Are blocked drains adding to the flooding in Haringey? Earlier this week, in a post entitled Draingate a Crouchender wrote on social media about how the high number of blocked drains in the borough is exacerbating the flooding we've been experiencing. Brian Bowles wrote, Following the original flood on 12 July I made an assessment of the blocked drain covers / gullies in the roads leading up to Muswell Hill Rd. from Park Rd. This is by no means definitive but it is representative. As most people are aware all these roads are at a level higher than Park Rd. with a steep gradient down. And so, if the drains covers are blocked, then the water will flow over them to reach the lowest point.