Reihys y voluum dy studeyryn son jannoo rieughid concrete
Cur fys ayns millimeteryn
D - Diameter y rheynn beton
A - Thiaght ballagh
H - Ard
Ta'n program er ny yannoo son ymmyd jeh'n studeyrys as y volume jeh'n rheynn concrete.
Ta'n volume jeh'n concrete, y volume inshley as diameter y ring, y mhean as y slyst jeh'n mesh reinforcing er nyn rheynn.
Ta ringyn concrete ry-chlashtyn son ymmyd 'sy 'septic tank' as 'septic tanks'.