While the term 'riverkeeper' might conjure something out a Grimm brothers' fable, there aren't any trolls or fairies to be found here. Instead, what we've got are a global network of excitable nerds passionate about their local waterways. In Melbourne, there has been a recent changing of the guard, with Charlotte Sterrett becoming the Yarra/Birrarung's third riverkeeper in January. It's time to meet Charlotte… on the river.