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If the lock were empty, the boat would have had to wait 5 to 10 minutes while the lock was filled. For a boat travelling upstream, the process is reversed; the boat enters the empty lock, and then the chamber is filled by opening a valve that allows water to enter the chamber from the upper level.
The 1828 design originally filled the lock chamber through the use of culverts in the lock masonry. The wicket, i.e. large paddle valve, hidden in the masonry recess where the upper gate fit in, would be opened, and water would flow through the lock masonry to three openings in the lock chamber.
In this way, the operator can see exactly what state the locks and water valves are in. Mechanical interlocks are built into the controls to make sure that no component can be moved while another is in an incorrect state—for example, opening the drain and filling the valves of a lock chamber simultaneously. [8] [6]
The lower gates (B) and the draining valve (D) are closed. The vessel is assisted by the lockwall attendants who assure it is tied down and ready for the chamber to be drained. [2]: 2 Next, the upper gates (A) and the filling valve (C) are closed and the draining valve (D) is opened allowing water to drain via gravity out to Puget Sound.
The program's purpose was to replace the system of outdated wicket dams and small locks. The new dams were non-navigable and made of concrete and steel. Each dam has two adjoining locks, one 600-foot by 110-foot chamber, and a 1,200-foot by 110-foot chamber to accommodate fifteen barges that can lock through in one maneuver. [2]
1: Tube connecting the chamber to the high water side of the sluice 2: Gates to regulate the water level in the chamber. Only one gate may be opened at a time 3: Tube connecting the chamber to the low water side of the sluice 4: The chamber in which the water level can be controlled 5: Door with larger surface 6: Door with smaller surface.
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Stoplogs of a hydro power plant which can close the water flow to the turbine. Stoplogs are modular in nature, giving the operator of a gated structure the ability to control the water level in a channel by adding or removing individual stoplogs. A gate may make use of one or more logs.
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