These are concurrent tracks – you’ll able to choose which track you want to attend on the day of the event.
By: Carol Hufnagel, Natl Wet Weather Practice Leader, Tetra Tech
Additional Authors: Scott Schmoker
The City of Omaha’s LTCP Update identified five green infrastructure pilot projects in the combined sewer service area. The Field Club Trail (FCT) Green Infrastructure Project is one of these five pilot projects, and will help manage stormwater that is tributary to the Ohern/Monroe combined sewer system. The current Field Club Trail project concept includes six subsurface and surface practices that will help manage stormwater from over 150 acres adjacent to the trail.
In 2015, the first of these practices was designed and constructed south of Vinton Street. The Vinton Green Infrastructure practice is a subsurface chamber that is designed to manage runoff from 8.3 acres of tributary area. It provides approximately 0.77 acre feet (0.25MG) of storage. The practice provides detention and opportunity for infiltration, reducing the amount of stormwater to the combined sewer system. It consists of a series of open bottom arches that are intended to promote infiltration.
This presentation will provide an overview of the concept, design issues and construction of the Vinton practice including technology evaluation, hydraulic considerations and flow management. An overview of the preliminary Field Club Trail concept will also be provided.
By: Brian Williams, Stormwater Products Specialist, ASP Enterprises, Inc.
Additional Authors: Bill Murphy, PE
One cost effective LID technique finding acceptance is the use of pervious pavement systems. Not only do they allow for peak flow reduction and infiltration but also cost reductions by dropping the required number of storm water inlets and associated drainage infrastructure.
We propose a presentation highlighting the benefits of infiltration, retention, detention and conveyance of a Permeable Articulating Concrete Block Mat (P-ACB/M) system used on a number of projects in the greater Omaha area.
The intent will be to look at the cost, design process and installation details on various projects as well as addressing maintenance issues that are inherent with the system.
By: Jason Garder, Environmental Engineer, CDM Smith
Additional Authors: Adam Wilmes
Green infrastructure is being implemented in many cities to manage combined sewer overflows (CSOs). The benefit of green infrastructure, one of many forms of low impact development (LID), in urban areas to control the “first flush” of runoff has been widely discussed and demonstrated. This first flush, which is approximately the first 0.5 inches of runoff, represents the most frequent events that regulated long term control plans must meet for CSO control. In addition, these frequent rainfall events also produce the majority of pollutants in stormwater runoff. Therefore, green infrastructure is typically designed to control these most frequent events.
Typically, the primary objective for CSO projects is to improve the quality of the receiving water body by removing stormwater volume from the combined system. Often, the most beneficial solution includes LID designs which mimic pre-development hydrology. Incorporating these features within the existing urban developments can pose major challenges throughout the design and construction process.
This presentation will discuss the design and construction of a large, centralized green infrastructure facility in Omaha, NE. The project began with a comprehensive evaluation of potential green infrastructure and LID solutions during preliminary design. A large centralized wetland detention basin was selected as the alternative that provided the most economical, environmental, and social benefits. This presentation will summarize the design criteria, watershed characteristics, water quality benefits, and community needs. The presentation will also discuss the construction process and challenges, which included significant site grading, inlet and outlet construction, landscaping, vegetation establishment, and maintenance.