1. Abstract
       Stratified-drift aquifers discontinuously underlie about 121
    square miles of the Contoocook River basin, which has a total
    drainage area of 776 square miles.  Maps showing water table,
    saturated thickness, and transmissivities were prepared from
    well and test hole data and from seismic-refraction profiles.
    This coverage contains the areas of different transmissiv-
    ities for the study area.
 
   Descriptors:
   Geohydrology, stratified drift, aquifers, New Hampshire,
   water table, saturated thickness, transmissivity, surficial
   geology, ground-water-site inventory, seismic refraction.
 
 2. Applications that use this data
 
   2.1  Intended use of data
           This data can be used to produce maps, illustrations,
        and performing a geographic analysis to assist in hydro-
        logic studies.
 
   2.2  Limitations of data
           Should not be used at larger scales than 1:24000.
 
 3.  Attribute discussion
 
        TMAX  -- The upper limit of the transmissivity zone, in
                 feet squared per day.
 
        TMIN  -- The lower limit of the transmissivity zone, in
                 feet squared per day.
 
        RANGE -- A single value that defines the transmissivty zone
                 (in feet squared per day). The following table explains
                 coding for the RANGE item.
 
 
               1 = 0
               2 = less than 500
               3 = 0 to 1000
               4 = 500 to 1000
               5 = 0 to 1500
               6 = greater than 1500
               7 = 0 to 2000
               8 = 1000 to 2000
               9 = 2000 to 3000
              10 = greater than 3000
              11 = 2000 to 4000
              12 = greater than 4000
              13 = 4000 to 6000
              14 = greater than 6000
              15 = 4000 t0 8000
              16 = greater than 8000
              98 = unable to contour transmissivity
              99 = unable to contour transmissivity
                   and saturated thickness
 
       For example a zone with a transmissivity greater than 8000 feet
       squared per day, has a TMAX of 99999, a TMIN of 8000, and range of
       16.
 
 
 4.  Procedures used to create or automate data
        Data digitized from mylar topographic maps using ARC/INFO
     software (5.0).  An RMS error no greater than 0.004 was used.
     Check plots were used to check line work.  Data was converted
     from 1927 datum to 1983 datum.  Water boundaries were taken from
     the USGS National Mapping Division (1:24000 or 1:25000, digital
     line graph data).
 
 5.  Revisions made to data
        Revision after colleague and editorial review
 
 6.  Reviews applied to data
        Data was reviewed by the USGS and the N.H. Dept of Environmental
     Services, Water Resources Division.
 
 7.  Related spatial and tabular data sets and programs
        Other data sets available from this study include, aquifer
     boundaries, saturated thickness, water table contours, wells, and
     siesmic lines.
 
 8.  References cited
     GEOHYDROLOGY AND WATER QUALITY OF STRATIFIED-DRIFT AQUIFERS IN
     THE CONTOOCOOK RIVER BASIN, SOUTH-CENTRAL NEW HAMPSHIRE
     by Philip T. Harte and William Johnson
     U.S. Geological Survey Water Resources Investigations Report
     92-4154
 
 9.  Notes
     The projection is as follows:
     PROJECTION STATE
     UNITS FEET
     DATUM NAD83
     ZONE 4676