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STANDARDS FOR DIGITAL LINE GRAPHS FOR THE NATIONAL FLOOD INSURANCE PROGRAH ATTRIBUTE CODING FDA HYDROGRAPHY Node Attribute Codes None Area Attribute Codes Maj or Code 000 Minor Code 0000 DescriPtor Outside Area 430 Line Attribute Codes 430 430 10/93 02S0 0260 0261 Hydrography Bisec tor Cross Section Shown On DFIRM Computed Cross Section Not Shown On OFIRM Comments Each OLe provides a coherent description of that portion of the eart~~s surface covered by a 1:24,000-scale, 7.S-~inute eel]. To maintain topological consistency and to facilitate the combination (integration) of multiple OLes, the area outside the cell is specifically identified for each OLe. This area element, which must be the first area present in each data category, is assigned a single attribute code with major and minor codes both equal to zero. This code identifies the line bounding the area covered by a USGS 7.S-minute quadrangle. It is shown by FIS symbol L212. The area inside the neatline must have at least one centroid. This code identifies a field-surveyed line across a floodplain, as shown on the Flood Insurance Rate Map or Flood Boundary Floodway Map, at which computation of flood flow has been made to establish a potential flood elevation. This code is identified with a parameter code (433 xxyy) that is usually unique by stream. It is shown by FIS symbol L20S. This code identifies a field-surveyed line across a floodplain, not shown on the OFIRM but used for engineering analysis, at which computation of flood flow has been made to establish a potential flood elevation. This code is identified with a parameter code (433 xxyy) that is usually unique by stream. 31