Scientific Investigations Report 2009–5186
AbstractThe Illinois Department of Natural Resources–Office of Water Resources operates control structures on a reach of the Fox River in northeastern Illinois between McHenry and Algonquin. The structures maintain water levels in the river for flood-control and recreational purposes. This report documents flow ratings for hinged-crest gates, a broad-crested weir, sluice gates, and an ogee spillway on the control structures at McHenry and Algonquin. The ratings were determined by measuring headwater and tailwater stage along with streamflow at a wide range of flows at different gate openings. Standard control-structure rating techniques were used to rate each control structure. The control structures at McHenry consist of a 221-feet(ft)-long broad-crested weir, a 4-ft-wide fish ladder, a 50-ft-wide hinged-crest gate, five 13.75-ft-wide sluice gates, and a navigational lock. Sixty measurements were used to rate the McHenry structures. The control structures at Algonquin consist of a 242-ft-long ogee spillway and a 50-ft-wide hinged-crest gate. Forty-one measurements were used to rate the Algonquin control structures. |
First Posted January 2010 For additional information contact: Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
Straub, T.D., Johnson, G.P., Hortness, J.E., and Parker, J.R., 2009, Control-structure ratings on the Fox River at McHenry and Algonquin, Illinois: U.S. Geological Survey Scientific Investigations Report 2009–5186, 61. p
Abstract
Introduction
Purpose and Scope
Streanflow During Study Period
Approach
Previous Studies
McHenry Control-Structure Ratings
Broad-Crested Weir
Hinged-Crest Gate
Sluice Gates
Example Calculations
Algonquin Control-Structure Ratings
Ogee Spillway with Hinged-Crest Gate Closed (with and without flow over gate)
Ogee Spillway and Hinged-Crest Gate Open
Example Calculations
Summary
Acknowledgments
References Cited
Appendixes