Laserfiche WebLink
<br />40 <br /> <br />5.4 Development features <br /> <br />Development features in the flood plain that reduce flooding can provide added flood pro- <br />tection for flood proofed structures. One of the 1l10st prominant features that exist in flood <br />plains are various types of embankments. Highway, streets and railroads all require <br />embankments and are often located parallel to ll1ajor streams and rivers. Often times these <br />embankments reduce or even eliminate flooding in nearby areas. The areas downstream of <br />embankments generally have lower flood velocities and flood depths outside the main chan- <br />nel. Figure 5,5 shows an example of a large embankment which provides flood control pro- <br />tection on Dad Clark Gulch at Broadway Street Crossing in the Denver metropolitan area, <br /> <br />Another type of development feature that can be considered is streets. Streets by their <br />nature have a capacity to carry water. As the grade increases, this capacity incrlOases. Thus, <br />streets paralleling and draining away from ponding areas can be used to reduclO flood depths <br />by eliminating standing and shallow flooding. <br /> <br />Development features to reduce flooding are not being advocated by the preceding discus- <br />sion, However, when they do exist, the areas that are affected by the reduced flood potential <br />can be considered as potential flood plain development areas, <br /> <br /> <br />Figure S,S,A roadway embankement which was designed and constructed to provide 100 year flood <br />control protection to downstream f1oodprail1lands, Broadway roadway crossing of Dad Clark <br />Gulch in Douglas County, Colorado. <br />