What is the size of the Mark 1?

The Mark 1 is housed in a small, rugged, waterproof, polycarbonate case. Dimensions are: 4.5 x 4.5 x 2.4 inches. The unit is installed directly above the water surface, pointing vertically down to insure that changes in stage (water surface elevation) are accurately reflected in the sonic measurements.

What is the accuracy of the unit?

At 15 feet from the unit to the water surface, the accuracy is within 1 millimeter.

What is the power source of the unit?
It can be operated by solar panel or a wired 5 volt power supply.

Can I attach probes, such as a temperature probe or turbidity probe to the Mark 1?
Yes, you can attach up to 6 approved probes to the Mark 1

Is there a database server that I can use?
Yes, an independent, secure database has been set up at Pacific Watershed Associates for users who want PWA to house that data. Your data is secure and available to you at any time. Your information is not shared by PWA with anyone without your specific authorization.

How is the data transmitted to my PC or database server?
By a web based download from the cloud server.

If I use the independent database will the report data be transmitted to the SWRCB database at the scheduled report time?
Yes, if you authorize PWA to do so.

Can I keep track of diversion water sent to storage?
Yes, of course. The Mark 1 can measure water storage levels, starting a new storage unit pump when the water in the current storage unit has been utilized or reaches a pre-determined level.

What is the cost of the Mark 1?
The base PWA Mark 1Telemeter cost is $1,875. Please ask about available options and their costs.

Some Definitions That May Be Helpful:

Telemetry is the science and technology of automatic measurement and transmission of data from remote sources to receiving stations.

A microcontroller, the printed circuit board inside the Mark 1, is a compact circuit board designed to govern the operation of embedded systems in motor vehicles, robots, office machines, complex medical devices, home appliances, and various other devices. A typical microcontroller includes a processor, memory, and peripherals. The microcontroller was developed in 1977 and over 5 billion are sold each year.

Stage is the elevation of a water surface. Stream stage is the height of the water surface above an established altitude or bench mark, where the stage is zero. The zero level is arbitrary, but is sometimes measured close to the streambed. In that case, when stage is zero, stream discharge is also zero. Stage is most often used with respect to the surface of a stream or river, and is used to determining the discharge of that water, but it can apply just as well to the water surface of a canal, pond or lake.

Sonar (Sound Navigation and Ranging) Sonar works by emitting pulses of sound and listening for echoes. This is similar to today’s use of ‘pinging’ to detect Internet bandwidth speed. Ultrasonic sonar utilizes extremely high frequency pings. The Mark 1 uses SONAR to detect water surface elevation or stage. When the mean velocity of the stream has been measured and cross sectional areas surveyed for various discharges at that cross section, a stage-discharge rating equation is developed. Using this rating equation, the surface elevation of the stream can then be used to determine the discharge of water passing by a given reference point. Diversion discharges can be shown in relation to past diversions, your diversion water goals, or to critical low flow discharges that may be legally required to be maintained.