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<br />~ <br /> <br />V. CONCLUSIONS <br /> <br />A. Major Drainageway <br />The character of the major ephemeral drainageway, combined with <br />the large detention storage behind the railroad embankments limits <br />the 100 year discharge through the embankment culvert (just east of <br />the U.S. Highway 34 overpass of the railroad) to 70 cfs. The 100 year <br />flows downstream of this embankment will, however, require either <br />flood plain regulation and/or channelization to pass the anticipated <br />discharge without significant damage. The analysis also shows that <br />even extreme event storms are unlikely to result in overtopping the <br />railroad embankments and any surface flows being directed toward town. <br />B. Urban Basins <br />The presently developed portion of Yuma north of the railroad <br />embankments will continue to flood the businesses and residences along <br />the north side of the railroad embankment until facilities are planned <br />to either detain flood waters before the flows reach Railroad Avenue or <br />a formal means of flood conveyance is provided. <br />Basin Cl, which is directly tributary to Lake Yuma, passes through <br />very flat slopes downtown, causing damage to the residences west of the <br />commercial area and damage to the businesses within the commercial area. <br /> <br />-16- <br />