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Navigation Conditions at Markland Locks and Dam, Ohio River: Hydraulic Model Investigation
The model investigation of Markland Locks and Dam, proposed to replace five existing low-lift locks and dams on the Ohio River, was concerned with a study of navigation conditions in the lock approaches under various flow conditions as affected by methods of operation of the dam gates, discharges from the powerhouse, and flows from the Stevens Creek diversion channel, including the development of measures to correct conditions found undesirable for navigation. The model study also afforded a means by which navigation interests could satisfy themselves, through observing the model in operation, as to the acceptability of the proposed design from a navigation standpoint. The model was built to the undistorted linear scale of 1:120 and reproduced approximately 3 miles of the Ohio River, the locks and dam structures, powerhouse facilities, and the outlet channel of the proposed Stevens Creek diversion. The model tests indicated that navigation conditions in the upper approach can be improved by straightening the alignment of the left bank upstream of the dam and by dredging the right bank to reduce velocities in the upper approach. Additional ports will be required in the upper guard wall to reduce currents sweeping around the end of the wall. The top elevation of ports should be lowered to prevent tows from being drawn against the wall. 'The number of gate bays in the dam can be reduced from 13 to 12 without adversely affecting navigation. Any undesirable conditions in the lower approach resulting from operation of the powerhouse during low flows can be eliminated by operation of selected dam gates. The length of the Stevens Creek diversion channel can be reduced materially without affecting navigation.
Navigation Conditions at Markland Locks and Dam, Ohio River: Hydraulic Model Investigation
The model investigation of Markland Locks and Dam, proposed to replace five existing low-lift locks and dams on the Ohio River, was concerned with a study of navigation conditions in the lock approaches under various flow conditions as affected by methods of operation of the dam gates, discharges from the powerhouse, and flows from the Stevens Creek diversion channel, including the development of measures to correct conditions found undesirable for navigation. The model study also afforded a means by which navigation interests could satisfy themselves, through observing the model in operation, as to the acceptability of the proposed design from a navigation standpoint. The model was built to the undistorted linear scale of 1:120 and reproduced approximately 3 miles of the Ohio River, the locks and dam structures, powerhouse facilities, and the outlet channel of the proposed Stevens Creek diversion. The model tests indicated that navigation conditions in the upper approach can be improved by straightening the alignment of the left bank upstream of the dam and by dredging the right bank to reduce velocities in the upper approach. Additional ports will be required in the upper guard wall to reduce currents sweeping around the end of the wall. The top elevation of ports should be lowered to prevent tows from being drawn against the wall. 'The number of gate bays in the dam can be reduced from 13 to 12 without adversely affecting navigation. Any undesirable conditions in the lower approach resulting from operation of the powerhouse during low flows can be eliminated by operation of selected dam gates. The length of the Stevens Creek diversion channel can be reduced materially without affecting navigation.
Navigation Conditions at Markland Locks and Dam, Ohio River: Hydraulic Model Investigation
1957
90 pages
Report
No indication
English
Navigation conditions at Markland Locks and Dam Ohio River
Engineering Index Backfile | 1957