H. NAVIGABLE WATERWAYS - FIGURE 12 Rationale: Navigable waterways were considered as absolute exclusion variables due to the possibility that the microwaves beamed to the rectenna could interfere with sensitive navigational equipment. Additionally, these navigable waterways could not be spanned by the rectenna due to physical interference with navigation. Reliability of the Data: Those waterways indicated as being navigable were mapped from the Oxford Regional Economic Atlas:United States and Canada, published by the Clarendon Press in 1967. Those rivers marked as navigable include some areas with less than six feet of controlling depth, but the majority of these waterways have a navigable depth of 10 or more feet. There are certain problems with this map. First, new navigation projects that have been completed since 1967 may not be included. Second, routes through the Great Lakes may be less rigid in fact than is indicated on the Oxford Map. Third, the seaways adjacent to the coastline and the entry and exit routes from the seaways into coastal seaports are not included on this map. This information exists in the form of numerous maps of various segments of the United States coastline, but there was insufficient time to assemble this information for inclusion in Figure 12. These seaways adjacent to the coast would be a major exclusion variables for rectenna sites on the Outer Continental Shelf. Spatial Coverage: There are 582 grid cells that are identified as cells where navigable waterways exist. I. INTERSTATE HIGHWAYS - FIGURE 13 Rationale: Due to the large capital outlays for interstate highways and the investment patterns associated with these infrastructure items, the decision was made to map these arterials and to consider them as absolute exclusion variables. Although this designation is question-
RkJQdWJsaXNoZXIy MTU5NjU0Mg==