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<br />1-3 <br /> <br />plain is designated by the use of new road crossings and some minor <br />channel modifications. From Taft Street to Parfet:, a grass-l ined <br />channel will narrow the flood plain where there have been adjacent <br />housing developments and to intercept the flood waters before they <br />start spreading out into Wheat Ridge. In final design this channel <br />can be designed with variable sections ~o blend with any possible <br />park improvements, thereby approaching a natural flood plain. From <br />Parfet Street to West 38th Avenue crossing Lena Gulch is planned to <br />flow through several sections of concrete type channel. The <br />Red Barn and several other structures have been icentified for re- <br />moval to allow the construction of a minimal widtt" channel, From <br />West 38th Avenue to the confluence with Clear Creek a grass-I ined <br />channel has been selected in a readjusted ,,1 ignment which mOI'e <br />closely patterns the historical thalweg. Overall, the selected master <br />plan would be catagorized as a "soft approach" to flood control efforts, <br />Had flood plain zoning and management been implemented twenty-five <br />years ago along Lena Gulch, what is achieved with irrplementation of <br />their plan for about $4.5 million would be mostly available now at <br />very I ittle public cost. <br /> <br />PHASE A SYNOPSIS <br /> <br />Phase A of this study defined the problem hydrologically and hydrauli- <br />cally by field and office studies, to develop all practical alternates, <br />and to study these alternatives usi,1g a team appf'Oach. An inter'im <br />report was prepared dated January, 1974. <br /> <br />Field studies of Lena Gulch Basin were made and the entire reach was <br />wal ked. Hydrological and hydraul ical studies wer'e then prepared to <br />determine the 10, 25, and 100-year flood magnitudes and floodplains <br />for present and future land use conditions util izing the storm drain- <br />age criteria of the Urban Drainage and Flood Control District. The <br />following Table I-I presents the 1Ol.1-year flood magnitudes and flood- <br />plain widths at different locations along Lena Gulch for the existing <br />channel and for the master plan channel. <br /> <br />The extent of flooding was related 1:0 general First flOCH' levels of <br />structures. Damages were tabulated according to type of structure and <br />similarity of levels of flooding for each reach. Table 1-2 presents <br />a tabulation of damage in each governmental entity, <br />