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1. What is an ALERT Station?

An ALERT Station is the physical structure, either a standpipe or small building, which houses ALERT sensors, such as a rain gauge, water-level gauge, weather sensors or a combination of all of these. Return to Flood Control District

2. Is there additional rainfall, streamflow and weather data besides what is shown in the Rainfall and Weather section of this website?

Yes. Historical weather data, including rainfall and stream-flow information, which does not appear on this site can be provided directly by the District for a nominal fee to cover the cost of compilation and reproduction. Please call 602-506-8701 for more information. Return to Flood Control District

3. Why do most of the rain gages appear to read in increments of 0.04 inches?

Our rain gauges actually read in millimeters. One millimeter is equal to 0.03937 inches, which rounds up to 0.04 inches. Return to Flood Control District

4. Why are there more rain gages in some areas of the County than in others?

The density of rain gauges and the placement of individual gauges are based on a variety of factors, including:
- District Projects in the Area
- Environmental Restraints
- Flood Hazard Potential
- The Location of Channels
- Permitting Requirements
- The Proximity of Existing Gauges
- Watershed Boundaries

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5. Why do some wind speed sensors appear to read so low?

Average Wind Speed sensors do not transmit the instantaneous wind velocity but rather an average wind speed over a time period. They will show a value of "0" or "Down" when there is little or no wind for a 6-hour period. Return to Flood Control District

6. What is a "water-year"?

The water-year is used by the U.S. Geological Survey (USGS) and other federal agencies to define a period of data collection. It runs from October 1st through September 30th. For example, water-year 2006 began on October 1, 2005 and ended on September 30, 2006. Return to Flood Control District