Determination of Tile Drain Discharge under Variable Hydraulic Conditions

The aim of this study was an investigation of tile drain flow velocity under variable hydraulic conditions and of tile drain discharge using an ultrasonic flow meter. There is an essential variance between velocity values measured by an ultrasonic flow meter and reference values determined by a labo...

Full description

Saved in:
Bibliographic Details
Published inWater (Basel) Vol. 11; no. 1; p. 120
Main Authors Szejba, Daniel, Bajkowski, Sławomir
Format Journal Article
LanguageEnglish
Published MDPI AG 01.01.2019
Subjects
drain discharge
flow velocity
ultrasonic flowmeter
Poland
California
Online AccessGet full text

Cover

More Information
Summary:The aim of this study was an investigation of tile drain flow velocity under variable hydraulic conditions and of tile drain discharge using an ultrasonic flow meter. There is an essential variance between velocity values measured by an ultrasonic flow meter and reference values determined by a laboratory method. Differences result from specific measurement conditions, which appear in drainage pipe systems. The values of velocity measured by ultrasonic flow meters were higher than the reference values for three examined flow phases: Free, transient, and pressured flow. The discharge from a tile drain working on a partially filled up pipe in no-pressure conditions should be calculated by an adapted equation based on the California pipe method, whereas the discharge from a completely filled up drain pipe working over pressure should be calculated as a ratio between 0.428 times the measured velocity and the pipe cross-section area.
ISSN:2073-4441
2073-4441
DOI:10.3390/w11010120