Data Elements for Ground-Water Sites

Date: Wed, 09 Sep 1998 09:42:11 -0400
From: Velvie E Stockdale 
Reply-To: "Velvie E Stockdale, Office Automation Assistant, Reston, VA" 
Organization: USGS
To: "  WRD Archive File,  "
CC: Velvie Stockdale 
Subject: OGW Technical Memorandum 98.02

NOTE:  The ^ that is throughout this document means to 
       superscript whatever follows, the numbers that 
       were supposed to be subscript could not be shown as such.




In Reply Refer To:                                  September 1, 1998
Mail Stop 411



OFFICE OF GROUND WATER TECHNICAL MEMORANDUM NO. 98.02

SUBJECT:  Data Elements for Ground-Water Sites

This memorandum describes Mandatory and Recommended data elements 
for ground-water sites in the Ground-Water Site Inventory (GWSI) 
for the purpose of standardizing the informational content of 
GWSI.  Entry of mandatory and recommended data elements into GWSI 
as described in this memorandum applies as of the date of this 
memorandum.  However, data elements designated as 'Planned' are 
scheduled for future releases of the National Water Information 
System (NWIS) and would be entered once these data elements can 
be populated in GWSI.

Background

Three categories of data are populated with ground-water site 
information in GWSI.  The first category consists of mandatory 
data elements.  Mandatory data elements are those that must be 
populated to establish a site in NWIS and to enable entry of 
other data into the system.  The second category consists of 
recommended data elements.  The minimum recommended data elements 
are those data elements in GWSI that provide additional basic 
information about a ground-water site.   Input of these elements 
is strongly recommended.  The third category consists of other 
data elements, which are all of the remaining data fields 
available in GWSI.  These data enhance the basic information 
about the site and are populated in GWSI to the extent available.


Mandatory and Recommended Categories

Mandatory data elements: Sixteen data elements for a ground-water 
site must be populated to establish a site in NWIS and to enable 
entry of other data into the system (table 1).


Table 1.  Mandatory ground-water data elements

[GWSI, Ground-Water Site Inventory; HUC, Hydrologic Unit Code; 
GMT, Greenwich Mean Time; GIS, Geographic Information System; The 
component number in GWSI associated with each data element is 
included for reference (Mathey, 1989)]

__________________________________________________________________

Mandatory data element (Component            Comment
 number in GWSI)
__________________________________________________________________

Source agency code (C4)

Site identification (C1)

Station name (C12)

Latitude (C9)

Longitude (C10)

Latitude and longitude accuracy (C11)

Horizontal datum (C36)                       Scheduled for NWIS 
                                             release 3_1.

Method of determining horizontal             Scheduled for NWIS
  datum (C35)                                release 3_1.

State (C7)

County (C8)

HUC (C20)                                    Not mandatory until 
                                             link to GIS becomes 
                                             available.

Station type (C802)

GMT offset (C813)

Data reliability (C3)

Site type (C2)

Use of site (C23)
__________________________________________________________________

Recommended data elements:  Fifteen data elements for a ground-
water site are strongly recommended for entry into GWSI (table 
2).  Some recommended data elements, if populated, also must 
include a subset of mandatory data elements associated with that 
recommended data element.  The recommended data elements are 
those that provide additional basic information about a ground-
water site: for example, owner of the well, information about the 
installation and construction of the well, information about 
subsurface geohydrologic units at the site, and water levels.



Table 2.  Recommended ground-water data elements and related 
mandatory and recommended subsets.

[GWSI, ground-water site inventory; The component number in GWSI 
associated with each data element is included for reference 
(Mathey, 1989)]
__________________________________________________________________

Recommended           Mandatory subset          Recommended subset
data element          (Component number in      (Component number
(Component            GWSI)                     in GWSI)
number in GWSI) 
__________________________________________________________________

                                SITE FILE

Project code (C5)     

Altitude of site      Date altitude determined 
  (C16)                 (Planned) ^2
                      Altitude method (C17)
                      Altitude accuracy (C18)
                      Source of altitude 
                        (Planned) ^2
                      Altitude datum (C22) ^1

Date of inventory 
  (C711)

Use of water (C24)

Hole depth (C27)

Depth of well        Date measured or           Measurement accuracy
  (C28)                reported for any new       (Planned) ^2
                       record (Planned) ^2      Source of depth data
                                                  (C29)

                               CONSTRUCTION

Construction                                    Completion date
  data                                            (year/month) (C60)
                                                Method of construction 
                                                  (C65)
                                                Source of data (C64)

Hole data            Depth to the top of hole   Depth to bottom of hole
                       interval (C73)             interval (C74)
                                                Hole diameter (C75)
                                                Source of data 
                                                  (Planned) ^2

Casing data          Top of casing (C77)        Diameter (C79)
                                                Casing material (C80)
                                                Source of data 
                                                  (Planned) ^2

Openings data        Depth to top of interval   Depth to bottom of
                       (C83)                      interval (C84)
                     Type of opening (C85)      Source of data
                                                  (Planned) ^2

                               MISCELLANEOUS

Owner data           Owner name (C161)          Date of ownership 
                                                  (C159)

Logs data            Type of log (C199)         Flag that log exists in
  (includes                                       a separate data base,
  geologic and                                    with links to that
  geophysical                                     record (Planned) ^2
  logs)

                                 DISCHARGE

Discharge data       Discharge (C150)           Measurement accuracy
                     Measurement method           (Planned) ^2
                       (C152)                   Source of data (C151)
                     Date discharge measured 
                       (C148)
                     Type of discharge (C703)

                               GEOHYDROLOGY

Geohydrologic unit   Unit identifier or name    Contributing unit 
  data                 (C93)                      (C304) 
                                                Source of data 
                                                  (Planned) ^2

                               WATER LEVELS

Water-level data     Water level (C237)         Site status (C238)
                     Measurement method         Agency (Planned) ^2
                       (C239)                   Month and day measured
                     Water-level accuracy         (C235)
                       (C276)                   Time of measurement
                     Year of measurement          (C709)
                       (C235)
                     Source of water-level 
                       measurement (C244) ^1
                     Altitude of site (C16)
                     Date altitude determined 
                       (Planned) ^2
                     Altitude method (C17)
                     Altitude accuracy (C18)
                     Source of altitude 
                       (Planned) ^2
                     Altitude datum (C22) ^1
__________________________________________________________________
^1 Scheduled for NWIS release 3_1.
^2 Scheduled for a future NWIS release.


Reference Cited

Mathey, S.B. (editor), 1989, National Water Information System 
     Users Manual, Volume 2, Chapter 4, Ground-Water Site 
     Inventory System: U.S. Geological Survey Open-File Report 89-
     587, 227 p.



                                     /s/ K.J. Hollett for
                                     William M. Alley
                                     Chief, Office of Ground Water


Distribution:  A, B, FO, PO