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Water 2015, 7(4), 1402-1421; doi:10.3390/w7041402

Rainwater Harvesting for Small-Holder Horticulture in Namibia: Design of Garden Variants and Assessment of Climate Change Impacts and Adaptation

1
Institute for Social-Ecological Research (ISOE), Hamburger Allee 45, Frankfurt am Main 60486, Germany
2
Institute of Physical Geography, Goethe University, Altenhöferallee 1, Frankfurt am Main 60438, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Ataur Rahman
Received: 20 December 2014 / Revised: 27 February 2015 / Accepted: 5 March 2015 / Published: 30 March 2015
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Abstract

The design of rainwater harvesting based gardens requires considering current climate but also climate change during the lifespan of the facility. The goal of this study is to present an approach for designing garden variants that can be safely supplied with harvested rainwater, taking into account climate change and adaptation measures. In addition, the study presents a methodology to quantify the effects of climate change on rainwater harvesting based gardening. Results of the study may not be accurate due to the assumptions made for climate projections and may need to be further refined. We used a tank flow model and an irrigation water model. Then we established three simple climate scenarios and analyzed the impact of climate change on harvested rain and horticulture production for a semi-arid region in northern Namibia. In the two climate scenarios with decreased precipitation and medium/high temperature increase; adaptation measures are required to avoid substantial decreases in horticulture production. The study found that the most promising adaptation measures to sustain yields and revenues are a more water efficient garden variant and an enlargement of the roof size. The proposed measures can partly or completely compensate the negative impacts of climate change. View Full-Text
Keywords: rainwater harvesting; gardening; climate change; adaptation; scenario; semi-arid; Namibia rainwater harvesting; gardening; climate change; adaptation; scenario; semi-arid; Namibia
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Woltersdorf, L.; Liehr, S.; Döll, P. Rainwater Harvesting for Small-Holder Horticulture in Namibia: Design of Garden Variants and Assessment of Climate Change Impacts and Adaptation. Water 2015, 7, 1402-1421.

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