Developing Criteria for Design Event Selection
Authors: Schultz, Nancy U.; Nelson, Richard E.
Source: Water Practice, Volume 1, Number 6, December 2007 , pp. 1-14(14)
Publisher: Water Environment Federation
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Abstract:
Design flows for separate sanitary sewers have evolved from steady-state, constant flows calculated from the number of connected fixtures connected to complex dynamic calculation based on storm conditions and expected, although often illicit, interconnections with the storm drainage system. This paper will examine the historical evolution of the theory behind defined design flow conditions through the selection of specific design storm conditions. Design criteria should consider both flow generation rates from customers and system leaks and the level of service to be afforded customers. To a great extent, the current frequency of SSOs being experienced by some systems is due to the use of past design criteria that did not adequately address flow generation rates or level of service. A recommended decision flow chart for selecting design storm conditions for sanitary sewer systems subject to rainfall derived infiltration inflow is presented.
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