Karegnondi Water Authority, Michigan: Intermediate Pump Station

Check out how Jones & Henry designed an Intermediate Pump Station to receive raw water, provide storage to balance the flow between two pump stations, and re-pump raw water to a new water treatment plant.

Posted on: February 15, 2018

Jones & Henry was part of a $400 million project to design and construct a raw water supply system that would pump water from Lake Huron to several communities in Michigan.

Project Overview

The project consisted of an intake and pump station on Lake Huron, 130 miles of 66-inch and 60-inch pipeline, an intermediate pump station, an above-ground 700-million gallon reservoir, and two electrical substations at each of the pump stations.

In order to expedite the project, eight different engineering firms participated in the design and construction (oversight) of the project.

Ultimately, Jones & Henry was responsible for the design and construction representation of the Intermediate Pump Station (IPS).

Elements of the IPS design included:

  • Backpressure sustaining device
  • One 7.0 million-gallon ground storage tank
  • Four pumps, each 1,500 horsepower
  • Four 36-inch cone valves
  • Groundwater supply well
  • Leach field
  • Storm water detention basin
  • Electrical substation
  • SCADA System
  • Backup generator

IPS Goals

The primary objective of the IPS is to receive raw water being pumped by the Lake Huron Pump Station, provide storage to balance the flow between the two stations, and repump the raw water to the Genesee County Water Treatment Plant (WTP).

To achieve these goals, the design included:

  • A seven-million gallon ground pre-stressed concrete storage tank
  • A pump station capable of delivering 50.0 million gallons per day to the 700-million gallon reservoir which is located at the WTP

IPS Design

The IPS is a fully automated pump station designed to deliver 25.0 million gallons per day with one pump in operation and 50.0 million gallons per day with three pumps in operation (16.67 million gallons per day each).

Main design details include:

  • Operating Conditions: 25.0 million gallons per day with a total dynamic head of 205 feet and 16.67 million gallons per day with a total dynamic head of 286 feet
  • Motors’ Capacity: 1,500 horsepower each
  • Discharge Line & Cone Valves: The discharge line from each pump is equipped with cone valves, which are furnished with a hydropneumatic system to close the valves in case of a sudden loss of power
  • Electrical Substation: Provides power to the four 1,500-horsepower medium voltage pump and motors and provides electrical services at 4,160 volts to the Intermediate Pump Station
  • 480-Volt / 350-Kilowatt Generator: Used as standby power to shut down the pumps and to provide a low voltage power supply for the IPS maintenance and security
  • Hydraulically-Operated, Pilot-Controlled Electronic Control Valves: Designed to maintain a back pressure on the transmission main delivering raw water to the IPS
  • Chlorine Feed System: Provides control of biological activity within the raw water transmission main from the IPS to the Genesee County WTP
  • 36-Inch Bypass Line and Valve System: In case of emergency, this system will allow a limited by-pass flow from the Lake Huron Pump Station, around the IPS, directly to the water treatment plant

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