The Hobart Rivulet, part of the River Derwent catchment, is an urban stream located in the Hobart hinterland and flows through and underneath the city, in Tasmania, Australia. The rivulet rises on the slopes of Mount Wellington and flows generally northeast over O'Grady's Falls, Strickland Falls, through South Hobart and past what was known as the World …The Hobart Rivulet, part of the River Derwent catchment, is an urban stream located in the Hobart hinterland and flows through and underneath the city, in Tasmania, Australia. The rivulet rises on the slopes of Mount Wellington and flows generally northeast over O'Grady's Falls, Strickland Falls, through South Hobart and past what was known as the World Heritage-listed Cascades Female Factory towards the Hobart central business district. As a result of urban development, the natural course has been altered significantly. The lower portion of the rivulet has been piped through the city and runs below the central city area. The rivulet emerges again near the Royal Hobart Hospital on Collins Street before flowing underneath the Cenotaph and emptying into the Derwent. The rivulet descends 544 metres over its 7.3-kilometre course.