Riassunto
Si considerano gli effetti ecologici che potranno derivare al bilancio idrico del L. Trasimeno (Umbria, Italia) e alle comunità stagnicole in seguito alla immissione di acque di tributari artificiali.
Summary
The water level of Lake Trasimeno (Umbria — Italy) has dropped as a result of several years of low rainfall and a canal cut in 1898. Recently three streams have been diverted into the lake. The influence of these on the water-level is forecast and the possible effect on the swamp communities discussed.