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, . . " . . " ... " , " . Flood fringe Floodway Flood fringe Floodplain able for all areas of the country and for many specific sites. The accompanying matrix identifies relevant agen- cies and notes the flood-related data that each agency is usually able to provide. In cases where agencies cannot provide the infor- mation or where existing reports do not include a par- ticular site, hydrologic specialists can develop the re- quired information through site-specific surveys. Some large design firms have staff engineers capable of com- pleting hydrologic studies, or such specialists can be re- tained as consultants for specific projects as required. Data concerning hydrologic conditions at the pro- posed site should include the following elements. Flood Hazard Boundaries. Boundaries for the dif- ferent degrees and types of flooding, including flood- ways, floodway fringe, coastal high hazard areas, coastal fringe, and shallow flooding areas, must be identified. Flood hazard boundaries are most significant because they determine the specific flood hazard zones that are part of a proposed development site or that will influ- ence development on the site. In addition, boundaries indicate where floodplain management regulations and flood insurance requirements apply to the site. Flood hazard boundary data can be obtained from floodplain maps or be developed from topographic maps, zoning , , ' . ',:,::~~i;1~~~~4~l_~ . ",:~(.;.t.'t..~:.:;!:,\t#f~t.~::.t .....n.,.,......>J:_~..~.:-~....:..', .1 '. '....: . ~~~~~.~~~~~~~~: . ~ ,~\'t......~.lf"~ <;i!t~lt:. . 't'!..~1...r./:\;:':::~..t ~ . ': ,;i.fJ~;~i1~f;}\\ . .. Coastal fringe Coastal high hazard area Ocean Floodplain 1be regulatory floodplain consists of two compo- nents. The riverine flood- plain (lift) consists of the floodway and the flood fringe. Corresponding des- ignations for the coastal floodplain (right) are the coastal high hazard area and the coastai fringe 41