Design engineers are often faced with the complex task of designing new collection systems. Methods based on Manning?s equation are frequently used due to the availability of tables and graphs which simplify the calculations. These methods lack accuracy except when laborious numerical method s are utilized. The design of a collection system seeks the computation of a diameter which produces an accepted velocity value without considering the water level in the computed pipe. Yet, the flow efficiency whether volumetric or circulation is an important design criteria. By considering the latter an increase in the volumetric capacity and circulation capacity of the flow in the pipe can be obtained. In this research, a new concept for the design of partially full pipe is proposed. It is based on Manning?s equation and produces more efficient flow in pipe, i.e., the pipe is as fully exploited as possible.
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