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<br />n <br /> <br />emban~ment ~s toe only outlet for the pond. ~o mobile home parks containing <br />40 trailers l1e In the effected area. velocities are again very lo~ 10 tne <br />ponded.>r....dndaedlm..nt...tllbedeposlted. T'he ponded....ter l'OUst overtop the <br />Great Western Railroad before flowing overland tQ the Little Thompson River. <br />The 100- and 500-year flood plains "s~ci..ted with the Eastern Flow path, <br />assuming the Union Pacific Railroad embankment is intact, are ShOwn in Figure <br />19, Floodwater.. impoundedby' the Union P;>.ciUc Railroad embankment on th.. <br />nOrtn and COunty Hnad 2J on tne east ~ck Into en.. nouses ano property east or <br />DOrothy Avenue. Approximately 12 houses are ~ffected by flooding up to fIve <br />feet deep. Velocities in the pond are less than One fpa and considerable <br />sedIment from upland runoff settles out. The 19B2 flood overtoppe~ the Union <br />pacific Railroad enban~ment causing substantial ~mage to an additional <br />Sl homes north of the embankment. The extent of flooding resulting from the <br />embankment failure i8 indicated in Figure 19~. <br />Wh..n th.. flood l..v..l rt".", Buffid..ntly. "hp p..",~ ""..~t,,!,e mrnthy ~w,,,,\,,,. <br />nMr BroadStreet and flows west down the street to join the Wla park <br />Tributary. Homes an~ businesses along the way will under90 some flooding as a <br />result. The deqr..e of failure aeBociated with the railroad eMbankment <br />directly affecto the lccation and severity of flooding in this location. <br />The likely extent of flooding produced by the 100-year flood event on the <br />Western Flow ~th is shown in ~igure 20. Since Br.C-2 modeling was not appli- <br />cable here, the boundary indicated was based on the extent of flooding <br />exper1encedonJune3, 1981,aneventofbetween35-andl00-yearint..n"ity. <br /> <br />Caus.." of ~lood1ng <br />Runoff from the Milliken wat..rehed naturally spreads aeroee the entire <br />lower basin enrout.. to the Little ThOIllpson River. Man. through the y..ar..., hae <br />built variau... obstructions acroee the ba...in expans.. without allowing an ade- <br />quatepath through the b<>.rriers for the runoff which has increased a3 the <br />ba"in hae developed. These obstructions concentrate the water forcing it to <br />mav.. laterally toward a lower elevation. unfortunately. the point where all <br />of the watershed's drainagc concentrates is Milliken. <br />Flow entering Milliken via the Western Flow path creates two major <br />problems (1) flooding on Quentine ~venuc and (21 er08ion on Quentine, pauline. <br />Olive. Norma, and Marjorie ~vcnucs "outh of Broad Street. The flooding on <br />~entine ~venu.. re6ults from the inability of water which branches west at the <br />