In the province of Newfoundland and Labrador, near real time streamflow and climate data is collected from remote sites via the Geostationary Operational Environmental Satellite (GOES) system owned by the United States governments National Oceanic and Atmospheric Administration (NOAA) and operated by the National Environmental Satellite, Data, and Information Service (NESDIS). At the present time there are over 100 Data Collection Platforms (DCPs) in operation in the province.
In 1986 the Water Resources Management Division developed a series of microcomputer based programs called the Automatic Data Retrieval System (ADRS) which automatically collects, processes and distributes this information.
Some milestones for this system have been:
The following is a brief description of how the ADRS operates and a graphic depicting the system is also available.
The primary use of ADRS data in the Water Resources Division is for flood forecasting and other users of ADRS data include federal field service personnel with Environment Canada, other government agencies (federal, provincial and municipal), hydropower companies and a variety of recreational users.
Water is measured and represented in two ways - streamflow and stage/elevation.
Streamflow is the volume of water in a river at a specific location and time. It is measured in cubic metres per second.
Stage is an engineering term with respect to how the water level in a river is reported. Stage is a not measurement of the actual depth of water in the river. It is a measurement used to show the change in water level in a river.
If the measurement device for water level in a river is tied into a surveyed ground elevation (like contour lines on a topographic map) it is reported as Elevation in metres.
However, most stations are not surveyed for elevation and the water level in the river is measured against an arbitrary ruler that might start with the river bottom stated as being at 2.0 metres. The water level is then reported as Stage in metres.
Streamflow is not directly measured at rivers - only water level. Streamflow is calculated from a customized flow equation that is based on stage measurements at each river taken over an extended period of time during different flow conditions. Each stage or elevation value is used in the creation of the equation to calculate flow.
The flow equation is not linear. This means is that while the up and down motion of the flow and stage (or elevation) graphs will be similar most but not all of the time. The difference is due to the shape of the river bottom and banks. The non-linear part of the equation is usually for the high and low flow portions.
The stage value is very useful. For example looking at a station graph we can see the change in the height of the water in the river at that station that over the last 30 days.
Provisional Near-Real-time Streamflow and Climate Data displayed on these pages are obtained from a network of gauges maintained under the Canada-Newfoundland Hydrometric Network Agreement. The operation of the network is cost shared by federal and provincial government departments and private companies.
Due to the volume and frequent updating of the data available on this Web site the streamflow and climate data is PROVISIONAL and has not undergone quality control checks. These data may be subject to significant change. Some of the factors that may affect the stage-discharge relationship and other measurements include:
Data are reviewed on a regular basis by Environment Canada personnel to ensure accuracy. Each station record is considered PROVISIONAL until the data are published. The data are usually available within six months of the end of the water year. The publication quality data is distributed yearly by Environment Canada on a for all streamflow gauging stations in Canada.
Before using this data in making decisions that concern personal or public safety, substantial monetary expenditures, or other operational consequences, users must carefully consider the provisional nature of the information.
Information concerning the accuracy and appropriate uses of these data or concerning other hydrologic data may be obtained by contacting Howie Wills, Environmental Monitoring at:
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