OK southend fishing mmmm, as my name suggests location is here l.o.l, you asked for runs waters.Are you new to carping or an experienced carper. If your new to it then stambridge fisheries near rochford is a runs water, never fished it because its too commercial for me. If you can walk/carry ok Doggetts in rochford, not a runs water but not hardest water for doubles, and with effort it holds 20s and 30s, my p.b 30 came from there may 08. Anything you wanna know i will help on this one.Priory park worth a go, few good upper 20s in there . Rochford reservior, it was netted and is far from a runs water but with a little effort its possible to land doubles. Hope this helps, feel free to pm me.