Lake Mcilwaine: The Eutrophication and Recovery of a by N. A. Burke, J. A. Thornton (auth.), Jeffrey A. Thornton, W.

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

'And God stated, allow there be a firmament in the course of the waters, and enable it divide the waters from the waters. ' Genesis 1:6 Lake McIlwaine is an artificial lake. It was once 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 favored leisure web site, the City's fundamental water offer reservoir (and the fourth biggest impoundment in Zimbabwe), a resource of irrigation water to downstream farms, a huge fishery, and, till the Nineteen Seventies, the receptacle of Salisbury's sewage effluent. it really is, briefly, ordinary of such a lot of 'urban' lakes in Africa and through the international. Lake McIlwaine can also be detailed, to my wisdom: being among the 1st of the key man-made lakes at the continent to be afflicted by what's often called cultural eutrophication, and the 1st to be r:ehabilitated to a mesotrophic country via a rational programme of lake administration. This quantity synthesizes this technique of eutrophication and restoration by way of the geology and geography (Chapter 2), physics (Chapter 3), chemistry (Chapter four) and biology (Chapter five) of the lake, and, while 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 used to be replaced to Harare on 18 April 1982. - Ed.

Show description

Read or Download Lake Mcilwaine: The Eutrophication and Recovery of a Tropical African Man-Made Lake PDF

Best african books

Gender and Development in the Middle East and North Africa: Women in the Public Sphere (Orientations in Development.)

A long time of funding and superior regulations have vastly elevated women's schooling and wellbeing and fitness and feature diminished their fertility fee. even if, the anticipated payoffs in larger employment and monetary development haven't materialized. due to cultural and political boundaries, just a 3rd of girls are within the exertions strength - the bottom expense on the earth.

The Afar volcanic province within the East African rift system

The seismically and volcanically energetic East African Rift method is a perfect laboratory for continental break-up tactics: it encompasses all levels of rift improvement. Its northernmost sectors in the Afar volcanic province contain failed rifts, nascent sea-floor spreading, and younger passive continental margins linked to a number of mantle plumes.

South America, Central America and Africa. South America, Central America and Africa

Topographic mapping performs a uncomplicated and significant position in the large box of cartography. lately, this kind of mapping has turn into a little missed and on hand literature is generally limited to information about the programmes of person international locations usually provided within the kind of monographs.

Imagining the Congo: The International Relations of Identity

Realizing the present civil conflict within the Congo calls for an exam of the way the Congo's id has been imagined through the years. Imagining the Congo historicizes and contextualizes the structures of the Congo's id in an effort to research the political implications of that id, having a look intimately at 4 historic sessions within which the id of the Congo was once contested, with various forces trying to produce and fasten meanings to its territory and folks.

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

Example text

9). The very significant decline in lake level during 1968 had major ecological effects, 38 200 150 ,. 1958-59 I I I J.. 3 100 0 --' u... ---'- ........ ~ ~ --' u... 1 I .... , ~ ::x:: I- z 0 ::E 50 «--' I0 I- 0 30 20 1978-79 10 JFMA M J J A S Fig. 8 Seasonal variation in riverine inflows and outflows during 1958-59, 1968-69 and 1978-79. 39 0" O~ C> a.. ::J o o~--~--~--~------~ 1;55 Fig . 9 1960 1965 1970 1975 1980 Variation in total annual inflow and outflow of Lake McIlwaine between 1954 and 1979.

3 100 0 --' u... ---'- ........ ~ ~ --' u... 1 I .... , ~ ::x:: I- z 0 ::E 50 «--' I0 I- 0 30 20 1978-79 10 JFMA M J J A S Fig. 8 Seasonal variation in riverine inflows and outflows during 1958-59, 1968-69 and 1978-79. 39 0" O~ C> a.. ::J o o~--~--~--~------~ 1;55 Fig . 9 1960 1965 1970 1975 1980 Variation in total annual inflow and outflow of Lake McIlwaine between 1954 and 1979. particularly on the water chemistry and benthic fauna of the lake (Marshall and Falconer, 1973; Marshall, 1978). Similar effects probably occurred again in 1973.

Concentrations are in mg I-I except where noted lake became eutrophied, although the ranges in concentration remain fairly large. 04 mg I-I since 1976. This is a reduction of over 70% in terms of phosphorus concentration, and of90% in terms of ammonia concentration (Figs. 5 and 6). Similar reductions in phosphorus concentrations have been observed in the Makabusi and Marimba Rivers. 7 mg P I-I. Nitrate concentrations, unlike most other trophic state indicators in Table 2, have continued to increase following the diversion of wastewater nutrients to pasture irrigation schemes (Fig.

Download PDF sample

Rated 4.83 of 5 – based on 47 votes