HDD Back Reaming/Pump Volume Calculator 1 Formation ----Select---- Cobble Sand/Gravel Sandy Clay Clay Reactive Clay 2 Ream Diameter ----Select---- 6 inch 8 inch 10 inch 12 inch 16 inch 20 inch 24 inch 28 inch 36 inch 3 Rod Length ----Select---- 10 foot rod length 15 foot rod length
