PDF files showing 10-year flood-plain boundaries superimposed on aerial photos were included with the report on a CD-ROM.
NOTE: Because of
the high resolution and large file size of the original images in this series,
only a reduced-resolution preview version of each image can be served online.
To obtain a CD-ROM of the high-resolution images, please contact Information
Officer, USGS, 6480 Doubletree Ave., Columbus, OH 43229-1111.
These files are available online:
Battenhouse Ditch (1.8 mb)
Beaver Creek (5.6 mb)
Brighton-Camden Ditch (170 kb)
Engle Ditch (205 kb)
Gable Ditch (2.2 mb)
Heider Ditch (2.2 mb)
Plum Creek (1.8 mb)
Ridgeway Ditch (2.3 mb)
Schroder Ditch (2 mb)
The following are shown in all these viewable files:
Hydrologic and hydraulic analyses were done for selected reaches of nine streams in Lorain County Ohio. To assess the alternatives for flood-damage mitigation, the Lorain County Engineer and the U.S. Geological Survey (USGS) initiated a cooperative study to investigate aspects of the hydrology and hydraulics of the nine streams. Historical streamflow data and regional regression equations were used to estimate instantaneous peak discharges for floods having recurrence intervals of 2, 5, 10, 25, 50, and 100 years. Explanatory variables used in the regression equations were drainage area, main-channel slope, and storage area. Drainage areas of the nine stream reaches studied ranged from 1.80 to 19.3 square miles.
The step-backwater model HEC-RAS was used to determine water-surface-elevation profiles for the 10-year-recurrence-interval (10-year) flood along a selected reach of each stream. The water-surface pro�file information was used then to generate digital mapping of flood-plain boundaries. The analyses indicate that at the 10-year flood elevation, road overflow results at numerous hydraulic structures along the nine streams.
Abstract
Introduction
Description of the study area
Purpose and scope
Acknowledgments
Study Methods
Data collection
Estimation of flood-peak discharges
Development of water-surface profiles
Delineation of flood-plain boundaries
Hydrologic Analyses
Hydrologic analyses for rural basins
Hydrologic analyses for urban basins
Flow apportionment analyses for Engle Ditch
Storage area analyses for Heider Ditch
Hydrologic analyses for Heider Ditch
Hydraulic Analyses
Analyses of open channels
Analyses of hydraulic structures
Results of hydraulic analyses
Base maps and flood-boundary delineation
Summary
References
Appendixes
This report is available online
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