Hydraulic Modelling Of Drip Irrigation Systems
Used For Grass Establishment On Steep Slopes
Author(s)
Y. Gyasi-Agyei
Abstract
Erosion damage to railway embankment and cutting steep slopes (batters) causes
a significant cost of remediation within the coal railway network of Central
Queensland, Australia. It has been established that grass cover of 60% reduces
erosion by over 90%. Given that water is a scarce commodity in the semi-arid
environment, a more efficient water use cost-effective drip irrigation system is
imperative. The hydraulic modelling of drip irrigation systems design is
presented. It takes into account the velocity head change and a proper selection
of the friction coefficient formula based on the Reynolds number. Fittings and
emitter insertion head loss are incorporated into the hydraulic model. A case
study of the use of the hydraulic model to analyse the drip irrigation systems is
presented.
Keywords: steep slopes, drip lateral, irrigation, hydraulics, embankment, grass
establishment.
1 Introduction
Erosion of railway embankment and cutting batters within Central Queensland,
Australia, increases maintenance costs, risks of outages and derailments,
interruptions of normal train operations and environmental degradation. The QR
(Queensland Rail) funded HEFRAIL Research Project with Central Queensland
University has demonstrated that 60% grass cover on railway embankment
batters reduces erosion by over 90% compared with the bare scenario. Further
increase in grass cover increases the erosion reduction up to 99% [1–3]. Drip
irrigation systems, consisting of laterals with equally spaced emitters and
uniform slope, have been identified as an integral part of grass establishment to
Keywords
steep slopes, drip lateral, irrigation, hydraulics, embankment, grass
establishment.
Related Book
Other papers in this volume
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