Thickness of a penny used to be talked about every drain out and could make it heavier or light depending on how fast they let water outYup.
Lots of land round here was warped - Gainsborough being about the furthest extent of it. If you know what you're looking for you can find or figure where the warping drains are. They reckoned on the humberhead levels you could warp 9" of silt in a year.
But the warping like this was obviously limited by how far turgid water will travel. Hence the warping near lindolm was "dry" warped.
The last warping round there was at medge hall near crowle after ww1.
Much of the vermuden drains were not great. My 5x great grandfather was the first to plough some fresh drained land at what is now Potteric Carr nature reserve. Was so boggy he built shoes for the horses to make the surface area much larger.