Case Studies
Mar 7, 2016

Reanalysis of Flood of Record Using HEC-2, HEC-RAS, and USGS Gauge Data

Publication: Journal of Hydrologic Engineering
Volume 21, Issue 6

Abstract

Three independent analyses establish that the Conestoga River flow published by the U.S. Geological Survey (USGS) for Tropical Storm Agnes in 1972 of 1,420m3/s (50,300  ft3/s) should have been at least 1,660m3/s (58,600ft3/s), an increase of over 16%. The three analyses included an empirical analysis of the data for U.S. Geological Survey Gauge 01576500, a reanalysis of a 1978 U.S. Army Corp of Engineers Hydrologic Engineering Center (HEC)-2 simulation of the Conestoga River, and a retrofit and minor corrections to a preliminary 2013 HEC-RAS (river analysis system) simulation of the Conestoga River.

Get full access to this article

View all available purchase options and get full access to this article.

Acknowledgments

The author acknowledges Annette Lockwood for her dedicated editing and his wife Suzanne and son Rory for their support during this project. The author greatly appreciates the time and expertise of the reviewers, especially the annotated manuscript provided by Reviewer 3. The author also wishes to thank colleagues at Rettew Associates, Incorporated who reviewed an early version of this paper.

References

Benson, M. A., and Dalrymple, T. (1967). “General field and office procedures for indirect discharge measurements.” U.S. Geological Survey Techniques of Water-Resources Investigations, U.S. Geological Survey, Washington, DC.
Boswell Yule Jordan Engineering. (1989). “Hydrologic and Hydraulic Report for Relocating PA Route 23 over Conestoga River and an Unnamed Tributary to Conestoga River, Lancaster County.” S.R. 6023 (L.R. 1124), Section B01, Pennsylvania Dept. of Transportation, Camp Hill, PA.
Cohn, T. A., Lane, W. L., and Baier, W. G. (1997). “An algorithm for computing moments-based quantile estimates when historical flood information is available.” Water Resour. Res., 33(9), 2089–2096.
Dalrymple, T. (1960). “Flood-frequency analyses, manual of hydrology: Part 3. Flood flow techniques.”, Washington, DC.
FEMA. (1980). “Flood insurance study, Township of East Lampeter, Lancaster County, Pennsylvania.” Washington, DC.
FEMA. (2002). “Floodplain modeling manual, HEC-RAS procedures for HEC-2 modelers.” Washington, DC.
FEMA. (2013). “Flood insurance study, Lancaster County, Pennsylvania, all jurisdictions.” Washington, DC.
FEMA. (2015). “Lower Susquehanna watershed map.” 〈http://www.riskmap3.com/sites/default/files/lower_susquehanna_watershed_map.pdf〉 (Dec. 13, 2015).
PeakFQ version 7.1 [Computer software]. U.S. Geological Survey, Reston, VA.
Rantz, S. E., et al. (1982). “Measurement and computation of streamflow.” Computation of discharge, Vol. 2, U.S. Geological Survey, Washington, DC, 330–331.
U.S. Army Corps of Engineers. (1991). “HEC-2 water surface profiles.” Hydrologic Engineering Center, Davis, CA.
U.S. Army Corps of Engineers. (2010a). “HEC-RAS river analysis system.” Hydraulic reference manual, version 4.1, Hydrologic Engineering Center, Davis, CA.
U.S. Army Corps of Engineers. (2010b). “HEC-RAS river analysis system.” User’s manual, version 4.1, Hydrologic Engineering Center, Davis, CA.
U.S. DOT. (1961). “Design charts for open channel flow.” Washington, DC.
USGS. (2015b). “USGS 01576500 Conestoga River at Lancaster, PA.” 〈http://waterdata.usgs.gov/pa/nwis/uv/?site_no=01576500&PARAmemter_cd=00065,00060,00010〉.
USGS and NOAA (National Oceanic and Atmospheric Administration). (1975). “Hurricane Agnes Rainfall and Floods, June–July 1972.” Washington, DC.
Weaver, A. (2016a). “Auxiliary file 1 for reanalysis of flood of record using HEC-2, FEC-RAS, and USGS gauge data. figshare.” 〈https://doi.org/10.6084/m9.figshare.2060448.v1〉 (Jan. 4, 2016).
Weaver, A. (2016b). “Auxiliary file 2 for reanalysis of flood of record using HEC-2, FEC-RAS, and USGS gauge data. figshare.” 〈https://doi.org/10.6084/m9.figshare.2060439.v1〉 (Jan. 4, 2016).
Weaver, A. (2016c). “Auxiliary file 3 for reanalysis of flood of record using HEC-2, FEC-RAS, and USGS gauge data. figshare.” 〈https://doi.org/10.6084/m9.figshare.2060451.v1〉 (Jan. 4, 2016).
Weston, R. F. (1978). “Final floodway upper Conestoga Creek.” Federal Emergency Management Agency, Engineering Library, Alexandria, VA.

Information & Authors

Information

Published In

Go to Journal of Hydrologic Engineering
Journal of Hydrologic Engineering
Volume 21Issue 6June 2016

History

Received: Mar 27, 2015
Accepted: Dec 1, 2015
Published online: Mar 7, 2016
Published in print: Jun 1, 2016
Discussion open until: Aug 7, 2016

Permissions

Request permissions for this article.

Authors

Affiliations

Andrew C. Weaver, M.ASCE [email protected]
P.E.
President, Envalue Engineering, 3100 Parker Dr., Lancaster, PA 17601. E-mail: [email protected]; [email protected]

Metrics & Citations

Metrics

Citations

Download citation

If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.

Cited by

View Options

Get Access

Access content

Please select your options to get access

Log in/Register Log in via your institution (Shibboleth)
ASCE Members: Please log in to see member pricing

Purchase

Save for later Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.

Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
ASCE Library Card (5 downloads)
$105.00
Add to cart
ASCE Library Card (20 downloads)
$280.00
Add to cart
Buy Single Article
$35.00
Add to cart

Get Access

Access content

Please select your options to get access

Log in/Register Log in via your institution (Shibboleth)
ASCE Members: Please log in to see member pricing

Purchase

Save for later Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.

Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
ASCE Library Card (5 downloads)
$105.00
Add to cart
ASCE Library Card (20 downloads)
$280.00
Add to cart
Buy Single Article
$35.00
Add to cart

Media

Figures

Other

Tables

Share

Share

Copy the content Link

Share with email

Email a colleague

Share