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<br /> <br /> <br /> <br /> <br />Vegetation is an important <br />part of controlling water <br />runoff. It helps prevent ero- <br />sion and reduces the flow <br />of surface water on slopes <br />(top). It also stahilizes dune <br />composition in coastal <br />areas (center). and protects <br />wetland areas (bottom). <br /> <br />Water storage can he an <br />important aid in control- <br />ling water runoff. <br /> <br />48 <br /> <br />tions, footings, and pilings. Slope stability also Influences <br />erosion, which determines the need to use protective <br />techniques such as terracing, planting, or other forms of <br />ground cover. <br />Vegetation. Both existing and potential vegetation <br />on a proposed site affect the choice of flood damage <br />reduction strategies. Vegetation aids in the control of <br />storm water runoff and helps discourage erosion. Site <br />surveys carried out by design staff or consultants should <br />identify how existing vegetation is related to flooding <br />and how vegetation can be used in site development to <br />minimize flood-related losses. <br />Water Storage. Water storage, either temporary or <br />permanent, is another factor in controlling storm water <br />runoff. Storage devices can be used to hold excess <br />runoff until it can be released gradually into the <br />watershed system, thereby avoiding the rapid accumula- <br />tions that cause flooding. Additionally, stored water can <br />aid in recharging ground water levels and, in some in- <br />stances, provide environmental ameniw Site analysis <br />should identify where water collects on the site prior to <br />development, such as in natural surface depressions, <br />and should indicate how water can be detained after <br />development. This information can be obtained from <br />topographic maps, surface profiles, and site surveys. <br /> <br />Existing Development <br />Existing development at the site and in the surrounding <br />region also influences design in flood-prone areas. The <br />intensity and type of development adjacent to the pro- <br />posed site will influence the movement of water <br />through the hydrologic cycle, and thus influence flood- <br />ing at the site. With a high level of development intensity <br />in the region there is likely to be more surface runoff of <br /> <br />, <br />I I I i~ + t <br />I I I \' <br />, ., <br />, ' <br />" ' <br />, ' <br />