A.D. Marble is proud to have assisted in the hydrologic and hydraulic (H&H) studies for the replacement of the Lincoln Avenue bridge over the West Branch of Neshaminy Creek in the Borough of Hatfield.

Task:  Complete the hydrologic and hydraulic (H&H) analysis.

Challenge: The proximity of residential structures, in conjunction with the designated FEMA Zone AE with regulatory floodway. The waterway upstream of the Lincoln Avenue bridge was conveyed through a stream enclosure, and there was a split flow condition between the main stem and a side channel downstream of the bridge.

Results: The hydraulic opening of the Lincoln Avenue bridge was kept consistent between the existing and proposed conditions to avoid changing the distribution of flow in the main stem versus the side channel. In addition to meeting the floodway challenges, A.D. Marble worked with the structural and geotechnical engineers to identify an alternative scour protection measure due to the presence of shallow friable bedrock. Our experienced water resource engineers confidently met the challenge and easily navigated through the analysis and regulations.