Thursday, September 2, 2010
Third day of FANRPAN regional meeting: field visit
The Windhoek Aquifer is located to the south of the city extending northwarts from the Ausa Mountains for 20 to 25 km as far as the city center. Local water resources are very limited and most of the city’s water supply is obtained from surface impoundments located at a distance of tens to hundreds of kilometers from the city.
Large fluctuations in annual rainfall aggravate the situation. The lack of water has led to direct recycling of reclaimed waste water and the implementation of water demand management. During the droughts of 1996, a decision was taken to investigate the feasibility of storing surplus surface water underground through the artificial recharging of the Windhoek aquifer. As the recharge water will be injected directly into the aquifer without seeping through the unsaturated zone it was concluded that the injection water quality needs to conform at least to drinking water requirements.
Remote sensing and geologist should determine whether similar conditions prevail in other African countries for similar approaches to water conservation to cope with climate change. The participants/visitors of the FANRPAN workshop noticed the present use of fuel for the pumping system and the high cost for introducing alternative sources of energy for the artificial water refill installation (like solar and wind energy). Investments in such infrastructure are still searched for.