Symbols representingthese valves provide awealth of information about the valve it represents. Symbols show the meth-ods of actuation, the number of positions, the flow paths and the number of ports. Hereisabriefbreakdown of how to read asymbol: Every symbol has three parts (see figuretoright).
Description. Safe Harbor Dam is a dam located just 5.7 miles from Millersville, in Lancaster County, in the state of Pennsylvania, United States, near Lockport, PA.escription. Safe Harbor Dam is a dam located just 5.7 miles from Millersville, in Lancaster County, in the state of Pennsylvania, United States, near Lockport, PA.
Lake Clarke boaters...buoys have been placed 1500' upriver of the Safe Harbor dam, these buoys mark restricted water....Boats must stay outside the buoy line. The Washington Boro area is reported to be shallower as the result of silting.Watercraft users are urged to use extreme caution in this area.he Safe Harbor tailrace areas are open to the public from dawn to dusk. Holtwood s Lake Aldred elevation is scheduled to be regulated between 169.2 and 167.5. There is no spill scheduled at Holtwood Dam Wednesday and Thursday. Spill begins at elevation 169.75.