Session Three – 2:00 PM

30 Minute Tracks

These are concurrent tracks – you’ll able to choose which track you want to attend on the day of the event.

Research Track

Policy, Education, Technology Track

Applied LID Track

Using Fly Ash in Bioretention Cells to Remove Phosphorous from Stormwater

By: Glenn Brown, Regents Professor, Oklahoma State University
Additional Authors: Jason R. Vogel, Daniel Storm

Two USEPA 319(h) funded projects, administrated by the Oklahoma Conservation Commission and the Oklahoma Secretary of the Environment, have designed, constructed and quantified the long-term performance of fly ash amended bioretention cells built in 2007. The filter media consisted of a sand and Class C fly ash mix. Class C fly ash, a byproduct of coal fueled electrical power plants, contains significant amounts of the metal oxides CaO, Al2O3, and Fe2O4. Those oxides will react with phosphorous and heavy metals to form relativity insoluble minerals, thus reducing the pollutant concentration in the effluent. Analysis has included RCRA screening, laboratory batch sorption and column experiments, 3-D flow and transport modeling, construction sampling, field hydraulic testing, and core and water sampling after seven years. Cores samples have been subject to total acid digestion, water extraction, Mehlich 3 extraction and X-ray absorption near edge structure analysis (XANES). In addition, column testing of core samples have shown the fly ash media reduced effluent bacteria more than pure sand. Results of this work suggest that, with minor qualifications, fly ash should be given strong consideration for expanded use in stormwater filters. Considering its relatively low cost, fly ash has the potential to significantly reduce effluent contaminant concentrations from stormwater filters.

Promote Low Impact Development through Integrating Complex Environmental Data and Citizen Science with Mobile Information Platform

By: Zhenghong Tang, Associate Professor, University of Nebraska-Lincoln

Many people still have lower awareness on the concept of low impact development. While the dominating information channel is quickly moving to the mobile platform, an obvious gap still exists between the complex scientific environmental datasets and citizen usage. Stakeholders and citizens have to rely on specific equipment to access the geospatial environmental data in the field, such as the Soil Survey Geographic database, Flood Insurance Rate map, National Wetland Inventory, water quality dataset. More importantly, citizens have limited opportunities to send the volunteered geographic information to the environmental managers. Most of the environmental datasets are still in one-way top-down communication style. This study aims to evaluate the major pioneering, scientific-based, environmental-oriented, mobile information platforms in the United States and identify the strengths, weaknesses, opportunities, and threats of each project. This study analyzes the pioneering mobile information platforms – CoCoRaHS, What’s Invasive!, OakMapper, Field Photo, Leafsnap, U.S. Green Infrastructure Reporter, and Nebraska Wetlands. The results indicate that the long-term active users are the essential contributors to the environmental information. The motivation is key challenge and the data quality verification is a difficult task in citizen science projects. Successful online mobile information platform are well engaged with the off-line activities and professional network. The power of social media and network should be expanded to promote the mobile information platform. The findings of this study provide insightful recommendations to engage citizen involvement in low impact development research and projects.

Can working together result in better designs for LID projects?

By: Steven Apfelbaum, Senior Ecologist, Board Chairman/Founder, Applied Ecological Services, Inc.

Most professionals involved in the design field work within their professional services areas either alone or with another individual or two within their field. Engineers routinely work with engineers; landscape architects work with landscape architects; architects work with architects. During a conventional design team process, the co-mingling of ideas primarily occurs during design team meetings. But, this conventional design process typically takes more time, can contribute to narrowly focused and often single purpose focused design thinking within a discipline that then require reconciliation across the disciplines involved in a design process. This talk presents the logic and experience working together, across disciplines from the very beginning to frame LID projects where innovation and the solution integration benefits can be greatly enhanced through team work.