APISHAPA WATERSHED
Protecting Water Quality through Monitoring, Assessment and Education
Equipment Information

In-Situ Aqua Troll® 200

Each of the three gaging stations along the Apishapa River is equipped with an In-Situ Aqua Troll® 200 transducer that measures and records pressure, temperature, and conductivity every 15 minutes. Parameters derived from the conductivity measurement include actual conductivity, specific conductivity‚ salinity‚ TDS‚ resistivity‚ and water density. Data from the transducer are downloaded every two weeks and processed every six to eight weeks. The following documents were provided by In-Situ Inc. and can also be found at http://www.in-situ.com/.

Campbell CR850

A Campbell CR850 datalogger with a direct readout display is installed at each of the three gaging stations along the Apishapa River. The datalogger records pressure, temperature‚ and conductivity every 15 minutes and the direct readout display provides a real-time reading every one minute. The CR850 datalogger has been programmed to calculate flow using the established rating curve at each station and is also part of the direct display output. Data from the CR850 datalogger are downloaded every two weeks and processed every six to eight weeks. The following documents were provided by Campbell Scientific and can also be found at http://www.campbellsci.com/cr850.

Pygmy Current Meter

A Model 1205 or 1206 Price-type "Mini" Current Meter, also referred to as a Pygmy Meter is one type of current meter used to measure flow velocity in the Apishapa River. Velocity is measured within subsections of a stream's cross-section by counting the number of revolutions a bucket wheel makes in a given period of time. This count is either put into an equation or compared on a cross-reference chart to yield water flow velocity. Each subsection velocity is multiplied by the depth of that subsection to get a flow volume. The individual subsection velocities are summed to get a total flow volume, which is used to establish a rating curve. More information on the Pygmy Current Meter can be found at the Rickly Hydrological Company website at http://www.rickly.com/sgi/pygmy.htm.

Marsh-McBirney Current Meter

A Marsh-McBirney Model 2000 Flo-Mate is one type of current meter used to measure flow velocity in the Apishapa River. Velocity is measured within subsections of a stream's cross-section by calculating the voltage that is produced as water passes through the magnetic field of the meter sensor. Each subsection velocity is multiplied by the depth of that subsection to get a flow volume. The individual subsection velocities are summed to get a total flow volume‚ which is used to establish a rating curve. More information on the Marsh-McBirney Current Meter can be found at http://www.marsh-mcbirney.com/p_oc_flomate.html.

Apishapa Watershed
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Apishapa Watershed

Norwest Denver Office
950 South Cherry Street
Suite 800
Denver, CO 80246
Telephone:  303.782.0164
Fax:  303.782.2560
Email:denver@norwestcorp.com

Apishapa Watershed


Apishapa Watershed
FAQ
Apishapa Watershed

What is a Watershed?
A watershed is an area of land where water from rain and melting snow and ice drains downhill into a body of water. The watershed includes both the streams and rivers that convey the water as well as the land surfaces from which water drains into those channels.

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Apishapa Watershed


Apishapa Watershed