Description: This dataset is a subset of a larger dataset of NYS aquifers. Just the unconfined aquifers with flow rates of >10 gal/min are included, as per NYS DEC's definition of principal aquifers. The data set consists of aquifer polygons or regions depicting unconsolidated aquifers in New York State, excluding Long Island. Aquifers are separated by and include attributes for potential yield ranges and confinement indicator. Source: https://gis.ny.gov/gisdata/inventories/details.cfm?DSID=1141This (Main) is a component of the overall Unconsolidated Aquifer dataset (Main, Confined and Citation Block).Four types of aquifers with known water yield conditions were mapped. These include: 1a. UNCONFINED AQUIFER, 10 TO 100 GALLONS PER MINUTE - Sand and gravel with saturated zone generally less than 10 ft thick. Thicker deposits with less permeable silty sand and gravel may also be included. Yields in areas adjacent to streams may exceed 100 gal/min through pumping-induced infiltration, but these areas are too small to show at 1:250,000 scale. 1b. UNCONFINED AQUIFER, MORE THAN 100 GALLONS PER MINUTE - Sand and gravel of high transmisivity with saturated thickness greater than 10 ft. Many such areas are associated with a surface water source that can provide pumping-induced recharge. 2a. CONFINED, with overlying surficial aquifer. The underlying aquifer of sand and gravel is separated from the overlying aquifer by a layer of relatively impermeable till, very fine sand, silt or clay. They may produce from 5 to more than 500 gallons per minute. Confined aquifers are stored in a separate layer (Unconsolidated Confined) for ease of use. 2b. CONFINED, without overlying surficial aquifer. The underlying aquifer of sand and gravel is separated from the land surface by a layer of relatively impermeable till, very fine sand, silt or clay. It may produce from 5 to more than 500 gallons per minute. 3. AQUIFERS OF UNKNOWN POTENTIAL were also mapped. These include areas of sand, or sand and gravel for which little to no well data are on file to determine yield potential. Letter symbols, explained in the attribute table, indicate the type of deposit. 4. PRIMARY WATER-SUPPLY AQUIFER REGIONS were mapped. These regions include aquifers that are highly productive and are being used as sources of drinking water by major public supply systems. The aquifers in these areas were mapped at the 1:24,000 scale by the USGS and included in separate map reports. Further, these fine scale studies were represented as citation blocks on the 1:250000 scale unconsolidated aquifer maps. These blocks are a part of this digitized layer. These regions replace the previous "Primary Aquifers" layer, as this digitization is of higher quality. The individual 1:24,000 report layers are in the process of being published as digital files by USGS.
Copyright Text: 1. The NYS DEC asks to be credited in derived products. 2. Secondary Distribution of the data is not allowed. 3. Any documentation provided is an integral part of the data set. Failure to use the documentation in conjunction with the digital data constitutes misuse of the data. 4. Although every effort has been made to ensure the accuracy of information, errors may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions.