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<br />20 <br /> <br />(see quotation from Army Engineers' report, given above) and it seems <br />doubtful if this tendency can be fully overcome by manipulation of reser- <br />voir levels. <br /> <br />To show the end result of TVA' s construction on flood condi- <br />tions along the Tennessee River from KnoXVille to its lIlOuth, Chart XVI <br />has been prepared. It is in profile form, and shows: <br /> <br />1. The permanent water Une, before and after the dams <br />were built. <br /> <br />2. The flood Une, before and after the dams were <br />bull t. <br /> <br />The chart speaks for itself. It seems evident that TVA flood control is <br />not the kind that is realized when the tested, standard methods des- <br />cribed in this paper are used. The regime of the Tennessee River has <br />been radically changed by the works of TVA, but protection to the lands <br />formerly flooded occasional.ly along it has not been accomplished. Most <br />of them now are flooded permanently. The remainder, together with some <br />additional land formerly far above the flood line, is subject to periodic <br />flooding not much different from that caused under natural river condi- <br />tions. <br /> <br />To realize effective and certain flood control in the many <br />localities where it is practicable will require technical skill of the <br />highest order, as the problems to be considered are among the I1IOst com- <br />plex in the engineering field. But IIlOre than good engineering will be <br />needed. Flood control should be the paramount purpose of the projects <br />built to accomplish it. Attempts to subordinate it and impair its <br />effectiveness by combining it in multi-purpose projects with other ob- <br />Jectives on a baeis of equality Should be prevented. OtherNise the <br />safet" of the community to be protected may be compromised. <br /> <br />C N Phillips <br /> <br />CNP:lbw <br />