Forest road location and design in the Douglas-fir region Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ms35tb60v

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  • The purpose of this thesis is to outline the principles involved in the reconnaissance, survey, and design of forest roads in the Douglas-fir Region. The reconnaissance survey is the most important element in road location. Poor reconnaissance often results in abandonment of the route at considerable expense. The ground slope affects the type of reconnaissance employed. In level country alignment controls the location of the road and grade is adapted to the topography to balance excavation and embankment quantities. In sidehill country grade controls the location of the road and alignment is adapted to the topography to balance excavation and embankment quantities. The reconnaissance survey may be separated into extensive and intensive reconnaissance. The extensive survey is the study of an area or drainage to determine the general location of the route. The intensive reconnaissance is a study of the ground adjacent of a route often involves the comparison of one or more alternatives. A preliminary survey is conducted along the final reconnaissance line to establish horizontal and vertical control and the topography on either side of the line. The precision desired determines the method of survey employed. The staff compass-tape-abney survey is the most widely used method in the Douglas-fir Region. The road is designed from the data obtained from the reconnaissance and preliminary surveys. These data are studied graphically using the plan, profile, and cross sections of the route or any combination of these graphic aids. Center line of the road will closely follow the final reconnaissance line if the intensive reconnaissance is thorough. Regardless of the method of design used, the final center line is a compromise between optimum alignment and minimum excavation.
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