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BASIC AND GENERAL DATA DRAWINGS COMMUNICATIONS AND POWER SYSTEM MAP A Communications and Power System Map is included in the Master Plan to show the general location and extent of all existing and proposed telephone, radio, and power system installations which serve the park or monument. The plan is prepared by the Branch of Engineering at a scale corresponding to that of the General Development Plan. The communications and power data should be somewhat emphasized in delineation while topography and such elements as roads, trails, developed area locations, patrol and shelter cabins, and fire lookouts should be subordinately but clearly indicated. Standard Symbols are used to indicate the following data: Existing and Proposed The Telephone System General locations of aerial and underground lines designated by sections to conform to the telephone chart. Show also the location of all telephone stations. The Radio System. The location of all radio transmitting and receiving stations, with their call letters, should be shown. For clarity the radio system may be drawn on a small scale outline map of the area, placed conveniently on the sheet. The Power System If the park or monument is served by a central power system whose source of supply is from commercial or other lines outside the park, or from a central power plant inside the park, the location of the source and of the main distributing lines should be shown. Where the various developed areas of a park or monument are served by individual power plants, the general locations of such plants may be shown on this plan provided their delineation does not confuse the drawing. The distributing lines of individual systems should be omitted, since the scale of the drawing will in most cases preclude their legible delineation and since they will appear in detail on the Utility Layout Plan for the developed area concerned. WATER RIGHTS AND WATER SYSTEMS MAP Instructions for the preparation of such a map, when required,will be obtained through the Branch of Engineering or the Hydraulic Engineer of the Water Rights Section. Refer also to "Water Rights Influence on National Park Service Water Systems," dated January 6, 1940, by A. Van V. Dunn. 35
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