Heavy rains crossed the HOAL catchment area last week. In 24 hours, 160 mm of precipitation fell, the highest measured precipitation intensity was 57 mm / 10min. The highest measured discharge in the catchment area was > 800 l/s and the installed H-Flume there was overflowed. This was also proven by…

For measuring transpiration on trees, so called "Sap Flow sensors" were installed. In sum six stations were placed to be able to scale the sap flow for the hole forest.

Beside that, they are installed near groundwarter, discharge and soil moisture station.

>> View Sap flow installation (MP4)

As the catchment outlet (MW) is one of our most important measurment points, a new radar sensor is now installed for measuring the water level. Discharge can be monitored using the H-Flume's high discharge calibration curve. As the catchment outlet station - MW is one of our most important measuring…

In august Borbala Szeles, Patrick Hogan and Lovrenc Pavlin were on site, supported by Matthias Oismüller and Gerhard Rab, to maintain some of the weather station devices such as temperatur and soil heat flux sensors. The eddy covariance systems (evaporation) were checked and calibrated with a dew…

As predicted last weekend heavy rain fall occured in eastern Austria. Also the HOAL was affected by high precipitation rates.

In 24 hours around 90mm of rainfall occured and this led to a discharge rise at the catchment outlet from 2 l/s to around 1000,0 l/s. Compared to the mean rates (820mm/year…

Due to the old age of the H-Flumes and the poor condition, new ones were dimensioned, designed, manufactured and installed. A total of eight new "modified H-Flumes" made of stainless steel were installed.

The measured data can be used for calculating the flow paths, but also for the…

Around the start of this year the disicion was made to install new measuring weirs. These weirs are designed according to the "Field manual for research in agricultural hydrology" from the United States Department of Agriculture (Handbook number 224). By evaluating the existing measurements over the…

On 14th of November, two boreholes with depths of 8 and 6 m respectively, were drilled at the HOAL site next to the stream in the alder forest area. Previous geophysical investigations in this area have revealed a significant anomaly characterized by high induced polarization signatures, which so…

On the 5th of June, a group of students of the Vienna Doctoral Programme on Water Resource Systems, with a research interest focusing on hydrology, visited the Hydrological Open Air Laboratory, HOAL. They got an introduction about the history and ongoing projects of the Institute for Land and Water…

On 17th of April there was a big maintenance at the HOAL weather station with repairing and maintaining equipment like humidity, temperatur and wind sensors. Casings of data and power supply cables were checked for damages, which e.g. sometimes can occur by animals.

Also the weather conditions in…