The design of any urban system is governed by the consideration of the least capital expenditure for the most effective service. To this end, the designer must carefully estimate the present and future demands of the system. For a sewerage system, these demands depend upon the number of residences and commercial and industrial customers which it must serve throughout its life. Therefore, within the Study Area, a compilation was made of the area and location of existing residential, commercial, industrial, and public land uses. This compilation was the basis for projecting land use throughout the design period.
Various conditions influenced the estimation of wastewater flows including water supply, pattern of water use, plumbing and sewerage facilities, and other criteria. However, the actual coverage of land by residences factories, and shops was the basis upon which the other criteria were applied.