We do it a little bit diffrent over here, we use a twin pond system, goes from the cow shed to the 1st pond and then flows thru a baffle pipe into the second pond and then is pumped out on to the paddocks via travling irigator
How ever the councl is going away from this and now its a Very big concrete pit and pumped directly out to the paddocks, i personaly dont like this as its raw effluent going on the paddocks apposed to filtred, and most importantly, There isnt much capaicty for a pump break down or any thing, most places is one day if they are lucky, The laws say you need 3 days capacity but most farmers dont run them till the pit is full sort of system so they dont have the emergncy capacity sort of thing