Session Three – 1:00 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

Understanding the Relationship Between Urban Best Management Practices and Ecosystem Services

By: Kelsey McDonough, Kansas State University

Increasing attentiveness to climate change and the dependence of human life on natural resources has spurred awareness about the detrimental impacts of human activity on the environment. Ecosystem services, or the benefits that humans derive from ecosystems, have changed more in the past 50 years than in any other comparable period in human history (Carpenter et al., 2009).The dilemma of managing the trade-off between immediate human needs and maintaining the ability of the Earth to provide ecosystem services is considered to be one of the largest challenges of this century (Foley et al., 2005). The ecosystem service concept aims maximize the provision of services across an entire ecosystem to achieve overall ecosystem health through land management, policy, and economic decisions. The intent of this research was to improve such decisions by increasing the understanding about the relationship between urban best management practices and freshwater provision, erosion regulation, and flood regulation ecosystem services. Fifty-six land management scenarios with varying densities of BMP application were simulated using the Stormwater Management Model (SWMM). The ecosystem services resulting from these land management scenarios were quantified using indices developed by Logsdon and Chaubey (2013). Results demonstrate that the application of bioretention cells improve both freshwater provision and erosion regulation services immediately downstream from the implementation site, and an increase in erosion regulation services was observed at the greater watershed scale. There was no change in the provision of freshwater, erosion regulation, or flood regulation services observed by the application of green roofs or rain barrels at either scale of analysis.

Overcoming Design Waste with Clear Visualization of Green Infrastructure Design

By: Zach Sample, XP Solutions

The array of benefits which come from implementing Green Infrastructure (GI) have been proven in practice over the past two decades and are largely understood by the greater water resources community. Many have standardized the design and quantification of GI, with the conventional approach hinging principally on retention volume estimates (i.e. First Flush runoff volume) which can be calculated by hand or with a spreadsheet tool.

When looking at the design-build-maintain lifecycle, shortcomings or gaps in this conventional design approach can be seen to hold back the potential success of GI designs. Simplified catchment delineation, independently designed and isolated stormwater controls are the byproduct of this approach. Real world GI scenarios typically demand integrated, distributed GI systems which cannot be appropriately designed or implemented with conventional approaches. The ability to visualize the integrated and holistic approach could provide easily-created, easy-to-understand and cost-effective designs benefitting both designer and designed system.

This presentation will explore gaps in the conventional GI design process and how these problems can be solved by utilizing clear visualization workflows and tools throughout the design process. A case study will exhibit utilization of this workflow and show an immediate reduction in design waste by demonstrating the realistic connectivity of these treatment trains and how these can influence site planning and design. As a result of this clear visualization scheme, we are able to mitigate urban runoff and protect the water quality of the receiving waters in a way that is affordable now and in the future.

Utilizing Innovative Monitoring Techniques to Better Understand Green Infrastructure

By: Andy Sauer, Green Infrastucture and Stormwater Manager, Burns & McDonnell
Additional Authors: Mitch Klein, Burns & McDonnell

Green infrastructure monitoring provides essential data to understand the existing performance of GI and to develop more sustainable designs with lower maintenance costs in the future. In 2015, Burns & McDonnell developed a monitoring plan for five different types of bioretention cells in Omaha, Nebraska providing a range of information including data on the inflow and outflow rates of stormwater, infiltration rates into the soil, and pollutant removal rates. A range of methods and procedures for GI monitoring were considered to match the monitoring goals. Recommended monitoring quantified the stormwater inflow and outflow to estimate water quantity and water quality impacts to the downstream system as well as ponding depths and soil moisture measurements. This presentation will provide an overview of the various monitoring methods, equipment, and approaches that were utilized and the results of the installation of monitoring equipment to evaluate the performance of two types of bioretention. This presentation will present data on soil moisture monitoring at depths of up to 7 to 10 feet below and around a bioretention cell. This soil moisture data will for the first time provide monitoring data on water movement within subsurface soils. This monitoring data will provide insight into how bioretention preforms so designers can better understand water movement into and out of bioretention cells. Outcomes from this monitoring effort will be summarized including lessons learned and plans for future monitoring activities.

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