American Water Resources Association

Student Poster Presentations

14 March 2018

Delaware River Watershed Initiative: Pennypack Creek, Horsham, PA

Wessam Mohammed, Villanova University, Villanova, PA

Abstract: Uncontrolled stormwater is the major cause of stream degradation in developed areas. Stormwater control measures (SCMs) seek to control stormwater by mimicking natural processes to restore the hydrologic cycle that was disrupted by development. A three-celled rain garden/wetland system was constructed to improve the water quality and control the quantity of water entering the headwaters of the Pennypack Creek. This feature was constructed on the College Settlement Camp Site in Horsham, PA. This SCM is designed to manage a 2-inch storm from a 55-acre drainage area with 26% impervious area and 1.3% surface slope. As part of their work with the Delaware River Watershed Initiative (DRWI), Villanova University is monitoring the effectiveness of this SCM. The site is instrumented with a weather station, bubblers to measure the basins’ water level, and a weir to measure outflow. A Stormwater Management Model (SWMM) model has been calibrated to the measured outflows to estimate the inflows since measuring the inflow to this SCM is difficult because there are multiple sources. A combination of grab samples and composite samples are collected from the basins, outflow, and downstream pond during the dry and storm events. These samples are analyzed for total suspended solids (TSS), total dissolved solids (TDS), nitrogen, and phosphorus. Preliminary results indicate that the SCM is retaining 58% of the flow volume.  In addition, a significant reduction in TSS and Nitrite concentrations was observed during dry times.

14 February 2018

Modeling hydrology into and around Green Infrastructure using GIS

Humaira Jahangiri, Villanova University, Villanova, PA

Abstract: The objective of the proposed research is to model volume reduction green infrastructure (GI) practices at a very fine scale. GI are a solution to highly urbanized communities, allowing them to reduce stormwater flow volumes and mitigate pollutants. This research models stormwater drainage networks (containing traditional and GI stormwater systems). This allows for hydrologic comparison between GI and stormwater infrastructure with hard designs. The modeling is done in ArcGIS, a geospatial data model used for delineating the flow accumulation lines and urban catchments using the Spatial Analyst tool. The input data for this model is a uniquely fine scale. The digital elevation model (DEM) was produced using LiDAR. The preprocessing of DEM to delineate watersheds was accomplished using the different ArcHydro tools. The water is forced to drain by altering the DEM to represent green infrastructure, buildings, gutters and inlets. Precipitation data collected onsite by Villanova Urban Stormwater Partnership (VUSP) is being used model a range of different storms to the GI capture, function and response. The model will be tested against other hydrologic parameters collected by VUSP at the study site; such stormwater pipe flow data. The gained understanding of the role of GI in a stormwater network from this project will contribute to improved stormwater management - helping to mitigate floods and improve downstream urban water quality.

8 November 2017

Rain Gardens, Runoff and Resilience: Creating the Next Generation of Stormwater Systems

Cara Melissa Albright, Villanova University, Villanova, PA

Abstract: The field of stormwater management has changed dramatically over the last two decades, moving away from a singular vision of flood control and extreme events to that of a more sustainable view of combining runoff quality and quantity and designing across a range of events. As part of this shift, we have moved from detention basins and conveyances to incorporating green infrastructure (GI) in the form of wetlands, pervious pavement, tree trenches, green roofs and rain gardens. While progress has been made, our knowledge of the performance of GI is still evolving. Part of this research is to develop a more holistic approach to design and implementation, which would consider hydrologic, geotechnical, environmental and economic constraints. Additionally, we are focused on utilizing both the infiltration and evapotranspiration (ET) capabilities of GI, depending on the goals and needs of a specific location. We are learning that our current practices underestimate GI performance on a volume capture basis, and fail to optimize the full capabilities of GI with respect to urban hydrology. Two bioinfiltration rain garden hydraulically connected in series, have been instrumented to assess current GI design performance and make recommendations for the next generation of GI systems. These rain gardens run parallel to Girard Avenue in the right-of-way near the Philadelphia Zoo. The site was initially instrumented in 2013 by the Philadelphia Water Department (PWD) to monitor water level. Working with PWD, Villanova further instrumented the site in 2015 to include meteorological measurements, soil moisture sensors, and more extensive water level monitoring. Results from the initial period of monitoring clearly show that these sites outperform expectations, confirming earlier studies at Villanova University and in Philadelphia. Research continues, with the goal of enhancing our understanding of urban hydrologic processes to drive the next generation of designs. This work will include comparing site performance to models of surface and vadose zone hydrology. Our research clearly shows that in order to take advantage of the full potential of GI, we must treat it as a system that integrates climate and surroundings in our designs. Doing so will allow us to set and achieve benchmarks that will maximize the potential of GI and integrate it with broader concepts such as risk, resilience and sustainable communities.

18 October 2017

Flood Management Nature-Based Solutions for Kampen, The Netherlands

Megan Cullison and Iman Elkhashab, Widener University, Chester, PA

Abstract: The city of Kampen in the Netherlands is struggling to combat flooding issues in the low-income neighborhood of Brunnepe. There is a necessity for the solutions to be nature-based, or “green” and be able to create community investment. Cost and practicality is also considered while researching. Site selection was done using resources provided by the City of Kampen, and was based off of storm water accumulation GIS. Large scale projects recommended were a Bio-swale playground and water retention pond. Smaller scale recommendations were a community garden, rain barrels, and flow through planters

Powered by Wild Apricot Membership Software