Water / Flood Warning Systems (ALERT/ALERT2)

How We Can Help You

Campbell Scientific designs and builds standard Automated Local Evaluation in Real Time (ALERT), ALERT2, hybrid ALERT, and customised flood-warning systems. This includes a turn-key transmitter packaged in a traditional Event Reporting Radio Telemetry System (ERRTS) style canister for standpipe installation. The data loggers at the heart of our systems have been proven over decades in the harshest, most remote conditions. You can add our systems to an existing network of stations, or we can customise a system for your unique application.

For customers currently using legacy ALERT systems, Campbell Scientific can provide assistance in the transition to ALERT2.

Learn more

To see how our systems meet your application needs, review our case studies »

Customize a System

Most of the systems we sell are customized. Tell us what you need and we'll help you configure a system that meets your exact needs.

Automated weather station on Mount Everest

The Same Hardware Installed on Mount Everest

The Campbell Intercept™ CCT AWOS solution is based upon the same weather station hardware that is used to withstand the harshest of conditions on Mount Everest. The weather stations installed on Mount Everest are the highest in the world. Visit the Everest Project web pages to learn more.

Campbell Intercept™

Aviation INTERCEPT software

Campbell Scientific is proud to introduce our newest generation Automated Weather Observing System (AWOS) software, Campbell Intercept™. Campbell Intercept™ combines modern features and functionality with the flexibility and reliability desired by today’s airports. It has been designed to provide International Civil Aviation Organization (ICAO) and World Meteorological Organization (WMO) compliance within a flexible framework that is sensor agnostic, highly configurable, and can be modified to meet local in-country requirements.

Campbell Intercept™ provides web-based clients for many user profiles, including air traffic controllers, meteorological observers, maintenance personnel, and system administrators.

Campbell Intercept™ software can run on Windows or Linux-based operating systems. It has been designed to meet modern aviation stakeholder requirements related to security and software assurance.



We offer a variety of products that can be used to create systems for Flood Warning Systems (ALERT/ALERT2). Many of the major components used to create these systems are listed below. Please let us know if we can help you configure a system.

More Details about Our Flood Warning Systems (ALERT/ALERT2) Systems

ALERT System

Our ALERT systems match all standard ALERT protocols, including ALERT2. Our data loggers, proven in thousands of applications worldwide, provide multiple types of inputs (pulse, analog, SDI-12, and others), which allow you to use almost any type of water-level sensor (including pressure transducers, shaft encoders, bubblers, and ultrasonic distance sensors). The onboard algorithms are able to calculate hourly and daily minimums, maximums, averages, totals, flow, or any other statistical value. These values can be stored onboard the system, providing you with a backup of the data. A solar panel provides continuous charge to the battery for your extended, unattended monitoring needs.

If you need additional sensors to measure soil moisture, water quality, or meteorological conditions, it is easy to integrate them. We can upgrade older systems—even those from other manufacturers—with the latest data logger and transmitter, often allowing you to use the same sensors and standpipe or enclosure.

ALERT2 Systems

The added performance of ALERT2 systems makes them a logical choice for new systems and for upgrading existing networks. The main advantage is the ability to have larger networks and greatly reduced data loss. When you upgrade an older ALERT network to ALERT2, you don't have to update the complete system all at once. Rather, you can complete the upgrade in phases to ease the cost and labor burdens. All the other functions and features of the original ALERT systems are still available with ALERT2.

Campbell Scientific equipment has been used for some of the largest and most widely used ALERT2 networks in the country. For an example of the performance of these systems, read the "Texas: Transitioning to ALERT2" case study.

Note: ALERT2 is a trademark of the National Hydrologic Warning Council.

Hybrid ALERT Systems

Our hybrid systems consist of an ALERT system integrated with additional sensors and communications peripherals. One or two radio frequencies can be used, depending on your needs. With a single frequency, two-way communications are avoided during storm events to allow more bandwidth for one-way ALERT communications. You may, however, choose to use two frequencies: one for ALERT and the other for a fully functional, two-way communications network. This provides the following inherent advantages:

  • Retries of missed packets
  • Diagnostics
  • Clock synchronization
  • Re-programming from the base station
  • Historical data collection (no holes in the data)
  • Interactive control capability
  • Voice modem call-out of alarms

If you are able to measure additional parameters at your ALERT site, or to integrate ALERT capabilities with another type of measurement site, it may be easier for you to collaborate with another organization. Collaboration may help keep your costs down.

Customized Flood Warning Network Using LoggerNet Software

A flood warning network that uses LoggerNet software takes advantage of two-way RF communications and the latest in network management software. LoggerNet is a client/server software program used for managing large networks of monitoring stations. A LoggerNet-based system is a viable solution for flood warning applications for two reasons:

  1. The speed at which LoggerNet can poll multiple RF stations
  2. The speed and versatility with which LoggerNet can make the data available to multiple interested parties 

When a "send data" command is broadcast to a group of remote stations, the stations transmit predefined data to the LoggerNet server in their own time window. Transmission windows can be as short as 100 ms, allowing multiple sites to be polled per second. As the data is collected, LoggerNet clients access it from LANs or via the Internet, making the data available to multiple users or agencies in near real time.

Other Resources and Options

To meet your application's specific needs, you can combine other resources and communications options with flood warning systems. It is common for local governments to combine resources to obtain the best possible system. In other situations, federal agencies are involved, which increases system coverage and robustness, and even helps with the budget. For example, GOES satellite transmitters can be added to stations to provide automated data archival through the National Weather Service (NOAA/NESDIS) and the U.S. Geological Survey (USGS). Multiple-purpose data-collection systems bring to bear the resources and expertise of environmental data experts.

Case Studies

Africa: Flood Warning and Ecosystem Decisions
Note: This article was first published in the September 2020 issue of Meteorological Technology International......read more
Texas: Hurricane Harvey
In February of 2015, Campbell Scientific was awarded a bid to supply the Harris County......read more
Pennsylvania: Flood Warning
Flooding is the number one natural cause of fatalities worldwide and was responsible for 6.8......read more
Texas: Transitioning to ALERT2
ALERT2 is a modern communication protocol that improves upon 40 years of tradition within the......read more
Australia: Flood Warning System
Inundation from flood waters is an annual occurrence for many living in Far North Queensland.......read more
North Carolina: ALERT Stations Updated
The Charlotte-Mecklenburg Flood Information and Notification System (FINS) consists of over 125 gaging stations spread......read more
Washington: ALERT Station Retrofit
The National Weather Service (NWS) operates a network of automated flood-warning stations around Mount St.......read more
Colorado: RWIS Data from ALERT System
Networks using the ALERT protocol are designed to give immediate access to data that indicates......read more


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