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Case Studies > Washington County Conservancy District and St. George Water Services Department

Washington County Conservancy District and St. George Water Services Department

Technology Category
  • Functional Applications - Remote Monitoring & Control Systems
  • Networks & Connectivity - Network Management & Analysis Software
  • Networks & Connectivity - Wireless Local Area Network
Applicable Industries
  • Cities & Municipalities
  • Utilities
Applicable Functions
  • Facility Management
  • Maintenance
Use Cases
  • Predictive Maintenance
  • Remote Asset Management
  • Water Utility Management
Services
  • Hardware Design & Engineering Services
  • System Integration
The Challenge
St. George Water Services Department needed to collect reliable and accurate data from hundreds of I/O points scattered throughout a large and diverse topographical area. They identified that upgrading to a SCADA system would cover a wider area and provide a better overall network capable of transferring data in real time. The first issue was the protocol for transmitting data from one point to another. In the context of wireless M2M data communication, a network protocol is a formal set of rules, conventions, and data structures that govern how computers and other devices exchange information over a network. The 'backbone' is typically a wireless M2M communications technology to allow for many data items to be transmitted bi-directionally at the same time.
About The Customer
Washington County Water Conservancy District (WCWCD) is a non-profit public agency established in 1962 to manage Washington County’s water needs. WCWCD is responsible for reservoirs, pipelines, wells, water storage tanks, treatment plants, hydropower plants, and diversion dams located inside the district. Most of WCWCD water is sold at wholesale to the cities within the district. St. George is one of the cities that purchases water from WCWCD. The mission for the St. George Water Services Department is to effectively and efficiently manage and optimize the complete water cycle for the city of St. George.
The Solution
The St. George Water Services Department utilized FreeWave’s HT-Plus Ethernet spread spectrum radios for the core of their wireless M2M communications network. To minimize cost without sacrificing performance, the city designed a system using FreeWave’s cost-effective RGRIO and FGR series radios to handle single and low I/O data points using the ModBus protocol. These satellite cells were coupled together through a network of HT-Plus Ethernet radios to the Main Control PC that graphically displays the data and logs the important points at predetermined intervals. The HT-Plus radios have two serial ports that allow ‘back links’ for the serial data radios, enabling them to send data without converting it to an Ethernet protocol. The city also used PLCs (Programmable Logic Controllers) at control points and configured those PLCs to communicate through serial ports to ModBus devices using the FGR radios, before connecting to the backbone through TCP/IP ports.
Operational Impact
  • The St. George Water Services Department has a wireless M2M backbone system that is more than 100 linear miles in length, with branches covering many more miles.
  • The I/O count is in the thousands, with more than two hundred data sites.
  • The sites are a mix of utility-powered and solar-powered devices, with the solar sites designed to perform for several cloudy days without interruption of service.
Quantitative Benefit
  • The wireless M2M backbone system covers over 100 linear miles.
  • The system includes more than two hundred data sites.

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