By N. A. Burke, J. A. Thornton (auth.), Jeffrey A. Thornton, W. K. Nduku (eds.)

'And God acknowledged, enable there be a firmament in the course of the waters, and allow it divide the waters from the waters. ' Genesis 1:6 Lake McIlwaine is an artificial lake. It used to be shaped in 1952 through the Hunyani­ poort Dam and is located at the Hunyani River a few 37 km southwest of Salisbury* within the Republic of Zimbabwe**. it's a lake of many facets: being a well-liked leisure website, the City's fundamental water provide reservoir (and the fourth greatest impoundment in Zimbabwe), a resource of irrigation water to downstream farms, a massive fishery, and, until eventually the Nineteen Seventies, the receptacle of Salisbury's sewage effluent. it really is, briefly, regular of such a lot of 'urban' lakes in Africa and in the course of the global. Lake McIlwaine is usually special, to my wisdom: being among the 1st of the main man-made lakes at the continent to be afflicted by what's referred to as cultural eutrophication, and the 1st to be r:ehabilitated to a mesotrophic country via a rational programme of lake administration. This quantity synthesizes this means of eutrophication and restoration when it comes to the geology and geography (Chapter 2), physics (Chapter 3), chemistry (Chapter four) and biology (Chapter five) of the lake, and, when dialogue of the trophic relationships among those parts is past the scope of this monograph, discusses its utilisation, conservation and administration (Chapter 6). * next to writing, the identify of the Zimbabwean capital was once replaced to Harare on 18 April 1982. - Ed.

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Lake Mcilwaine: The Eutrophication and Recovery of a Tropical African Man-Made Lake

'And God acknowledged, enable there be a firmament in the middle of the waters, and enable it divide the waters from the waters. ' Genesis 1:6 Lake McIlwaine is an artificial lake. It used to be shaped in 1952 by means of the Hunyani­ poort Dam and is positioned at the Hunyani River a few 37 km southwest of Salisbury* within the Republic of Zimbabwe**.

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Extra resources for Lake Mcilwaine: The Eutrophication and Recovery of a Tropical African Man-Made Lake

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R. B. Ward, this volume, and below), with the Hunyani River contributing 37 r- 100 o ~ r- E E 98 m < ~ 2000 c: o 962. g; w QJ 6:: 1200 "c: o ~ 800 'o p 0. --~ 1958 1968 1978 Fig . 7 Total annual evaporation (e) and precipitation (p) in mm at Lake McIlwaine between 1958 and 1978, and mean annual lake level (I) variations over the same period. upwards of 80% of the total gauged inflow, with the Makabusi and Marimba Rivers accounting for the remainder. Ungauged flows amount to about 25% of the total gauged flow and approximately 15% of the total annual inflow volume.

Under prevailing wind conditions, wave heights increase from east to west across the lake. 5 hours (for Lake McIIwaine) from the commencement of the strong wind the waves become in equilibrium with the wind and a fully arisen sea is said to exist. Under this condition the significant wave height and significant wave period at the downwind shore of the lake may be predicted by the 5MB (Sverdrup-MunkBretschneider) method (US Army Corps of Engineers, 1973). With a fetch of 5 km and a maximum sustained wind strength of 9 m S-I, the 5MB method gives the following results: a significant wave period of2.

Most inorganic ions follow similar seasonal trends, with maximum values being recorded in spring and summer, and minimum in winter. This pattern is closely related to the hydrological regime (see B. R. Ballinger andJ. A. Thornton, this volume) and reflects concentration by evaporation during the hot spring and summer months as well as dilution by riverine inflows during late summer and winter. Figures 7, 8 and 9 show the seasonal distribution of conductivity, pH and alkalinity, respectively, in the surface waters at the mid-lake station during 1969 and 1979.

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