Poquessing Creek Watershed & Stream Assessment


Philadelphia County, Philadelphia Water Department

AEG prepared the Poquessing Creek Watershed Stream Assessment Report for the Philadelphia Water Department. The Poquessing Creek and its tributaries are degraded from a combination of stormwater runoff and channel alterations from urbanization. AEG was hired to continue monitoring efforts in the watershed and compile a comprehensive report that summarized the stream conditions in the watershed and prioritized restoration efforts within the watershed. The stream studies conducted by AEG were a combination of field data collection and Geographic Information Systems (GIS) data assessment. The AEG team walked over 60 miles of stream channel to assess the condition of all perennial streams in the 20-square-mile watershed. The United Stream Assessment Methodology (USAM) was used to classify the condition of the in-stream habitat, floodplain condition, riparian buffer condition, and several other parameters throughout the watershed. Cross- section surveys, bankfull identification, and photographs were also collected at each stream reach for geomorphic classification. Interviews were conducted with watershed citizens to determine changes that have occurred in the watershed over time. AEG used GIS to develop watershed mapping, including soils, subwatershed, geology, infrastructure locations,streams reach, and several additional datasets. Hydrologic models and regression equations were used to calibrate stream cross-section bankfull flows. This included a review, analysis and critique of the Poquessing Creek Act 167 model flows and calibration. AEG used this updated information/data, in coordination with field-observed bankfull pamameters and cross-sections, to optimize bankfull predictions in the watershed. This information is being used to develop streambank erosion rates throughout the watershed. AEG compiled the Poquessing Creek Watershed Stream Assessment Report. This report included a comprehensive geomorphic characterization, stream condition survey, and infrastructure survey. The assessment will be used to develop recommendations and priorities for future restoration efforts.