Impact Of Rainwater Harvesting On
Catchment Hydrology: Case Study Of
The Modder River Basin, South Africa
Author(s)
E. Pretorius, Y. E. Woyessa, S. W. Slabbert & S. Tetsoane
Abstract
The river basin is increasingly acknowledged as the appropriate unit for the
analysis and management of water resources, especially as water availability at
the basin level becomes the primary constraint to agriculture. The Modder River
basin is located within the Upper Orange Water Management Area in central
South Africa. The irrigated agriculture in the basin draws water mainly by
pumping out of river pools and weirs, whilst the rural small-scale farmers rely on
rain-fed agriculture for crop production. In the past few years the Institute for
Soil, Climate and Water of the Agricultural Research Council has been
developing water harvesting techniques for small farmers in the basin with the
objective of harnessing rainwater for crop production. This technique has
resulted in a significant increase in crop yield compared to conventional
practices and it is therefore expected that this practice will be adopted on a wider
scale in the Modder River basin. The purpose of this project is to investigate and
determine the impact of wider use of this practice on watershed hydrology and
also the impact downstream of the river basin if the technique is applied on a
wider scale.
Keywords: rainwater harvesting, watershed management, crop production,
hydrological modelling.
1 Introduction
In a new paradigm shift related to integrated water resources management
(IWRM) in the context of a river basin, attention is being drawn to consider the
upstream \“off-site” influences on the various water use entities, as well as the
Keywords
rainwater harvesting, watershed management, crop production,
hydrological modelling.
Related Book
Other papers in this volume
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