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<br />For control structures, the known water surface elevations as pro- <br />vided by a rating curve can be read on an X5 card for multiple profiles. <br />However, for a given X5 card, the data must consist entirely of either <br />known water surface elevations or of differences in water surface eleva- <br />tion. Both types of input cannot be placed on the same card. <br /> <br />17 <br />