Hydrogeomorphic database field documentation 



Tocation r Fields dlat. dlona. mlat. mlona. slat and slonq) . 



Sampling locations are based upon Randy Apfelbeck's mapped 

 site locations indicated on 7.5 minute USGS topographic quadrangle 

 maps. In some cases sampling sites were marked on the topographic 

 maps in the field during sampling; in other cases the maps were not 

 used in the field, and locations were reconstructed later from 

 field notes. In most cases these map locations are believed to be 

 accurate to a tolerance of ±5 seconds latitude and longitude. At 

 some sampling sites along low-angle, transient shorelines, accuracy 

 may be less but probably is no worse than ±10 seconds latitude and 

 longitude. 



The translation of mapped sampling points to the 6-field DBase 

 locations was done manually using mylar overlays on the topographic 

 quadrangles. The overlay translation is believed to be precise 

 within ± 2 or 3 seconds of latitude and longitude. 



The Arclnfo point coverage of sample site locations is 

 generated from the manually translated dBase location fields and 

 carries the same accuracy and precision. 



Elevation (Field Site elU 



Site elevations (in feet above MSL) are derived from mapped 

 elevations of the sampled wetlands shown on 7 . 5 minute topographic 

 quadrangles. Visual interpolations of elevations between contour 

 intervals are made where appropriate. Accuracy of the interpolated 

 map elevations are dependent on map accuracy and contour intervals. 

 Elevations in the dBase field are not modified to account for 

 differences between water levels at the time of sampling and those 

 in the photobase for the topographic quadrangles. 



Maximum drainage basin elevation r Field basn maxK 



Maximum drainage basin elevations (in feet above MSL) were 

 determined manually from topographic mapping. For sample wetlands 

 with smaller drainage basins, basin maximum elevations were derived 

 from 7.5 minute topographic quadrangles with contour intervals of 

 40 feet or better. For some sites with large contributing basin 

 areas, maximum basin elevations were determined from small-scale 

 topographic maps with contour intervals as large as 200 feet. In 

 the case of wetland and lake basins with known substantial water 

 imports (such as Ninepipe Reservoir), the basin is taken to include 

 the areas contributing to source of the imports, and the drainage 

 basin maximum elevation reflects areas contributing imported water. 



