|Location||Botswana, South East|
|Central coordinates||25o 57.60' East 24o 37.20' South|
|Year of IBA assessment||2001|
Site description Four large sewage-treatment lagoons, operational since late 1990, surrounded by grassland and Acacia-dominated savanna, c.15km north of Gaborone, close to the dormitory village of Phakalane. The lagoons are roughly rectangular (totalling 70ha of water), generally steep-sided, and edged by high bunds. There are some exposed muddy edges, small areas of sand and gravel, several very small islands and remnants of dead and dying trees in one lagoon. There is marginal vegetation of Typha, Phragmites and scattered small trees and bushes.The site lies adjacent to the Ngotwane river, a small tributary of the Limpopo, into which the final effluent discharges. Riparian vegetation along this section of the Ngotwane is dominated by Combretum and there are some open areas of wet grassland and Juncus. Upriver in and south of Gaborone (outside the IBA) there are a series of artificial wetlands along the Ngotwane river. These are interlinked in that all are used by waterfowl which frequently move from one dam or sewage pond to another. These wetlands include Mogobane Dam, Ngotwane Dam, the large Gaborone Dam completed in 1964/65 and covering 19km, various sewage ponds in Gaborone, notably Ngotwane, Maru-a-Pula and Tsholofelo, and associated wetlands such as the Typha swamp in Gaborone Game Reserve. Although all these at times hold a diversity of waterfowl, none support large numbers nor any species in numbers that exceed the 0.5% threshold. Phakalane sewage ponds are undoubtedly the most important in this chain of wetlands.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Maccoa Duck Oxyura maccoa||winter||1993-1995||100-440 individuals||good||A4i||Near Threatened|
|Southern Pochard Netta erythrophthalma||winter||1993-1995||605 individuals||good||A4i||Least Concern|
|Land-use||Extent (% of site)|
Other biodiversity None known to BirdLife International.
References Bishop (1994), Bishop (1995), Bishop and Tyler (1998), Tyler (2001).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Phakalane sewage lagoons, near Gaborone. Downloaded from http://www.birdlife.org on 19/12/2013
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