Exploring for water can be as expensive as exploring for oil, a factor which is likely to become increasingly clear. Basic essentials of any water-supply study require an understanding and knowledge of the limiting conditions of quality, quantity, cost, and reliability. A logical 10-step program is outlined. The initial steps are as follows: (1) analyze the acutal water demand for flood requirements; (2) select the logical and apparent sources of supply; (3) collect and assess all availabe pertinent information; and (4) formulate a plan of analysis and attack for the study. The intermediate steps are as follows: (5) use this plan in making field and office investigations: (6) having determined the alternatives and preliminary costs, prepare a written assessment; and (7) using the brain-storming technique within the company or unit, utilize the assessment to devise a master action plan and budget for anticipated expenditures. The final steps are as follows: (8) complete other required investigations based upon the master plan and budget; (9) prepare detailed design, specifications and estimates; and (10) call tenders or negotiate the most favorable arrangements with respect to construction time and price.