Water is essential to life. Without it, neither man himself nor the animals, fish and plants upon which he depends for food could survive. A man must drink 5 to 6 pints of water every day. More than 70 per cent of the human body's weight is made up of water and unless the daily losses from this supply are replenished, the body cannot continue to function.

Chiefly tables.

"The controversy over the respective roles of phosphorus, nitrogen and carbon as critical elements in limiting the eutrophication process has recently been renewed. All three of these elements, plus many others, are essential and must be readily available to produce extreme algal growth"--Introd.

"It is now generally accepted that traditional empirical solutions to flood, drought, and storage problems are inadequate. On the other hand, analytical methods of solution are often intractable and therefore cannot be used in real-life problems. A third solution, data generation or simulation, offers a computationally easy and highly efficient alternative. This report summarizes the background to simulation and shows some of the many methods of generating data now available"--Abstract.