jemma works on herfamily farm next to one of the rivers that feeds into the wye, along with her dad they raise cows, sheep and chickens. feeding them keeps gwen busy as does dealing with a mountain of manure. that muck is gathered underneath this barn. so what happens to it then? some of the manure is collected and they are but there's always a bit of run—off. where does it is a go? see the trench there? down that trench there, down through the grid there. there is a manhole there. the storage tank holds about 3000 gallons. you see that chicken muck floating on the top of the water? in a month or six weeks, that'll run empty again. this muck is full of phosphates, vital for growing the crops we need.