Discharge ratings for control gates at Mississippi River lock and dam 21, Quincy, Illinois
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Abstract
The water levels of the navigation pools on the Mississippi River are maintained by the operation of tainter and roller gates at the locks and dams. Discharge ratings for the gates on Lock and Dam 21, at Quincy, Illinois, were developed from current meter discharge measurements made in the forebays of the gate structures. Methodology is given to compute the gate openings of the tainter gates accurately. Discharge coefficients , in equations that express discharge as a function of tailwater head, forebay head, and height of gate opening, were determined for conditions of submerged orifice and free weir flow. A comparison of the rating discharges to the hydraulic model rating discharges is given for submerged orifice flow for the tainter and roller gates.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Discharge ratings for control gates at Mississippi River lock and dam 21, Quincy, Illinois |
| Series title | Water-Resources Investigations Report |
| Series number | 87-4155 |
| DOI | 10.3133/wri874155 |
| Year Published | 1987 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Iowa City |
| Contributing office(s) | Iowa Water Science Center |
| Description | viii, 44 p.: ill.; 28 cm. |
| Country | United States |
| State | Illinois |
| City | Quincy |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |