Ecological principles for management techniques in deeper reservoirs

Eutrophic reservoirs produce many management problems for both water supply and recreational management, which are only expensively solved. A range of eco-technical methods have been used over the past 10 years to control pho sphorus and nuisance algal bloom levels. Three case studies are used to sho w that these methods may be succesful but, if used without careful monoitor ing or controls, or if not applied in combination with each other or with o ther techniques, their practical value and benefit-cost ratio may not be ap parent.