This report includes a Geographic Information System (GIS) tool to compute basin characteristics used in the regional regression equations included with the report. It is the responsibility of the user to use the tool properly and to verify that the results are meaningful. The user is cautioned that although the tool has been tested, future uses might reveal errors that were not detected during testing.

For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Thanks are also extended to all of the USGS hydrologists and hydrologic technicians who made extraordinary efforts during and after the floods in collecting and analyzing the data for this report. The authors would also like to acknowledge William F. Coon and Phillip J. Zarriello of the USGS for their detailed technical reviews of the report and Mary S. Ashman (USGS) for her thorough editorial review of the report. The major contributions to the graphics in the report by the geographic information system and publications units of the USGS New York Water Science Center are also much appreciated. 28-29, 2011, January 19-20, 1996, and April 4-5, 1987, and corresponding elevations for the 10-, 2-, 1-, and 0. Floods of 2011 in New YorkBy Richard Lumia, Gary D. Firda, and Travis L. Smith AbstractRecord rainfall combined with above-average temperatures and substantial spring snowmelt resulted in record flooding throughout New

Contents III12. Graphs showing peak discharge as a function of drainage area during the flood of January 19-20, 1996 at sites within the Catskill Mountain region: A.

No abstract

Precipitation, snowmelt, and resultant flooding throughout northern New York from December 28, 1984 through January 2, 1985, were investigated through a detailed analysis of 56 precipitation stations, 101 stage and (or) discharge gaging stations, and 9 miscellaneous measurement sites. Flood damage to property and roads and bridges exceeded $5 million. Lewis and Oswego Counties were declared Federal disaster areas, primarily a result of flooding of the Black River and Salmon River.Storm-precipitation and runoff maps show the storms' greatest intensity to have been over the Tug Hill and southwest Adirondack areas. Total rainfall from December 28 through January 2 was 6.90 inches at Stillwater Reservoir but only 0.69 inches at Lake Placid. New peak discharges of record occurred at 17 gaging stations throughout northern New York, and the maximum discharge at 17 sites had recurrence intervals equal to or greater than 100 years. Computed inflows to 11 major lakes and reservoirs in northern New York indicate that significant volumes of water (as much as 5 inches of storm runoff at Stillwater Reservoir) were stored during the stormrunoff period. Maximum 1-day flood volumes at two gaging stations on the Black River had recurrence intervals greater than 100 years.To help evaluate the extent of flooding, 67 floodmarks were obtained along a 94-mile reach of the Black River from Dexter to Forestport, and several floodmarks were surveyed within major communities along the Salmon River. The floodmarks were obtained primarily near major bridges and dams along these rivers.