Since 2010, NHC has conducted low flow monitoring for water supply streams and provided estimates of the minimum daily discharges observed each year. Three of the monitoring sites incorporated V-notch weirs coupled with water level sensors; this method required multiple field visits to download the water level data and calibrate the weirs’ discharge rating curves using salt-dilution methods. For the fourth site NHC configured an ultrasonic flow meter and telemetry unit to provide a real-time data feed to the District of Tofino. At the end of each season, NHC undertakes QA/QC on the data and reports results. NHC used the data to carry out a detailed hydrological modelling and analysis of the water supply creeks. This study provided the District with an estimate of extreme drought conditions for a range of occurrence frequencies.