My back yard is paved and surrounded by brick walls with a shed (on breeze blocks) at the rear. I also have three dogs, who do what dogs do, which means I have to wash, disinfect and bleach etc very frequently. My problem is that the paving slopes to the rear and water etc accumulates in front and under the shed. I obviously need some kind of drainage but am unsure how to do it at a low cost. Has anyone got any ideas please - my back yard smells like a gents at times! Thank you.