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Show 95 reimburse such agency for additional cost incurred.124 Also, such federal agency having jurisdiction over the dam must design and construct the bridge and determine that it will be structurally feasible and will not interfere with the proper functioning and operation of the dam. In addition, the surveys of navigable streams shall include stream-flow measurements and other investigations of water- sheds necessary for planning and proper consideration of all uses of the stream affecting navigation.125 Other Data.-A great variety of information is obviously necessary in connection with preparations for navigation im- provements. Reference will later be made to certain basic data available to the Army Engineers and regularly assembled by other agencies, such as the Coast and Geodetic Survey, the Geological Survey, and the Weather Bureau.126 Moreover, in addition to stipulating the inclusion of specified information in reports on examinations and surveys, already discussed, Con- gress has directed the Army Engineers to obtain other data. In 1871, it directed the Secretary to have water gauges estab- lished and daily observations made of the rise and fall of the Mississippi River and its tributaries.127 It should also be noted that Congress has declared that, in the preparation of projects, channel depths referred to shall be understood to signify the depth at mean low-water in tidal waters tributary to the Atlantic and Gulf Coasts, and at mean lower low-water in tidal waters tributary to the Pacific Coast, and at mean depth for a continuous period of 15 days of the lowest water in the navigation season of any year in rivers and nontidal channels.128 Likewise, channel dimensions specified shall be understood to admit of such increase at the entrances, bends, sidings, and turning places as may be necessary to allow of the free movement of boats.129 *» Act of July 29,1946, § 1,60 Stat. 709, 23 U. S. C. 64. m Act of June 25, 1910, § 3, 36 Stat. 630, 668, 33 U. S. C. 546. ** See infra, pp. 342-348. mB. S. 5 5252, from Res. of February 21, 1871, No. 40, 16 Stat. 598, as amended, 33 U. S. O. 4. m Act of March 4,1915, § 5, 38 Stat. 1049, 1053, 33 U. S. O. 562. 911611-51------8 |