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<br />I 6) ~'M U.as~ Draw ana ~D rSown) Map Dr,;lJnagew~ P1anrllng Updilte <br /> ,.,:y" . <br /> Ci(y 0/ Littleton ;"(- Conceptudl Design Report <br />I -,,-' February 7006 <br /> 0." <br />I Table B.1 <br /> SummarY of Observations <br /> Discharge Max. Velocity Max. Flow Approx. Depth of Incised Street Overtopping Depth <br /> De th Channel # Flooded <br />I Reach From/To Ownership Average 10- 100- 10- 100- 10- 100- Estimated:Structure~ Comments <br /> Slope Year Year Year Year Year Year 0-3 It 3-6 It ,,-9 f 9-12 It 5-Year 10o-Year Return during <br /> (It) (It) ::erio:1 10Q-Year <br />I (cfs) (cfs) (Ips) (fps) (It) (It) Years <br />SJCQ (South) - - <br /> . - -.'--- - - .....--""~._~ -- ---- -.. .~ ._-. ....---- ._- --, -'~ <br />I South Plane Park to Centennial Reach comprised of a channel designed to <br />1 S. Platte Canyon Water and 0.5% 971 2281 7,7 9,6 7.2 10,5 4 Out carry the probable maximum flood (PMF). <br /> Sanitation buildings Construction of the PMF channel was <br /> Rd, District comoleted in 2005. <br />I <br /> 5 Platte 5 Platte <br /> S. Platte Canyon to ColumbinE Canyon Rd Canyon Concrete low flow trickle channel exists within <br /> 2 FP&RD 0.7% 957 2256 6,8 5.6 8,0 6.3 1,3 Rd 10-25 the reach. Debris collects at the culvert under <br />I Depew Trail 1.9 Columbine ColumbinE Columbine Trail. <br /> Trail 2.0 Trail < 2 <br />I 3 Depew to Kendall FP&RD 1.0% 905 2150 9.7 12,2 7,2 9.6 X Depew St 25.50 Channel is at least partly lined with boulders. <br /> 0,7 <br /> Reach contains several stable grade control <br />I Kendall 51 20ul structures and boulder lining. Significant <br />4 Kendall to Pierce FP&RO 1.3% 818 1961 9,8 11.6 8.5 11.0 X 0.9 25-50 buildings degradation has taken place in a portion of the <br /> reach and one grade control structure has <br /> failed. <br />I Pierce to Pierce St Low flow grade control structures and one <br />5 FP&RD 1.3% 745 1821 8.2 9,9 6.8 8.3 X 10,25 larger drop structure (at the east end) exist <br /> Wadsworth 1.5 within reach. <br />I 6 Wadsworth to Carr FP&RD 1.6% 385 937 7.9 9,5 4.0 5,5 X Deenlv incised channels exist within reach. <br /> 1 House <br /> 7 Carr to Ken Caryl Private 1.5% 348 830 8,0 8.9 5,6 7,1 X Iearr 51 0,1 Carr 512.0 2-5 2 Out Channel flows through private property and <br />I buildinas vertical banks exist in portions of reach. <br /> The Ken Caryl to Garrison segment contains <br /> Jefferson three drop structures. The slope in this <br />I 8 K C I K r County, ROW 1.3% 295 694 7,1 8,7 10,9 11.5 Garrison St 25-50 segment is 1.3%. A concrete tow flow channel <br />en ary to lp Ing HOA and . 1.5% 0,9 and one large drop structure exist between <br /> Private Garrison and Kipling. The slope of this <br />I senment is 1.5%. <br /> Kipling to Ute FP&RD 6,9 8,1 3,5 4.9 lOut Reach characterized by stable slopes and <br /> 9 Meadows School 2.2% 271 574 buildinn banks and nds on the western half. <br />I s.JGP (Southl.Tributary N()..1 ,. , - <br /> .-.-- - .,- - , ...-..-.-.----- ... ------ <br /> Confluence to Portions of the reach contain an incised <br /> 1 Wadsworth FP&RD 2.0% 302 721 8.6 7,9 4,3 5.7 X channel. <br />I Wadsworth Reach is stable and contains wetlands. Two <br /> Wadsworth to Carr FP&RD 2.0% 212 491 6.6 8,5 2.7 6.0 25-50 trail crossings act as grade control and are well <br /> 2 Blvd 1,1 <br /> armored. OraD structure exists at the west end. <br />I 0\ <br /> B-3 <br />I <br />