"the preferred launch ramp slope of 15% will allow the boat trailer to be in deep enough water to launch and retrieve from the trailer without the rear tires of the tow vehicle being in the water." a graph on page 26 shows a range of slopes from a minimum of 12-percent to a maximum of 15-percent.. The slope of the boat ramp should be steep enough to launch the boat without the vehicle entering the water. generally, ramp slopes from 15 percent (1.5 feet of drop. Not all ponds need boat ramps. you can build a simple sloped gravel ramp for occasional use or a concrete ramp for heavier traffic. concrete ramps should have a 12-15% slope and extend far enough.
1.2 scope of boat ramp design . the scope of the design generally extends from the connection with landside facilities (that is, the anchor beam or the start of the connecting slab) down to the toe of the ramp.. Over 15% and the grade is too steep for many vehicles to pull the boat and trailer out of the water. we build mostly cast-in-place reinfored concrete ramps and improve traction on the ramps by using a "grooving tool" for finishing. the grooving tool is a flat plate with 1" angle iron welded to it at about 3" spacings.. Boat ramp see launch ramp. bull rail a rail, usually 4"x 4" treated wood, spaced above the deck surface around the perimeter of the floats used to tie-up and secure boats..
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