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A limnological survey over 12 months was made of Western Springs, a small urban lake which has had an explosive growth of macrophytes in recent years. Seasonal data given for the lake include physical, chemical and biological factors. These are presented in an attempt to elucidate the reasons for the very high primary productivity exhibited by this ecosystem.

A concept of aquatic macrophyte management that integrates the positive and negative aspects of vegetation in lakes and rivers is discussed. This integrated approach involves three factors: macrophyte control, macrophyte enhancement, and identification and resolution of the conflicts created by multiple use of a waterbody. The primary decision in macrophyte management programmes must be whether to optimise for singlepurpose or for multipurpose use of the waterbody. Both technical (macrophyte control and enhancement) and social (conflict resolution) procedures are required to solve problems associated with the macrophyte status of multipurpose waterbodies.

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