 The study presents a method to track temporal variability in surface water extent using freely available high temporal and spatial resolution synthetic aperture radar, SAR, satellite data such as Sentinel-1, resulting in a dataset that can differentiate between permanent and recurring lakes as well as capture rivers with a width of over 30 m. The methodology is anticipated to be further enhanced and refined with imagery available for 2018 and beyond due to now operational Sentinel-1B satellite and future radiosat constellation mission, 2018. This article was authored by Evan Udylansi, Johan Kariyeva, Jerome Cranston, and others.