7.1 Methodology of Design Storms

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)

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.