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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />28 <br /> <br />Brantner Gulch Tributary II, Sub-Tributaries II-A and II-B, <br />and Mionr Tributary II-C (Sheets 22-30) <br />Tributary II and its sub-tributaries are located in Adams <br />County, primarily, with a small portion of the channels located <br />within the Thornton City Limits. This channel system is <br />bounded by Holly Street on tbe west, and East 136th AVenue on <br />the north. The channels extend southeasterly where they meet <br /> <br />Brantner Gulch west of Riverdale Road. The earthen channels <br /> <br /> <br />are narrow and deep on steep grades with moderately steep side <br /> <br /> <br />slopes. In Tributary II and Sub-tributaries II-B and II-C the <br /> <br /> <br />bottom of the existing channel is covered with low grass, but the <br /> <br /> <br />side slopes are brushy or covered with thick grass. Stock ponds <br /> <br /> <br />are located at the upstream ends of SUb-tributaries II-A and II-B. <br /> <br /> <br />Presently, Sub-tributary II-A contains cattails in the bottom of <br /> <br /> <br />the channel and brush and thick grass on the side slopes. <br /> <br /> <br />Culverts at Holly Street and Quebec Street are undersized for the <br /> <br /> <br />lOa-year flood and overtopping of the gravel roads OCCurs at <br /> <br /> <br />theSe points. The IOO-year flood is contained within the banks <br /> <br /> <br />of the channels for the full length. Land adjacent to the <br /> <br /> <br />channels is primarily farmland. No structures are located within <br /> <br /> <br />the IOO-year floodplain. <br /> <br />southeasterly to an intersection with Brantner Gulch just west <br />of Riverdale Road. The earthen channel is narrow and deep, on <br />a steep grade, with moderately steep, grassy side slopes. The <br />IOO-year flood is contained within the banks of the channel. <br />Land adjacent to the channel is primarily farmland, so no <br />structures are located in the lOa-year floodplain. <br /> <br />Brantner Gulch Tributary I (sheets 31, 32) <br />Tributary I is located in Adams County just east of Quebec <br />Street and south of East 136th Avenue. The channel extends <br /> <br />South Regional Park Tributary VI (Sheets 33-36) <br /> <br /> <br />South Tributary VI is located in Adams County. It origi- <br /> <br /> <br />nates just east of Quebec street, nOrth of East 136th Avenue, <br /> <br /> <br />and extends southeasterly to Riverdale Road and into the County <br /> <br /> <br />Golf Course and Fairgrounds, ultimately flowing into the <br /> <br /> <br />South Platte River. <br /> <br /> <br />The channel west of Riverdale Road consists of an open <br /> <br /> <br />earth channel, deep and wide, with moderate side slopes. The <br /> <br /> <br />laO-year flood is contained within the channel up to Riverdale <br /> <br /> <br />Road. The culvert under the north extension of Riverdale Road <br /> <br /> <br />and the culvert under east Riverdale Road are of insufficient <br /> <br /> <br />capacity to convey the lOo-year flood. <br /> <br /> <br />Since this portion of the ReaCh is undeveloped, no flood <br /> <br /> <br />damage occurs other than po@sible damage to the two crossings <br /> <br /> <br />of Riverdale Road as the water tops the roadway in this area. <br /> <br /> <br />The channel Southeast of Riverdale Road is not well defined <br /> <br /> <br />and is primarily a wide, gr~ss-covered depression through the <br /> <br /> <br />Golf Course to the Brantner Ditch. Brantner Ditch is a rela- <br /> <br /> <br />tively deep, open earth irrigation Channel on a flat grade, <br />