many problems with universality, arising in the course of establishment and operation of cableways.

     Chapter 2.  Cableway installation: describes the structural forms, layout principles and driving methods of cableways, signalling, recording and controlling equipment, lightning arrestors, etc. and provides technical information on standardization.

     Chapter 3.  Distance measurement: describes methods and operating procedures for measuring horizontal distances from the initial point to verticals.

     Chapter 4.  Depth measurement: describes two methods of sounding, by sounding weight and by ultrasonic sounder.

     Chapter 5.  Velocity measurement: describes three measuring methods: point-integrated, width-integrated and depth-integrated methods.

     Chapter 6.  Sediment measurement: describes the selection of sampling devices and methods.

     Chapter 7.  Maintenance and inspection of cableways.

     The five annexes cover the following: the technical file for a cableway; tables of correction for angularity; tables of depth, velocity and sediment measurements by cableway; tables used for various comparative measurements; and instructions for completing the technical file for a cableway.

3.   Input

     Not applicable.

4.   Output

     Data on river flow and sediment.

5.   Operational requirements and restrictions

     This component is used for hydrological stations equipped with cableway installation. Operating personnel should be given regular training and assessment of technical proficiency.

6.   Form of presentation

     Publication "Technical Standard for Measuring River Flow and Sediment Using Hydrometric Cableway" in Chinese version or in abbreviated English version.

7.   Operational experience

     Hydrometric cableways have been used in China since the 1950s and have progressively become an important feature of the hydrometric network through uninterrupted innovation for more than 20 years.

     This standard was promulgated by the Ministry of Water Resources and Electric Power, China, in January 1985.

8.   Originator and technical support

     Department of Hydrology, Ministry of Water Resources, P.R.C.

9.   Availability

     From the HOMS National Reference Centre for China.

10.  Conditions on use

     Cost of reproduction and mailing.

Last updated: 1 MAY 90)
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