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I I I I I I I I I I I I I I I I I I I is conveyed in an open channel, interruoted hy undersized culverts requiring r:IJAPT~R II considerahle maintenance. The flood Dlain st'Jdylimit is approximately 500 feet west of Jay Street. The City of LakewDod park between Jay and Teller STI'DYA,f1FA nFsrpIPTHW ^ r,PIFRA.L Streets has no name and is only known as Dark on 1st and Teller Streets. T~e T~e Heir r;ulc~ Trihutaries are locaterl in La"e'~oo~ an~ "enver in t~e basin boundaries are shown on Figure 11-1. area sout~ of nth Avenue and west Of Ferleral f!oulevard. T~'e ,'Iesterlv 1 il'lit is in t~e vicinity of "'adswort~ P.oulevard. T~e 'lepew Street Suh-basin is C. DAKflTA AVENUE TRIBUTARY located in the south'vest Dortion of t',e 1st Avenue Tributary basin. The nakota Avenue Tributary is in the jurisdiction of t~e City of Denver east of Sheridan Boulevard. West of Sheridan Rouleyard the City of Lakewood !i. 1 ST AVE'IIIE TRIBlITARY has municipal jurisdiction. The northerly limit of t~e hasin is '..est Alameda T~e 1st Avenue Tributary is in the .iurisdiction of tile ritv of 'lenver Avenue and the southerly limit is approximately one-~alf l'1ile sout~, of Hest Alameda Avenue. The westerly limit of the drainage basin is approximately het"leen its poi nt of di sc~a rqe and Sheri dan 'loul eva rd. I'!es t of S!,eri dan floulevard the City of Lakel~ood has municipal ,jurisdiction. The fart',est one-~alf mile west of Wadsworth Boulevard. The basin is fully developed northerly limit of the drainaqe hasin is 6th Avenue. The southerly limit east of Sheridan Roulevard, and approximately 60 percent developed west of Sheridan.l The basin is approxil'1ately 2 miles lono ann ').25 mile ,.fide. The is !.jest Alameda Avenue. The hasin is fully developed east of Sheridan Boulevard and estimated to he 30 percent cieveloDed west of Sheridan P,oulevard. average slope is approximately 1.5 percent. The UDper Dortion, I-test of Harlan, The total basin is approximately 2 miles lon'l and ahout 'J.~ I'lile l1ide. The is very flat while the reach east of Sheridan is of ahove average steeDness. ayera'le slope of the thal'veg is approximately 1.5 percent. East of Sheridan Between Heir Gulch awl Sheridan Boulevard pipes ranoino frol'l 30 to 36 inches Boulevard, about 60 percent of 1st Avenue Tributary to Heir Sulci, is confined in diaMeter and streets convey the runoff of the tributarY. From Sheridan to oiDes ranoin'l from 42 to 54 inches in ciiameter. Intermediate sections !ioulevard ",est to nepew, drainage is conveyed in an ooen c1annel. An existinp consist of Doorly maintained ODen c:lannels. A.14"x51" elliptical concrete dike with an approximately 10-foot '''ide oDenino is located ahout half"ray piDe extends from an ooen channel Ji)') feet east of Shericia.n Roulevarr to hetween Sheri dan Roul evard and 'leaew Street. T',e rli ke creates tempora ry the aporoximate center of a depression in S~2ridan Boulevard nort', of 1st detention stora~e in this section of t~e tributary. Retween nepew and Eaton Avenue. At t~is point, two triple inlets convey runoff to the elliptical Streets, a 42-inc~ diameter concrete aiDe conveys the drninage. From Eaton concrete pipe. A 24" diameter corruaated metal pipe also discharges into to Harlan Streets, an open channel defines t'le trihutary. At West 'le'lada the elliotical pioe, carrying runoff frOM an open c~annel terminating at Place and Harlan Street, a 27-inch diameter concrete nipe discharges the northerly extensi on of Chase Street. From rhase to Jay Street, runoff lThe area west and south of Villa Italia is 'lresentlv zoneci agricultural, hut t~e Lakewood Planning Oepartment expects commercial development.