It is imperative that a serious consideration be given to:
- new health problems or vector patterns that may arise due to changes in water velocities, temperature, quality
or other physical change factors caused by water -impoundment;
- adequate public health planning to create facilities for migrant construction - workers and immigrant influx.
Possibility of disease aggravation or new public health problems introduced due to changes in population
density and distribution also need to be looked into. Measures to control contamination of surface and ground
water due to pesticides and fertilizers need also to be drawn up in advance,