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<br />---..-. --; -_.-------------_._--.~~-~.~.. <br /> <br />TABLE 2 <br /> <br />SUM}L\RY OF SOURCES OF GEOLOGIC INFORMATION USED FOR MAPPING AREAS OF PAST 'FLOODING <br /> <br />Source <br /> <br />Nature of Information <br /> <br />Commen,ts <br /> <br />Coverage of <br />Thesis Area <br /> <br />Confidence <br /> <br />Stream flow <br />data <br /> <br />Statistics on magnitude <br />and frequency of peak <br />flows <br /> <br />Stereo air <br />, photos' <br /> <br />Topography, sediments <br />and vegetation indica-. <br />tive of past flooding <br /> <br />Flood debris, high <br />W;3. ter ~arks" sediments, <br />etc. <br /> <br />~ield_observations <br /> <br />Surficial <br />geology maps <br /> <br />Alluvial deposits <br /> <br />Soil maps <br /> <br />Alluvial soils <br /> <br />Early date <br />topographic <br />maps <br /> <br />Eye\<.Titness <br />reports <br /> <br />Presence of stream <br />channels <br /> <br />Extent, magnitud~ <br />and frequel)cy <br /> <br />Absent within <br />thesis area <br /> <br />best <br /> <br />Available just out- <br />side of thesis area, <br />application strictly <br />limited <br /> <br />Best information, <br />. most useful available <br /> <br />Impractical due to' <br />size and nature of <br />area <br /> <br />Used on portions of <br />some rivers and <br />{3treams <br /> <br />Useful where 3ir <br />photo evidence was <br />difficult <br /> <br />Useful where air <br />photo evidence was <br />difficult <br /> <br />Especially helpful <br />in difficult <br />areas <br /> <br />100% coverage <br />" <br /> <br />very <br />good <br /> <br />Can be made <br />whe:r;-e necessary <br /> <br />vf!ry <br />good <br /> <br />Limited-l/3 of <br />area <br /> <br />fair <br /> <br />100% coverage <br /> <br />fair <br /> <br />Liniited":"1/2 of <br />area <br /> <br />good <br /> <br />Can be obtained <br />where nec~ssary <br /> <br />very <br />good, <br /> <br />f-' <br />o <br />