The goal of this project is to develop a three-dimensional (3D) numerical groundwater flow model to evaluate the potential impacts to surface- and groundwater resulting from the disposal of treated wastewater in a portion of the Inland Bays drainage basin. The work will be accomplished with in-house software (ArcGIS, Surfer, and Visual MODFlow).
By developing a sub-regional, fresh, groundwater flow model and analyzing results, several issues will be addressed that are related to state policy, regulation revision, and proposed projects associated with land-based wastewater disposal (LBWD) in Sussex County.
The study area is bounded on the south by Indian River, on the north by Herring Creek, on the east by Rehoboth Bay, and the west by Cow Bridge Branch, in eastern Sussex County, with an approximate area of 64 mi2. This area is of interest because it includes two existing large (> 1 MGD, Inland Bays and Mountaire) and one small (<50 KGD, Baywood Greens) spray irrigation facilities, and an existing large (>500 KGD), but underutilized (<20 KGD) rapid infiltration basin disposal site (Stonewater Creek). Water supply is largely served by individual domestic wells with additional spatially dispersed public and agricultural wells.
Research for this project was completed in late 2012. Conclusions are as follows:
We conducted a groundwater flow model around two major wastewater irrigation facilities