Conference Agenda

Session 19B: Utility Management: Infrastructure Planning
Tuesday, 10/Sep/2019:
3:00pm - 4:30pm

Session Chair: Ann Hajnosz, Harris & Associates;
Location: D136

3:00pm - 3:45pm

Flowing through Options – What’s the Best Way to Extend Sewer to Future Development?

LaDonne Harris1, Skyler Allen2

1Murraysmith, Inc; 2City of Pocatello; ,

Bridging the gap between two municipalities and developers, regulators, engineers, and operators isn’t an easy task. Our approach to this Collection System Master Plan Amendment evaluated a multitude of feasible options and aimed to provide critical information to all required stakeholders.

Over the past decade, the City of Pocatello has experienced small amounts of growth. However, the City recently received plans for large development that will significantly increase the City’s service area and sewer infrastructure requirements. This presentation will describe the many options that should be considered in planning for such a significant change to the system, particularly one that spans significant foothills and elevation changes.

We will outline the proposed initial steps, all the way through the submittal of the final report, and the many options considered between those two bookends. Ultimately, the work included many conversations about feasible options—whether that be political, financial, or regulatory—that were then vetted through hydraulic modeling. Some options had enough data to propose routes all the way from the user to the wastewater treatment plant. Others had limited data that only provided a high-level evaluation of a potential service solution, and a few were ultimately given costs and moved forward. The City is now in a position to navigate the process of presenting the results to all interested parties and adapt as the reality diverges from the technical recommendations, which has already happened in at least one instance.

3:45pm - 4:30pm

Strategic Infrastructure Models for Water and Wastewater

Todd Helgeson, Kurt Vause, Haydn Reynolds

StreamlineAM, United States of America;

As utilities enter the age of replacement and begin to shift from development planning into replacement planning, a long-term replacement forecast becomes a crucial communication tool with stakeholders. Delaying needed replacements is an exercise in kicking the can down the road but many stakeholders do not see the forecast and understand that in most cases doing so compounds the problem in the future. Strategic Infrastructure models forecast these infrastructure needs long into the future (up to 100 years) based on utility data and practices. These forecasts can then be used to communicate the impacts of different funding and replacement scenarios.

This presentation will review Anchorage Water and Wastewater Utility’s effort at strategic Infrastructure modeling. In 2007, 2010, 2012/2013, and 2018 the Anchorage Water and Wastewater Utility prepared strategic asset renewal models for AWWU’s inventory of water/wastewater assets. Long-term replacement needs, wear out and repair estimates and anticipated changes in service levels over time were all produced as part of these efforts. We will review the data inputs and the changes in inputs over time, as well as reviewing the forecasts and forecast assumption over time.