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In a majority of such instances , the recommended 1:12 slope is neither needed nor wanted by people using wheelchairs ( Kiewel , 1986 ) . This act directs the commissioner of personnel to conduct a study of the state 's classification system and include as focus areas , the general soundness of the current system and whether the system affords internal fairness and equity without gender bias or other biases . Slope is calculated by dividing the total rise ( the height ) of the ramp by the total run ( the horizontal length ) of the ramp , and is written as rise : run ( for example 1:12 ) . The harder one tries to pull against it to shake it off , the more the grief constricts . One electric motor to turn the vertical screw is all that is required for its operation . The slope is extremely important because it affects how difficult it is to travel up and down the ramp . Slope is the term used to describe how steep a ramp is . While a 1:12 slope is recommended and preferred , it is understood that following this guideline will not always be possible or practical , especially in existing buildings . The vertical screw is enclosed in a painted sheet metal housing with a flexible plastic flap to protect the screw from dirt .