Around 20 cents. I guess your asking about poking holes for each row? We leave end of pipe open laid over a 30 gal barrel split in half. Have also been connecting a 10 pipe fitting to end which also helps to restrict flow some. We start water up and prick air vents in top of pipe with a flag wire with sharpened end on it. When pipe get fairly tight we start poking holes. My wife usually ends up sitting on top of the pipe on the barrel also to restrict flow but will still let water escape without bursting pipe until I get all holes punched. Have gearhead wells with engines so can vary the amount of water being pumped.