| do that with the taught string, work out your volume lenth x width x depth.
break it up, into sections and get an overall volume, thats what you go off.
sounds like you have very slow sloping sides.. maybe get a measurement of a mid section and work out the volume and then take the triangle of the slopes and add it to the other for that volume.
then you can know the volume of litres you are worrking with. |