Regression equations were developed for estimating flood flows at selected recurrence intervals for ungaged streams in Pennsylvania with drainage areas less than 2,000 square miles. These equations were developed utilizing peak-flow data from 322 streamflow-gaging stations within Pennsylvania and surrounding states. All stations used in the development of the equations had 10 or more years of record and included active and discontinued continuous-record as well as crest-stage partial-record stations. The state was divided into four regions, and regional regression equations were developed to estimate the 2-, 5-, 10-, 50-, 100-, and 500-year recurrence-interval flood flows. The equations were developed by means of a regression analysis that utilized basin characteristics and flow data associated with the stations.
Significant explanatory variables at the 95-percent confidence level for one or more regression equations included the following basin characteristics: drainage area; mean basin elevation; and the percentages of carbonate bedrock, urban area, and storage within a basin. The regression equations can be used to predict the magnitude of flood flows for specified recurrence intervals for most streams in the state; however, they are not valid for streams with drainage areas generally greater than 2,000 square miles or with substantial regulation, diversion, or mining activity within the basin.
publication date
This dataset is to be used with Geographic Information System (GIS) software or image processing software, e .g., ENVI or ERDAS
215 Limekiln Road
Attributes are considered accuarate within the scope of raster data format.
Data are consistent with raster type datasets.
Dataset is complete for the study area.
The dataset is accurate +/- 167 ft (50.8 m).
n/a
Used in original compilation (1995) Vern Svatos University of Delaware, Institute for Public Administration, Water Resources Agency (primary contact)
Used in original compilation (1995) Gregg Countryman, U.S. Geological Survey, Towson, Maryland (primary contact)
Used in original compilation (1995) Andrew Cohen, U.S. Geological Survey, Albany, New York (primary contact)
Used in original compilation (1995) Mike Gagnon, Pennsylvania Department of Environmental Resources, Harrisburg, PA (primary contact)
Used in original compilation (1995) Craig Neidig, WV GIS Coordinator (primary contact)
Used to update drainage into Pennsylvania (1996).
Compiled 1995 dataset using DE, MD, NY, PA, VA, and WV digital state geology data for the Chesapeake Bay drainage area.
Used in original compilation (1995) Karl Huber, Virginia Soil and Water Conservation, Richmond, Virginia (primary contact)
Used in original compilation (1995) Karl Huber, Virginia Soil and Water Conservation, Richmond, Virginia (primary contact)
New York State Museum / New York State Geological Survey
West Virginia DEP, TAGIS Unit
Original dataset developed for internal use in 1995 for the Chesapeake Bay. State digital geologic data mapjoined with border inconsistences resolved then clipped by the drainage basin outline for the Chesapeake Bay.
Original generalized geology interpretation (1995). For DE, MD, NY, PA, WV, Dennis Risser (Hydrologist, USGS, PA); for PA, Curtis Schreffler (Engineer, USGS, PA); for NJ, Ron Pristas and Don Monteverde (New Jersey Geological Survey); for NY, Dan Cadwell (New York Geological Survey); for PA, Tina Dodge (Pennsylvania Topographic and Geologic Survey)
Attribute added to polygon table. General geology types: Carbonate, Crystalline, Siliciclastic, Unconsolidated, H2o, Water
In 1996, for internal use, the dataset was reshaped to show drainage into the state of Pennsylvania for a project to conduct bridge-scour analysis in Pennsylvania.
In 2003, dataset was updated with digital geologic data from NY, and WV.
Metadata created August 2009.
Dataset copied.
Internal feature number.
ESRI
value = 1 is a carbonate cell; value = 0 is a non-carbonate cell
total number of cells have a VALUE of 0 or 1
ESRI
Although these data have been used by the U.S. Geological Survey (USGS), no warranty, expressed or
implied, is made by the USGS as to the accuracy and validity of the data nor shall the fact of distribution
constitute any such warranty, and no responsibility is assumed by the USGS in connection herewith.
Data distribution agreement for the New Jersey Department of Environmetal Protection (1996): This (map/publication/report) was developed using New Jersey Department of Environemtal Protection Geographic Information System digital data, but this secondary product has not been verified by NJDEP and is not state-authorized.
Data distribution liability for Statewide Bedrock Geology (NY, 1999): While every effort has been made to insure the integrity of this digital data, the New York State Education Department ("NYSED") makes no representation or warranty, expressed or implied, with respect to its accuracy, completeness, or usefulness for any particular purpose or scale. NYSED assumes no liability for damages resulting from the use of any information, apparatus, method or process disclosed in this dataset, map or text, and urges independent site-specific verification of the information contained herein. Any use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by NYSED.
Data distibution liability for the Geologic Map of Maryland: The 1968 Geologic Map of Maryland is outdated. Due to the age of this map, it may not represent an accurate interpretation of currently accepted geologic theory. Because the projection of the original map was distorted during reproduction, and the paper medium is not stable, the dataset does not meet any cartographic standards. Therefore, geographic or Cartesian coordinates cannot be applied to these images, and georeferencing is not possible.
215 Limekiln Road