Jim Miller, Research Scientist, Agriculture & Agri-Food Canada
We deployed a HOBO Weather Station in southern Alberta. It is used for recording precipitation, wind speed and direction, RH, air temperature, solar radiation and rainfall and soil temperature.
It is in the Lower Little Bow watershed next to a river. The reason we put
it there is the nearest MET station is 10 km away, and we wanted to have site-specific data right in the watershed.
We were looking for a MET station and data logger that was easy to use and was a plug-and-play system. The price was really reasonable, and we knew HOBOs had a good reputation.
We download the data monthly. We are conducting hydrological modeling of the basin so we need to have access to local climate data to use in our computer modeling. We’re also looking at hydrology of the basin, river flow, and we need on-site weather data to correlate to the hydrology and river flows, so if we have a runoff event, for example, we know what the precipitation was. We can also use the MET data to estimate evapo-transpiration.
The reliability of the system has been good, despite the fact that the weather gets down to -30ºC in winter, and we have really strong Chinook winds sometimes in excess of 100 km per hour.
Steven Rice, Hydrologist, Grand Canyon National Park
We use a number of Onset rain gauges in Grand Canyon National Park. We’re investigating the rates and timing of precipitation which recharge the aquifer systems below the canyon rim. We’ve set up a network of rain gauges on the rim as well as at different elevations that correlate with changes in vegetation type below the rim. This allows us to look at how precipitation rates vary along the rim and all the way down to the Colorado River.
We also have rain gauges at three springflow gauge sites to see how much rain is falling at those locations and look at the intensity and timing of storms and the relation to spring discharge and flash floods.
Some of the rain gauges are in very remote and harsh locations, and i
t can take a full day just to get to them. Some of them have been working reliably since 2001.
We offload the data four or five times a year using a data shuttle. We then use HOBOware to take the data in and export into Excel. Then I plot it up and compare the data to other information like spring discharge and temperature.
We’ve run trend analyses on the discharge at the three springflow gauges because the area has been in drought and have seen decreases in spring discharge at some of these sites. We’re using the collected data to help understand if this is a result of groundwater pumping that is occurring just outside the Park boundary, the drought conditions, or a combination of the two.
Because the equipment is deployed in the National Park, we want to keep it out of the way and inconspicuous. At a few locations, we surround the rain gauge with rocks so it remains open to the sky but is not visible. There are also some attached to existing structures in the Park so they’re out of the way. We plan to expand the rain gauge network in 2009.
