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I I I I I I I I I I I I I I I I I I I 21 The opening under Wolff street is so small that considerable backwater is caused upstream. Overflow at Wolff Street occurs at a maximum depth of 5 feet with associated flooding of resi- dences and commercial establishments on both sides of Lakewood Gulch. Backwater created west of Tennyson Street is expected to flood residences on the north side of the Gulch. At Tenny- son Street, the expected maximum depth during overflow of the street is three feet. Between Tennyson and Perry Street only two footbridges are inundated. At Perry Street the maximum depth of overflow is estimated to be about four feet. Since Perry Street is nearly level between Lakewood Gulch and W. 10th Avenue, it is expected that shallow flooding will be experienced along Perry Street in the described area. Several residences east of Perry Street are expected to be flooded during the 100- year event. Boulevard only two footbridges cross the Gulch, both with inadequate openings to pass the lOa-year flood. The bridge which carries Federal Boulevard over Lakewood Gulch has a sufficiently large opening to carry the projected 100-year flood without causing a rise in the water surface upstream of the bridge. Debris could cause some obstruction when lodged into the bridge supports. Federal Boulevard to Decatur Street (Sheets 20, 21) The flood plain in this reach is limited to Rude Park and a strip of approximately two hundred feet in width of undeveloped land along the north bank of Lakewood Gulch. Damage due to flooding is limited to the cost of cleaning up and possibly removing silt and trash. w. 10th Avenue to Federal Boulevard (Sheets 19, 20) The inadequate bridge opening at W. lath Avenue causes overflow of the street to a depth of 2.0 feet. Between W. lOth Avenue and Knox Ct. two railroad bridges cross Lakewood Gulch; both have openings too small to pass the 100-year flood. Both bridges are inundated during the projected flood event. The bridge opening at Knox Ct. is also inadequate and causes ponding up- stream of Knox Ct. and inundation of Knox Ct. to a depth of 4.5 feet during the laO-year flood. Between Knox Ct. and Federal Decatur Street to South Platte River (Sheets 21, 22) Lakewood Gulch in this reach is a well defined channel but nevertheless causes extensive flooding due to its inability to convey the lOa-year flood. The north bank of the channel con- sists of a nearly vertical wall of either concrete or wood construction. Features constricting the flow and causing flooding include the box culverts under Decatur Street, the bridge on Canosa Ct., the private bridge upstream of the rail- road bridge and the railroad bridge near the South Platte River. The Satellite Maintenance Facility of the City of Denver, located immediately south of Lakewood Gulch and east of the