ABSTRACT
This chapter describes some of the major ecological aspects to be considered in assessing and designing water projects such as hydroelectric dams and irrigation canals, to ensure their sustainability. Although major health impacts are caused by dams and reservoirs in the Tropics, general ecological effects are also important, just as they are in temperate climates. In the Tropics, the aquatic insects and snails which transmit tropical diseases are directly influenced by these general ecological changes, which thus also influence disease transmission.
