Computerized Analysis of Rainfall Records to Determine Design Storm for CSO Abatement.
Design storms for control of discharges from storm or combined sewer systems are typically stated in terms of duration/recurrence-interval, e.g. the system must be designed for the 5-year 24-hour storm or the 1-year 6-hour storm. Selection of the design storm under these conditions normally means selecting it from standard curves or charts prepared by a government agency for the specific geographic area involved. When control requirements are stated in terms of allowable overflows or discharges, rather than in terms of containment or conveyance of a specific storm event, selection of the design storm or storms is not so easily determined. This chapter presents a methodology for selecting design storms to limit overflow from a combined sewer system to not more than a specified number of occurrences per year.
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