GWSI Sites

Purpose and intended use: This dataset is used by parties both internal and external to the agency, such as well owners, researchers, and the general public. Data creation methodologies, processing, and quality: The dataset has a unique GWSI SITE ID that is differentiated into a hierarchical Well Type that first assigns "Automated", then "Index", then "GWSI" category. Latitude and longitude are typically determined using handheld GPS equipment. Select sites, including all ADWR Automated sites, have survey-grade GPS measurements. Occasionally legacy sites will have their position determined by other methods, such as using topographic maps or aerial imagery. Permission to access and measure wells is entirely voluntary for the well owners. As such, the dataset does not represent all wells in the state and there may be large areas with sparse data coverage. Additionally, sites sourced from other agencies may have location data that was supplied by that agency, not ADWR-sourced data. The remaining attributes are used to populate well data shown on the water level hydrographs. Currency: This SDE Feature Class is updated daily with new data synced from ADWRs business database. Contact: Please use [this form] to contact the ADWR Hydrology Division with any questions. Use limitations: – Please refer to [ADWR Data Disclaimer]. Attributes: LOCAL ID: This is a 20 character-long site location based on the U. S. Bureau of Land Management’s system of land subdivision. It is also commonly referred to as a site’s cadastral location. See the GWSI Database Handbook (linked in the Information button) for more details about how this field is determined. REG ID: This field contains the State Well Registration (55-) number of the well if the site can be positively matched to a registered well. The 55-number is matched with a GWSI well only when the field investigator is absolutely certain that the wells are the same. WELL TYPE: Indicates the well type at the site. Automated sites are those which have automatic measuring equipment installed. They typically have at least one measurement taken per day. Index sites have discrete measurements at a set frequency – as often as monthly, no less frequently than annually. All other sites are GWSI sites. These are measured infrequently and not on any specific schedule. DD LAT: The best available value for the latitude of the site in decimal degrees. The position of the site is typically measured in the field by global positioning system (GPS) equipment. Latitude is listed using the NAD27 horizontal datum. DD LONG: The best available value for the longitude of the site in decimal degrees. The position of the site is typically measured in the field by global positioning system (GPS) equipment. Longitude is listed using the NAD27 horizontal datum. LAT NAD27: The best available value for the latitude of the site in degrees, minutes, and seconds. Latitude is listed using the NAD27 horizontal datum. LONG NAD27: The best available value for the longitude of the site in degrees, minutes, and seconds. Longitude is listed using the NAD27 horizontal datum. WELL ELEV: This field contains the altitude of land surface at the site in feet above datum. GWSI uses the National Geodetic Vertical Datum of 1929 (NGVD 29). WATER USE: Indicates to what purpose any water withdrawn from the site is used. See the GWSI Database Handbook (linked in the Information button) for more details about how each Water Use is defined. WELL DEPTH: This field contains the depth of the finished, or cased, portion of the well in feet below land surface. The depth of the well is usually taken from the completed well drillers report. CASE DIAM: Diameter of the well’s casing given in inches WL COUNT: Count of water level measurements taken at the site WL DTW: This field records the depth to water in feet below land surface. If the water level is above land surface, the water level is entered in feet above land surface preceded by a minus sign (-). WL ELEV: This field contains the elevation of the water table above vertical datum. This field is calculated by subtracting the depth to water from the well altitude as entered in the GWSI_SITES table. Except for flowing wells, water level elevations are blank for records that have no depth to water measurements. IDXBK: If the site is an active index well, the number of the index book it belongs to is entered in this field. Wells that have been removed from the index line are noted with “BK00”. Index lines are a good place to start when looking for long-term water level records. A well that has been removed from the index line may still contain a useful water level history. DRILL DATE: Date that construction of the well was completed. This is usually taken from submitted driller’s reports. LAST WL DATE: Date on which the last water level measurement was collected. QUASI INDEX WELL: This field documents whether an index well meets the criteria to monitor a specific aquifer category, such as an aquifer or hydrogeologic unit. Current index wells that do not meet all the criteria, in their entirety, to monitor a specific aquifer category and/or are used to monitor specified conditions in the area will be designated as quasi-index wells. Though a quasi-index well does not meet the objectives for aquifer category monitoring, there may be other purposes for monitoring such as measuring the effects of artificial recharge or pumpage, regulatory or statute driven monitoring requirements, etc. GOES ENABLES: Indicates if an ADWR automated site is telemetry-enabled. If yes, the field contains a “Y”. If not, it contains an “N”. Sites that are not automated do not have values in this field. TRANSDUCER ACTIVE: This field indicates if a site is a currently active ADWR transducer site. Sites with code Y are active transducer sites and N are inactive former transducer sites. If this field is null, the site has never been equipped with an ADWR transducer. Spatial Reference: The Feature class is projected to NAD 83 UTM ZONE 12N, however the location values listed in the attribute table are stored in NAD 27.