Stream discharge is measured on a catchment (N04D), with 4-year fire return interval and grazed by bison since 1992. Measurements are taken at 5 minute intervals at a triangular throated flume. The prairie streams are 3rd-order and are intermittent. Daily and stormflow discharge records are available.
To study hydrology of streams draining tallgrass prairie catchments, to estimate surface losses of nitrogen (see data set NWC01), and to compare runoff and nutrient loss characteristics among four different burn frequencies (1-, 2-, and 4-year intervals, and unburned).
Location of Sampling Stations: Flumes are located at the base of each catchment ASD02/N04D; ASD04/N20B; ASD05/N01B; ASD06/N02B.
Frequency of Sampling: Stream gage height is recorded every five minutes on the CR-21X datalogger (Campbell Scientific Co.) up to 2012 at which point the depth logger was switched to a SUTRON Accubar Constant Flow Bubbler with integrated data logger. Each record also includes Julian day and time (discontinued in 1999 recorded hourly (see data set AWT02). Data were initially dumped at approximately one to two week intervals from the CR-21X memory to cassette tape (up to about 2000) or laptop computer (2012). Currently data are relayed via wireless to Bushnell Hall every 6 hours and backed up regularly. A computer program is used to reduce and summarize the five minute values into daily summary values and stormflow summary statistics.
Methods: Until 2013, gage height is sensed by pressure transducers (Druck Model PDCR 10/D) and recorded on the CR-21X datalogger (Campbell Scientific Co.), or by a SUTRON Accubar Constant Flow Bubbler with integrated data logger. In 2013, pressure transducers were replaced with air bubblers with an integrated pressure sensor (YSI WaterLOG Bubbler/Pressure Sensor H-3553) and data are recorded on a CR800 datalogger (Campbell Scientific Co.) Conversion to stream discharge requires two steps:
For additional metadata information see: http://lter.konza.ksu.edu/sites/default/files/DC.pdf
For additional methods information see: http://lter.konza.ksu.edu/sites/default/files/MM.pdf