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CHAPTER III MASTER PLAN DRAwINGS ~~_._,~-~-_._._--,----_.,.._-- Introduct.ion ~---_.-----~--_. All drawings referred to in this re"Jort are presented in Volume II. The base maps for drawings numbered 1 through L~ are taken from the Phase A report. They depict the drawings list., location of the First Creek basin, index maps, plan and profile legelld, and basin and sub-basil) boundaries. Drawings 5 through 8 show the lOO-year design hydrographs. These hydr'graphs represent flows at selected design points within the drain- age basin. The peak flows from these hydrographs were presented in Tabl e II -4. Drawings 9 through 32 present the docainage"ay planning for First Creek in the form of plan and profile sheets. These drawings show the proposed drainageway improvements and the future 100-year flood plain corr',sponding to the improved drainageway. Also, the future lOCi-year floolj plain corresponding to the exist.inl~ drainageway conditions is pre- sentl~d for reaches where structural improvements are not recommendf~d, The major drainageway plannj,ng drawl.ngs COIltain sufficient detail III both plan and profi le for planning purpo:3es. Therefore, the fol low.. ing discussion will not contain any speci fics foy individual improve" ffientl;. Also, throughout this chapter, t.he ":erminology flood plain zoo., lug ::or a specific reach is intended to mean: 1. As soon as it is practically possible, the area within the 100-year flood plain for fut.ure basin development and existing drainageway conditions should be desigTled as Flood Plain Zone. 2. At such time in the future, \vhen the drainageway improve- ments suggested in this report are imp_emented, the Flood Plain zoned areas as in 1 above should be moclificd to cover areas under the future 100-year flood with imprcv~d dr.inage"ay conditions. TIT-I