Discharge data is the most important input variable used to measure fish survival, productivity, and capacity in any model. Therefore, OBMEP has begun a new collaboration with USGS where our staff collect discharge data and maintain stream gaging sites following USGS standards and these data are reviewed and published by USGS on their NWIS web page.
Real-time and historic discharge records are available for three gages on the Okanogan River, and one each on the Similkameen River, Loup Loup Creek, Salmon Creek, Omak Creek, Johnson Creek, Bonaparte Creek, Antoine Creek, and Ninemile Creek. Links to these USGS webpages can be found here.
Discharge in Canada is measured at four locations on the Okanagan River by Water Survey Canada. On Canadian tributary streams a pressure logger piezometer is used to establish stage data at all sub-watersheds where anadromous fish exist but discharge is not currently being collected, and a temperature data logger is placed at these same sites thus linking discharge and temperature data.
Temperature loggers are deployed at the beginning of the water year (October 1st) at annual transect-based habitat sites. Water temperature data downloads and equipment checking occurs after the ice breakup, spring freshet, and before ice formation. Temperature loggers are set to collect temperature once per hour throughout the entire year. Data is checked for errors and uploaded into the OBMEP database.