Aquifers (Feature Service)

MassGIS produced an aquifer datalayer composed of 20 individual panels, generally based on the boundaries of the major drainage basins. Areas of high, medium and low yield were mapped. Aquifer polygons were not delineated for Cape Cod and the Elizabeth Islands. These areas in their entirety are considered by the Massachusetts Contingency Plan (MCP) as medium yield aquifers. The areas of Martha's Vineyard and Nantucket not delineated as high yield aquifers are also considered as medium yield under the MCP. The USGS 1:48,000 hydrologic atlas series on groundwater favorability was produced for all of Massachusetts. The basemaps for these were photographically reduced and spliced together from 1:24,000 USGS quadrangles. Each manuscript covers one of the major drainage basins. They have been individually researched and published by the USGS-WRD starting in the 1960s and continuing to the present. Several have been compiled but not yet published. In these cases the draft manuscripts were automated. The definition of high and medium yield varies between panels, as it does on the source manuscripts. While the medium yield for most basins is between 100 and 300 gpm (gallons per minute), this range may vary greatly from basin to basin. High yield definitions vary from basin to basin as well. More details... Map service also available. Also see the Non Potential Drinking Water Source Areas service.马萨诸塞州地理信息系统（Massachusetts Geographic Information System, MassGIS）制作了一套含水层数据层（aquifer datalayer），该数据集共包含20个独立分幅，其划分依据通常为主要流域的边界。本次工作已完成高、中、低产水能力区域的填绘。科德角（Cape Cod）与伊丽莎白群岛区域未绘制含水层多边形矢量面，马萨诸塞州应急计划（Massachusetts Contingency Plan, MCP）将上述整片区域均划定为中产水能力含水层。根据MCP规定，马撒葡萄园岛与楠塔基特岛中未被划定为高产水能力的区域，同样被归类为中产水能力含水层。 美国地质调查局（United States Geological Survey, USGS）针对马萨诸塞州全域编制了1:48000比例尺地下水适宜性水文图集系列，该图集的底图由1:24000比例尺USGS标准地形图幅经摄影缩小并拼接而成。每份图集分幅对应一个主要流域，自20世纪60年代起至今，美国地质调查局水资源部（USGS-WRD）已针对各分幅开展独立研究并发布成果。部分分幅虽已编制完成但尚未正式发布，此类情形下其手稿草稿已完成自动化处理。 与原始图集手稿一致，各分幅对高产、中产水能力的定义存在差异。尽管多数流域的中产水能力区间为100至300加仑/分钟（gallons per minute, gpm），但不同流域的该区间差异显著，高产水能力的定义同样因流域而异。更多详情……此外可获取地图服务，亦可参考《非潜在饮用水源区域》服务。