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<br />The second criteria used for prioritizing projects is the magnitude of potential <br />damage. both in loss of life and property, that would result from potential flooding <br />created by inadequate facilities. Based on this criteria, area~ which are heavily <br />developed are more likely to sustain damage from 1100ding than are undeveloped <br />areas. The third criteria used in e~tablishingpriorities for improvement projects is <br />the need to reduce the limits of the 1100dplain and make more land available for <br />future development. This criteria does not include channelizing runoff in existing <br />l100dways of undeveloped area" but rather improvillg the capacity of existing <br />structures, thereby reducing backwater pondingdepths and decrea sing tbelimits of <br />the flood plain. The development of channels between existing structures will be the <br />responsibility of the property owner. <br /> <br />Bennett Avenue. Therefore, it is recommended that as its first priority, the City of <br />Cripple Creek complete the recommended Second Street tribL1lary improvements. <br />The costs for these recommendeJ improvements is approximately $460.000 which <br />may result in the improvements heing conmucted over a perind greater than one <br />year. As a minimum, the first priority should include the new outfall line from <br />Warren Avenue to the north siJe of Bennett Avenue along with tl1e new inlets and <br />storm sewer in Bennett Avenue and the courthouse storm sewer. The remaining <br />improvements within the Second Street tributary could be completed during <br />implementation of the priority no. 2 projects. <br /> <br />In October 1992, the Soil Conservation Service will release their Flood Plain <br />Management Study for the City of Cripple Creek which will include mapping showing <br />the existing flood plains. This mapping will show that several existing structures were <br />built within the limits of the flood plains. These structures will be subject to damage <br />and there will be some potential for loss of life should an intense thunderstorm. <br />approaching the magnitude of the design Storm, occur in the Cripple Creek or Pony <br />Gulch watersheds. The city is taking an aggressive approach towards implementing <br />drainage facility improvements, but the resulting cost will requirc that these <br />improvements be implemented over a pcriod of several years. The following is a <br />general list of project priorities the city may consider when undertaking drainage <br />struClllre improvements. It is very likely that as development eontinue~, some <br />adjustments in these priorities will have to be made. It is highly p{)ssible that some <br />of the individLwl improvements in each project description can he completed by city <br />forces (i.e., replacementofroaJcro~singculverts in outlying areas) but the majority <br />of work will most likely be completed under one or more construction contracts. <br /> <br />As tl1e busine~s district is the most fully developed area within the city and subject <br />to tl1e greatest amount of ongoing development, flooding and the ass ociatedproperty <br />damages are of major concern. Therefore, the city's second priority for drainage <br />facility improvements should include completion of the Bennett Avenue storm sewer <br />system at Third Street and Fourth Street. These improvements should include <br />installation of all inlets, storm sewer piping and the outfall lines from Bennett <br />Avenue to Cripple Creek. <br /> <br />l1teareaiJlCrippleCreekwhielth.,~histuricallybeeJl;,ubjeet"Jtothc::nlll;,tfreljuc::ut <br />flooding: pmhlc::ms i, the area surrounding the intersection of Second Street and <br /> <br />Considerable vaeant ground exists along Cripple Creek, Poverty Gulch, the Main <br />Street tributary and Upper Cripple Creek. Development is most likely to begin in <br />those area.~ in the near future. Due to the size of conduits at existing road cro~sings <br />of Cripple Creek and its tributaries, an extensive flood plain is created due to <br />pnnJing rCljuirements at the conduits and potential for roadway overtopping by flood <br />flows. TIle cily's third priority for drainage structure improvements should include <br />culvert replacements/improvements at each roadway crossing of Cripple Creek and <br />its trihutaries. This work ,hould begin at the downstream end of Cripple Creek with <br />work commencing upstream until each crossing i~ completed. Due to the magnitude <br />of work involved. the~e improvements will most likely have to he undertaken a~ <br />several smaller projec.ts. This is an area where future development may dictate II <br />change in sequencing of projecl~_ Fm example, it may be necessary to complete <br /> <br />VIl.Il <br /> <br />VTl-12 <br />