2022 WATER & WASTEWATER AWARDS

The 2022 ACEC/Iowa Engineering Excellence Awards winning projects in the Water & Wastewater Category, in the order listed:

Water and Wastewater Grand Place Award  (1st Place in Category)

Firm: HR Green, Inc.
Client/Owner: Des Moines Metropolitan Wastewater Reclamation Authority
Project: WRA Eastside Interceptor

The Des Moines Metropolitan Wastewater Reclamation Authority (WRA) Interceptor Phase 27 Project (“Eastside Interceptor”) addressed known capacity deficiencies of the Westside Interceptors and increase the system’s capacity to effectively and efficiently convey the flow of wastewater for the Des Moines metro area for decades to come. There are eight major segments. Segments 1 through 5 encompassed a gravity interceptor sewer from Union Park, through the east side of Des Moines, to the Wastewater Reclamation Facility (WRF). Segments 6 and 7 encompassed a 42” diameter pressure force main from the Westside Pumping Station to the gravity sewer at Union Park. Segment 8 involved construction of a new High Flow Pump Station on the Westside Pump Station Property. HR Green provided design and construction phase services for Segments 6, 7, and 8 of the Eastside Interceptor project.
Force main design included nearly 8,500 LF of ductile iron pipe, including a crossing of the Des Moines River. The force main then traverses Birdland Park and is located adjacent to a US Army Corps of Engineers (USACE) flood protection levee prior to discharging at Union Park into gravity sewer.
Segment 8 of the project included modifications to the existing Westside Pumping Station and Equalization Basin. These modifications added 35-45 mgd of high flow pumping capacity, increasing total pumping capacity to 80 mgd. The High Flow Pump Station was retrofitted within the existing equalization basin configuration.
HR Green completed system curve hydraulic calculations for pump selection and transient analysis for the force main. A “dipping tube style” surge tank is located at the High Flow Pump Station, as well as strategically located air release devices along the force main to mitigate pressure fluctuations. Force main interconnection provisions are provided, allowing either the existing Westside Pump Station or new High Flow Pump Station to utilize the new or old force main. USACE approval was required for the High Flow Pump Station siting and force main designs. HR Green provided construction sequencing and planning, allowing construction to align with the large gravity interceptor design to convey the force main flows to the WRF.
WRA is very satisfied with the project and noted that HR Green’s advance planning and efforts kept project disruption at manageable and acceptable levels for businesses and residents impacted. The project provides reliable wastewater service to the Des Moines area for years to come.

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