Keywords Surface runoff Average runoff Surface waters United States
Information contained in the runoff coverage has been used for several publications. The first is the 1985 National Water Summary (U.S. Geological Survey, 1986), which contained state by state maps (scales 1:3,000,000 to 1:7,500,000) as well as a national map of runoff. The second publication is HA-710 (Gebert and others, 1987).
Procedures_Used:
Data were compiled in 1985. Streamflow data were collected at over 12,000 gaging stations during 1951-80; 5,951 stations were selected for the analysis. See Gebert and others (1987) for a complete description of how the runoff was determined from the streamflow data.
The compilation material was digitized from stable base frosted mylar, using Lambert projection (National Atlas sectionals, 1:2,000,000 scale). Digitizing was completed in March 1987.
The digital material was projected to Albers using the following parameters:
First parallel: 29 30 00 N Second parallel: 45 30 00 N Central meridian: -96 00 00 W Latitude of projection origin: 23 00 00 N False easting: 0.0 False northing: 0.0
Digitizer units (inches) were transformed to Albers units (meters).
Revisions: Process_Step Procession_Description: Revision 1 Original version of coverage. Process_Date 1987
Reviews_Applied_to_Data: The digital material was checked and corrected for smoothness and accuracy and for reliable uses at scales up to 1:5,000,000.
The contours were reviewed during the preparation of the maps in the 1985 National Water Summary (U.S. Geological Survey, 1986) and the maps in HA-710 (Gebert and others, 1987).
Related_Spatial_and_Tabular_Data_Sets: None
Other_References_Cited: U.S. Geological Survey, 1986, National Water Summary 1985--Hydrologic events and surface-water resources: U.S. Geological Survey Water-Supply Paper 2300, 506 p.
Gebert, W.A., Graczyk, D.J., and Krug, W.R., 1987, Average annual runoff in the United States, 1951-80: U.S. Geological Survey Hydrologic Investigations Atlas HA-710, scale 1:7,500,000.
Notes:
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Continually Daily Weekly Monthly Annually Unknown As Needed Irregular None planned
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The digital data is more extensive than either publication (see above) portrays. Only contours with the following values are continuous (that is, no state line faults exist) and some of these contours were not printed if the data was too dense to fit at the publication scale:
1, 2, 5, 10, 15, 20, 25, 30, 40, 60, 80, 100, 120, 160
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(An explanation of the accuracy of the horizontal coordinate measurements and a description of tests used, if any, to determine horizontal positional accuracy. This is different from horizontal resolution as reported in the DOC file. Positional accuracy defines how correctly the digital features match real-world features and woiuld be related to the concept of the National Map Accuracy Standard -- xx% of well-defined point features fall within xx units of their true position. The resolution is the smallest unit of measure the GIS can reliably manage without truncation or rounding.)
(The same as above, but for vertical information that may be encoded with the 2-D features such as cell or contour estimates of a vertical dimension. A description of the contour interval of input data and its basis could be described here.)
The other attributes (DESIGN, DESIGN2, DESIGN3) were used in preparing cartographic products for HA-710.
10 ITEMS: STARTING IN POSITION 1 COL ITEM NAME WDTH OPUT TYP N.DEC ALTERNATE NAME 1 FNODE# 4 5 B - 5 TNODE# 4 5 B - 9 LPOLY# 4 5 B - 13 RPOLY# 4 5 B - 17 LENGTH 4 12 F 3 21 US_RUNOFF# 4 5 B - 25 US_RUNOFF-ID 4 5 B - 29 DESIGN 3 3 I - 32 DESIGN2 3 3 I - 35 INCHES 3 3 I - ** REDEFINED ITEMS ** 38 DESIGN3 3 3 I -