Stream profile analysis using a step backwater model for selected reaches in the Chippewa Creek basin in Medina, Wayne, and Summit Counties, Ohio

Straub, David E.; Ebner, Andrew D.

Abstract:

The USGS, in cooperation with the Chippewa Subdistrict of the Muskingum Watershed Conservancy District, performed hydrologic and hydraulic analyses for selected reaches of three streams in Medina, Wayne, Stark, and Summit Counties in northeast Ohio: Chippewa Creek, Little Chippewa Creek, and River Styx. This study was done to facilitate assessment of various alternatives for mitigating flood hazards in the Chippewa Creek basin. StreamStats regional regression equations were used to estimate instantaneous peak discharges approximately corresponding to bankfull flows. Explanatory variables used in the regression equations were drainage area, main-channel slope, and storage area. Hydraulic models were developed to determine water-surface profiles along the three stream reaches studied for the bankfull discharges established in the hydrologic analyses. The HEC-RAS step-backwater hydraulic analysis model was used to determine water-surface profiles for the three streams. Starting water-surface elevations for all streams were established using normal depth computations in the HEC-RAS models. Cross-sectional elevation data, hydraulic-structure geometries, and roughness coefficients were collected in the field and (along with peak-discharge estimates) used as input for the models. Reach-averaged reductions in water-surface elevations ranged from 0.11 to 1.29 feet over the four roughness coefficient reduction scenarios.

Genre:

USGS Numbered Series

ProdID:

99178

Citation Author:

Straub, David E.; Ebner, Andrew D.

Citation Contributing Office:

Ohio Water Science Center

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Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

0411500

Citation LatS:

0404500

Citation LonE:

-0813500

Citation LonW:

-0820000

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Citation Phsyical Description:

vi, 12 p.; Appendices

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Citation Public Comments:

In cooperation with the Chippewa Subdistrict of the Muskingum Watershed Conservancy District

Citation Publisher:

U.S. Geological Survey

Citation Series:

Scientific Investigations Report

Citation Series Code:

SIR

Citation Series Number:

2011-5024

Citation Search Results Text:

Stream profile analysis using a step backwater model for selected reaches in the Chippewa Creek basin in Medina, Wayne, and Summit Counties, Ohio; 2011; SIR; 2011-5024; Straub, David E.; Ebner, Andrew D.