University of Illinois Urbana-Champaign

Embarras River watershed digital floodplain mapping, Champaign County, Illinois

McConkey, Sally A.

Permalink

https://hdl.handle.net/2142/94198

Description

Title
Embarras River watershed digital floodplain mapping, Champaign County, Illinois
Author(s)
McConkey, Sally A.
Issue Date
2002
Keyword(s)
Floodplain management
Geographic Coverage
  • Illinois
  • Champaign County, Illinois
  • Embarras River, Illinois
Abstract
The project objective was to assimilate the best available data to prepare digital maps of critical riparian corridors and areas at risk of flooding for the upper Embarras River, East Branch Embarras River, and Black Slough in Champaign County. Hydrologic, hydraulic, and digital data defining streams and floodplains were reconciled with digital orthophotos of the Embarras watershed. Using orthophotos as base maps, digital data sets were prepared of streams and rivers and floodplain boundaries expected for a flood having a one percent chance of occurrence in any given year. These maps were developed to provide easy-to-interpret information that identifies areas at risk during flood events. The maps were developed using ESRI ArcGIS 8.1 software and are on the attached CD-ROM in ready-to-print PDF format. The CD-ROM format is compatible with Microsoft Windows Operating System Version 95 or later. The CD-ROM contains the HEC-RAS hydraulic model used to simulate flood elevations, digital coverages used to compose the maps, digital photos of bridge crossings and landscapes of the watershed, and this report. Graphs of channel thalweg and water surface profiles showing the depth of flooding for the biennial flood event (2-year flood) and the one-percent annual chance of occurrence flood (100-year flood) provide additional information.
Publisher
Illinois State Water Survey
Series/Report Name or Number
ISWS Contract Report CR-2002-05
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/94198
Copyright and License Information
Copyright 2002 Board of Trustees University of Illinois.

Owning Collections

Contract Reports - Illinois State Water Survey PRIMARY
Report series published by the Illinois State Water Survey from 1953 - date (ISSN 0733-3927)