One of my “go-to” reference books is the 975 page “Bibliography of Hydrometry” by Steponas Kolupaila, so this document about his contribution to hydrological science caught my eye. Throughout the 20th century, the effects of politics and geography isolated practitioners of hydrometry as effectively as if they were finches on the Galapagos Islands. The result was specialized regional methods for everything from discharge measurements to rating curves. These specialized regional methods developed to the point where inter-breeding of ideas was no longer possible. I have always admired Kolupaila’s quixotic attempts to encourage cross-breeding through knowledge exchange to ensure a robust and resilient future for hydrometry. This is a wonderful tribute to a great scholar.