Filling and Emptying System, John Day Lock Columbia River, Oregon and Washington; Hydraulic Model Investigation,
Abstract
The John Day lock chamber, culverts, and portions of adjacent approach channels were reproduced in a 1:25-scale model to test the original design and to develop required revisions. Vortexes over the original intake manifolds were eliminated by reversing the left intake. Pressures in the filling culverts were satisfactory. Turbulence inside the lock chamber was reduced by overhanging roofs to baffle jets from adjacent lateral culverts and by sloping the tops of ports. Probable cavitation in 90-degree bends downstream from emptying valves was avoided by moving the valves downstream from bends. The final design lock filled in 11.7 and emptied in 13.8 min (initial head 113 Ft). Typical maximum hawser forces on an eight-barge tow averaged 5.4 tons (filling) and 1.8 tons (emptying); transverse forces were 1.5 tons or less. A maximum instantaneous load of 62.5 tons and an instantaneous change of 22.0 tons were measured on the left filling valve lifting rod. Maximum load on the valve trunnions was 686 tons. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1974
- Accession Number
- ADA000329
Entities
People
- A. J. Chanda
- L. Z. Perkins