The researchers comparing peak flows from design storms and historical storms used different catchments and different simulation programs. A comparison of the peak flow frequency results for the Chicago design storm is presented first in this chapter. The results for this storm are summarized in Table 3.

TABLE 3 SUMMARY OF RESULTS FROM PERVIOUS STUDIES (AVERAGE PERCENTAGE DIFFERENCE BETWEEN THE CHICAGO DESIGN STORM AND HISTORICAL STORM FLOWS)

Study Catchment Chicago Design Storm
Arnell (1980) Bergsjon
Linkoping 1
Linkoping 2
-2.2%
Marsalek (1979) Burlington
(area 26 ha, imp. 30%)
80.0%
Watson (1980) Pinetown
Kew
2.0%
-5.0%

A study conducted in the IMPSWM program is also presented here. The methodology used to compare the Chicago and SCS 24-hr design storms with the historical storms is given in the second section of the chapter.

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