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Storm and Flood of July 5, 1989, in Northern New Castle County, Delaware Hi 18-22

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Storm and Flood of July 5, 1989, in Northern New Castle County, Delaware Hi 18-22 STORM AND FLOOD OF JULY 5,1989, IN NORTHERN NEW CASTLE COUNTY, DELAWARE By Gary N. Paulachok, Robert H. Simmons, and Anthony J. Tallman U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 94-4188 Dover, Delaware 1995 U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY Gordon P. Eaton, Director For additional information write to: Copies of this report can be purchased from: U.S. Geological Survey Hydrologist In-Charge, Delaware Office Earth Science Information Center U.S. Geological Survey Open-File Reports Section Federal Building, Room 1201 Box 25286, MS 517 300 S. New Street Denver Federal Center Dover, DE 19904 Denver, CO 80225 CONTENTS Glossary...........................................................................................................................................................vi Abstract.............................................................................................................................................................1 Introduction......................................................................................................................................................2 Purpose and scope....................................................................................................................................2 Location of study area..............................................................................................................................2 Acknowledgments...................................................................................................................................2 Description of storm.........................................................................................................................................4 Spatial distribution of rainfall..................................................................................................................4 Temporal distribution of rainfall..............................................................................................................4 Description of flood..........................................................................................................................................9 Peak stage and discharge at streamflow-gaging stations.........................................................................9 Peak stage at selected sites.....................................................................................................................21 Summary.........................................................................................................................................................26 Selected references.........................................................................................................................................29 FIGURES 1 -2. Maps showing location of: 1. Study area and study region ........................................................................................................3 2. Rain gages and distribution of rainfall, July 4-6, 1989...............................................................7 3. Graphs showing hourly and cumulative rainfall at the University Farm, Newark, Delaware, and the New Castle County Airport, New Castle, Delaware, July 4-6, 1989 ................................................................................................................................10 4 -9. Photographs showing: 4. White Clay Creek flooding at Stanton, Delaware, July 5, 1989................................................ 11 5. Submergence of concrete-arch bridge along old Route 7 by floodwaters of White Clay Creek at Stanton, Delaware..........................................................................................11 6. Damage to highway bridge and sidewalk from flooding of Shellpot Creek, Wilmington, Delaware.......................................................................................................... 12 7. Damage to highway and parking lot caused by flooding of Shellpot Creek, Wilmington, Delaware.......................................................................................................... 12 8. Floodwaters from Shellpot Creek at Market Street Shopping Center, Wilmington, Delaware.......................................................................................................... 13 9. Floodwaters from White Clay Creek at Stanton, Delaware...................................................... 13 10. Map showing location of stream stage and discharge measuring stations.......................................... 15 11-17. Hydrographs showing discharge at: 11. Shellpot Creek at Wilmington, Delaware, July 4-6, 1989.......................................................20 12. Brandywine Creek at Wilmington, Delaware, July 4-6, 1989.................................................20 13. Red Clay Creek at Wooddale, Delaware, July 4-6, 1989........................................................20 14. Red Clay Creek near Stanton, Delaware, July 4-6, 1989........................................................20 15. White Clay Creek near Newark, Delaware, July 4-6, 1989....................................................21 16. Christina River at Coochs Bridge, Delaware, July 4-6, 1989.................................................21 17. Christina River near Bear, Delaware, July 4-6, 1989..............................................................21 Storm and flood of July 5, 1989, in Northern New Castle County, Delaware Hi 18-22. Maps showing location of peak-stage survey sites on: 18. Shellpot Creek in Delaware.................................................................................................... 24 19. Red Clay Creek in Delaware................................................................................................... 25 20. White Clay Creek in Delaware...............................................................................................26 21. Christina River in Delaware.................................................................................................... 27 22. Little Mill Creek in Delaware.................................................................................................27 TABLES 1. Rainfall data for sites in the study region, July 4-6, 1989................................................................. 5 2. Hourly and cumulative rainfall at the Univeristy Farm, Newark Delaware, and the New Castle County Airport, New Castle, Delaware, July 4-6, 1989............................................ 8 3. Peak stages and discharges for previous flood of record and the flood of July 5,1989.................. 14 4-10. Selected values of stage and discharge for: 4. Station 01477800 Shellpot Creek at Wilmington, Delaware, July 4-6, 1989......................... 16 5. Station 01481500 Brandywine Creek at Wilmington, Delaware, July 4-6, 1989................... 17 6. Station 01480000 Red Clay Creek at Wooddale, Delaware, July 4-6, 1989........................... 17 7. Station 01480015 Red Clay Creek near Stanton, Delaware, July 4-6, 1989........................... 18 8. Station 01479000 White Clay Creek near Newark, Delaware, July 4-6, 1989....................... 18 9. Station 01478000 Christina River at Coochs Bridge, Delaware, July 4-6, 1989.................... 19 10. Station 01478040 Christina River near Bear, Delaware, July 4-6, 1989................................ 19 11 -15. Peak flood stage at selected sites on: 11. Shellpot Creek, Delaware, July 5,1989.................................................................................. 22 12. Red Clay Creek, Delaware, July 5, 1989 ................................................................................22 13. White Clay Creek, Delaware, July 5, 1989.............................................................................23 14. Christina River, Delaware, July 5, 1989 .................................................................................23 15. Little Mill Creek, Delaware, July 5,1989............................................................................... 24 iv Storm and flood of July 5,1989, in Northern New Castle County, Delaware CONVERSION FACTORS AND VERTICAL DATUM Multiply By To obtain inch (in.) 25.4 millimeter foot (ft) 0.3048 meter mile (mi) 1.609 kilometer square mile (mi2) 2.590 square kilometer inch per hour (in/hr) 25.4 millimeter per hour cubic foot per second (ft3/s) 0.02832 cubic meter per second cubic foot per second per square mile [(fr/s)/mr] 0.01093 cubic meter per second per square kilometer Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1 929 a geodetic datum derived from a general adjustment of the first-order level nets of the United States and Canada, formerly called Sea Level Datum of 1929. Storm and flood of July 5,1989, in Northern New Castle County, Delaware GLOSSARY Crest-stage station. A stream site where information is collected systematically only on peak stage and discharge. Cubic feet per second. A unit of measurement for water discharge. One cubic foot per second is equal to the discharge of a stream at a rectangular cross section 1 foot wide and 1 foot deep, flowing at an average velocity of 1 foot per second. Equivalent to 448.8 gallons per minute. Cubic feet per second per square mile. The average number of cubic feet of water flowing per second from each square mile of area drained, assuming that the runoff is distributed uniformly in time and area. Floodmark. A mark showing the highest level
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