WHITE CLAY CREEK PROJECTS
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White Clay Creek Finite Element Model
A finite element model for the entire lower White Clay Creek. The model extends the previously created model developed in prior studies by our firm for the western end of the area known as the Stanton Industrial Park. Boundary conditions are for the FEMA 100-year water flows and elevations.

Delaware Park White Clay Creek Stream Restoration
Professional engineering services for the design of stream restoration measures along the White Clay Creek and Mill Creek, a tributary to the White Clay Creek, within Delaware Park. Duffield Associates designed, permitted and provided construction review for the project. The goal of the design effort was to provide stream restoration including, but not limited to: identification and selection of an appropriate streambank restoration site, bank grading, installing bank mattresses, toe-of-bank reinforcement, planting vegetation of exposed areas, vanes, and weirs or other stream structures deemed suitable for chosen restoration sites.

United Water Sampling/Analysis of White Clay Creek
The Delaware River Basin Commission requested that United Water conduct an instream flow study and develop a new operating plan which addressed instream flow needs. Gathered field data on the fauna of the creek below the tidal capture structure (TCS). The data was to reflect an extreme worst case flow condition and was compared to data taken during more normal flow conditions to help predict flow reduction environmental impacts.

White Clay Creek Dam Breach
A study to review and evaluate potential options for stabilizing the area at the dam breach across from the City's water intake structure that occurred due to high flow events on the White Clay Creek. The creek has over-topped the riprap that was placed along the bank as an emergency measure and compromised the repair work that was previously done.

White Clay Creek Bread & Cheese Hydraulic Modeling
The study arose out of concern for flooding of multiple buildings located adjacent to White Clay Creek. The primary purpose of the study was to quantify expected flood levels and to evaluate the potential for mitigating flooding at these properties by means of a high flow bypass channel across Bread and Cheese Island.

Tidal Capture Structure
Developed a reliable method to withdraw 30 million gallon a day (MGD) raw water from the White Clay Creek at United Water Delaware's Stanton, Delaware Water Treatment Plant. Duffield Associates' team of engineers and scientists developed a unique solution to this challenge that involved the design of a water inflated bladder structure, which impounded the creek and prolonged the availability of water during the twice daily high tides. The project was permitted in record time and constructed within budget.

Medical Center Flood Proofing
Several major storms over the last five years have flooded the first floor of a medical building with flood waters ranging in depth from 15 inches to approximately 24 inches. Duffield Associates evaluated alternatives to prevent/mitigate damage from future flooding events on the adjacent White Clay Creek and prepared a floodproofing design for the project.

Newkirk Estates Flood Modeling and Mitigation
Retained by New Castle County to assess the extent of White Clay Creek flooding impacts on this community. A portion of the neighborhood was impacted by flood waters from recent hurricanes. Initially prepared flood mitigation concepts to reduce flood limits and, subsequently, prepared and executed models to assess the flood reduction resulting from these concepts.