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<br />I <br /> <br />I <br />I <br /> <br />19 <br /> <br />add significantly to the flood flow in Wonderland channel. It was <br />assumed that the flood waters in Wonderland Lake would be released <br />gradually after the flood waters had subsided. <br /> <br />I <br /> <br />There will be a year-round, low flow in all of the proposed channels. <br />This low flow will probably increase as urbanization expands. Since <br />the inverts of some of the proposed channels are below the present <br />water table, the channels will act as a drain in some areas and lower <br />the surrounding groundwater table, This lowering of the groundwater <br />table wil J have a beneficial effect for the urbanizing area. Steps <br />have been taken for the City to claim this water for beneficial use. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Sediment that is produced in the foothills and carried down in Twomile <br />Canyon and Fourmile Canyon Creeks would settle out in the proposed <br />channels. This sediment must be collected at the canyon mouths in <br />sediment basins and mechanically removed. The day-to-day flow of the <br />creeks will produce relatively I ittle sediment. Most of the sediment <br />wil I come down out of the foothills during rainstorms. Sediment <br />producing storms are expected to occur several times a year. <br /> <br />I <br /> <br />I <br /> <br />The sediment collected in the basins can be used for construction pur- <br />poses in order to help pay for sediment removal operations, and to <br />attempt to convert this "resource out of place" to a resource of bene- <br />ficial use to the community. It is for this same reason that the <br />City has claimed the project developed water, which is in accordance <br />with the DRCOG Manual. <br /> <br />I <br /> <br />'I <br /> <br />I <br /> <br />From a hydrological standpoint, it is advantageous to couple water- <br />ways with greenbelts and open space. The uses are not only compatible <br />in the Boulder area, but create mutual benefits. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />