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<br />The 100-year frequency flood is the flood event used for flood delineation and <br /> <br />DRAINAGE MASTER PLAN <br /> <br />regulation by the State of Colorado. The Flooded Areas Plates (3 - 7) depict <br />only tM boundary of the lOO~year floodplain. Since the base maps for the <br />Floodt'd Areas plates is a 2~foot contour map, the outl ines of the floodplains <br />of other frequencies (10-, 50-, and 50D-year) can be plotted from the information <br />in Tables 4 and 5. <br /> <br />[)escri~tion <br /> <br />The floodplain study also included an evaluation of particular drainage problems <br />in the community. The evaluation included an assessment of the existing drainage <br />and facilities and recommendation of measures that can be taken by the Town to <br />improve local drainage. <br /> <br />The objective of the plan was to outline any improvements that will eliminate <br />the regular ponding areas around town. The improvements are primarily to provide <br />positive drainage for the frequent summer rainstorms, with secondary concern for <br />the hydraulic capacity of the system. Also,tn8improvementsareofatypt'that <br />Town work crews can install the facilities. <br /> <br />Types of improvements considered included roadside ditches, small culverts, <br />changed street grades and changed drainage patterns. The following paragraphs <br />discuss the existing drainage facilities and patterns and reeo~ended changes <br />to that system. <br /> <br />Existinq Drain~ge System <br />North Mancos <br /> <br />The no rth ~lancos a rea i nc 1 udes th e a rea north of U. S. 160. P 1 a te 18 shows the <br />existing facilities and drainage patterns in the developed north area. The <br />existing dra; nage heil; ties dr~ located east of S.H. 184. Roadside ditches on <br />Menefee, Sunset and alleyways drain the hillside to the irrigation ditch and <br />roadside ditch along S.H. 184. A berm has been constructed at the north and <br />east endof:.lenefee to divert storrnwater runoff away from the prop ertiesnorth <br />of ~~nefee and into a roadside ditch along Ervien. <br /> <br />No pipe outlet exists for runoff tributary to Ervien and the frontage road. <br />Storm runoff will overflow the intersection and sheet flow across pr operties <br /> <br />-27- <br /> <br />-28- <br />