Development Of A Crop Water Use Module For
The WAS Program To Determine Scheme-level
Irrigation Demand
Author(s)
I. van der Stoep1 & N. Benadé2
Abstract
The water use sector in South Africa is currently implementing the National
Water Act (Act 36 of 1998), which requires, amongst other things, improved
planning of expected water demands. A need was identified for the development
of a computer model that can assist Water User Associations (WUAs) to easily
and effectively capture data for management and planning purposes. The
existing Water Administration System (WAS) computer program was used and a
new module developed to capture data and perform calculations so that irrigation
demand can be determined for different time periods (daily, seasonally, annually,
etc.) and management levels (field, farm, and scheme). The crop yield (ton/ha)
can also be captured at the end of a growing season and used to calculate the
total yield (ton) and the yield per unit of water (g/m3). A summary of water
demand for a specified period can easily be generated per crop type, and all the
crop water demand information can easily be linked to a geographic information
system (GIS). The module was implemented at the Orange-Riet WUA where it
is used to model irrigation demand for 16700 ha of mixed crops irrigated from
river and canal distribution systems.
Keywords: irrigation planning, crop water requirements, WAS program, water
conservation and demand management.
1 Introduction
South Africa is a semi-arid country where water is of critical strategic
importance to all development, in any sector of the economy. Recognising the
Keywords
irrigation planning, crop water requirements, WAS program, water
conservation and demand management.
Related Book
Other papers in this volume
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