Distribution of ABR in the Turtle Creek subdivisions. The correct application of FFG requires that rainfall be uniformly distributed across the watershed. The forecaster can help satisfy this FFG factor by examining ABR in progressively smaller watersheds. Severely flooded subdivisions of the Turtle Creek watershed. The numbers in parentheses are the ABR for each watershed.
Dots show rain gage locations.
These basins are in the highly urbanized eastern suburbs of Pittsburgh. However, this was a convective event, resulting in a wide variation of rainfall amounts across the Aber's Creek basin. ABR distribution in the subdivisions of Aber's Creek for 2200 UTC 1 July until 0000 UTC 2 July. Figure 5 illustrates the observed ABR for the tributaries of Aber's Creek. A wide variation of ABR is shown across the Aber's Creek basin.