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0J1970 b. . The timing in availability of funds is likely to be a critical, factor for the ~fficient integration and coordination of studies, and this . can best be regulated if all programming and budgeting are done by the agency responsible for the integrated planning, 7. Staj;tes of Plan Preparation. The evolution of a multiple-purpose reservoir project normally passes through three main stages consisting of (a) the investigation stage that produces a preauthorization plan' affording the basis for legislative or administrative authorization for the project, (b) the detailed design stage undertaken subsequent to authorization and after project funds are appropriated, and (c) the construction stage after final design is essentially completed. Preparation of the PAR Development Plan should proceed concurrently with the above stages and in somewhat the same degree of refinement as the other features of the overall project plan~ including the dam and appurtenances. The preparation of the PAR Management . Plan may be deferred substantially until the construction of the dam is nearing completion, although some preliminary study therefor should be initiated when the land acquisition is initiated. However, the latter planJ as further discussed in paragraph 11, should be reasonably complete by the . time reservoir storage begins. Thus, at the first stage, the preauthor;. ization plan and report for a reservoir project should contain at least an outline of values and resources to be preserved, protected and developed and the general magnitude and char.acter of the PAR development and use potential. At the second stage of the project planning (detailed precon- struction design stage) and just prior to initiating land acquisition for the overall project, a PAR Development Plan of preliminary type should be prepared. This plan may be in only sufficient refinement to define cl~arJ:y. the fundamental requirements for resources development and use, such as land, water supply, sewage disposal, prinCipal access arteries, etc. Of course, this should be. coordinated with an initial appraisal of the .antici- pated future management needs as welL Since land is a particularJ:y impor- . tant consideration at this stage, the preliminary PAR Development Plan should show the "take line" prescribing the land needed for all of the re- sources, purposes, and potentialities. At the third stage of the project, a PAR Development Plan of final type should be prepared concurrently with initial construction work on the dam, and it should be so scheduled that it will be completed and approved at least one year oefore storage in the reservoir begins. It is considered essential that the critical elements of' this plan be crystallized at a sufficiently early stage to permit COll- . ' struction of the initial phase of the basic public-use and enhancement fa- cilities before storage begins. The initial phase facilities are those ex-, pected to be needed for the first five to ten years of the project operatio~. 8. Content of Preauthorization Plan, While a brief PAR Development Plan is essential for inGlusion in the preauthorization report, relativeJ:y little detail is necessary at that stage. The related management aspect also should be covered in a general way mainJ:y for indicating the proposed administering agencies insofar as practicable at that stage and to point out any special management circumstances known to exist. In the brief develop- ment plan, the reservoir values and the public-use and development require- , ments may be covered in fairly broad terms at this first stage, and the -5-