Under its data collection program, the Plymouth Saltwater Intrusion Task Force installed a datalogging transducer in a coastal Ellisville well located about 450 feet from the shoreline. The transducer measured water level, specific conductance (SC) and temperature. The plot below shows how tidal variations in Cape Cod Bay affect water levels in the well. The salinity (expressed as SC) was not affected by tidal variations. Groundwater quality shows low salinity and is not impaired relative to drinking water standards.

Malcolm Macgregor's powerpoint, Plymouth Aquifer Hiking, outlines several hikes that you can take to explore how the topography of Plymouth relates to three of Plymouth's watersheds: Eel River Watershed, Beaver Dam Brook Watershed, and Agawam River Watershed.

The Herring Lady is a beloved icon of this festival. Alas, I not manage to see her this year, which doesn't mean she wasn't there. Here she is in the outfit she created for the 2022 festival.

The major updates to the groundwater flow model are: (1) the grid for the groundwater flow model is finalized, and (2) a density-dependent model was run to represent the salinity distribution in the aquifer. In the zone most likely to experience saltwater intrusion (8 to -32 meters above sea level), the grid cells have a finer vertical spacing to detect precise changes in saltwater intrusion. In Figure 1, the interface between saltwater and freshwater can be seen near the coast, with more dense ocean water (red) flowing under the less dense freshwater (blue).

We developed a homogenous density-dependent groundwater model simulating groundwater flow in bedrock and overburden sediments. As seen in the image of the cross-sections, an interface forms between the more dense ocean water (red) and the less dense freshwater (blue). Also included is an image of the modeled hydraulic head; you can see that the hydraulic head decreases moving toward the coast (east). In this aquifer system, hydraulic head can be thought of as the elevation of the water table. We are now revising the stratigraphic framework for the region using state well logs which will be incorporated in future model simulations.