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<br />was also less at I~rrisburg; this was due to the effects of the routing <br /> <br /> <br />from Sunbury to Harrisburg as well as the effect of the large amount of <br /> <br /> <br />tributary flow which would have occurred in either case. <br /> <br />The Agnes flood peak that occurred at Sunbury was within inches of <br /> <br /> <br />the top of the levee at that location. The increase in flow that would <br /> <br /> <br />have occurred if the Wilkes-Barre levee had not been overtopped would <br /> <br />have undoubtedly brought about severe flooding at Sunbury and increased <br /> <br />the flooding at Harrisburg. It is difficult to determine whether the <br /> <br /> <br />inundation of Sunbury and the increased flooding at Harrisburg would <br /> <br /> <br />have caused more or less economic loss than what actually occurred at <br /> <br />Wilkes-Barre. Damage estimates for floods of this magnitude are subject <br /> <br /> <br />to much uncertainty as are the flows themselves. <br /> <br />SUMMARY <br /> <br />The Agnes flood in the Susquehanna River Basin above Harrisburg, PA, <br /> <br /> <br />was modeled for existing conditions and for the possible conditions of a <br /> <br /> <br />higher levee at Wilkes-Barre. The potential impact of a ficticious. high <br /> <br /> <br />levee which could contain the flow at Wilkes-Barre was analyzed in terms <br /> <br /> <br />of changes in downstream discharges. It was found through a comparison of <br /> <br /> <br />two sets of computed flows that the Agnes flood could have been about 7l,OOO <br /> <br />cfs larger at Sunbury and 58,000 cfs larger at Harrisburg if the Wilkes- <br /> <br /> <br />Barre levee had not been overtopped. The increased flow would have been <br /> <br /> <br />due to both a larger and earlier peak discharge at Wilkes-Barre that would <br /> <br /> <br />have coincided with the peak discharge from the West Branch at Sunbury. <br /> <br />REFERENCES <br /> <br />1. U. S. Army Corps of Engineers, "Hydrologic Study - Tropical Storm Agnes - <br />Report No.2," North Atlantic Division. October 1972. <br /> <br />2. U. S. Army Corps of Engineers, "HEC-l, Flood Hydrograph Package." <br />The Hydrologic Engineering Center, Davis, CA, January 1973. <br /> <br />7 <br />