... observed action is the more determinate and valuable as regards time and effect, as the land was saturatedwith moisture previous to this particular fall of rain, and the pipeshad ceased to run when ... drain down arapid slope, and continuing it with the least possible fall throughlevel ground. When such changes must be made, they shouldbe effected by angles, and not by curves. In increasing ... soil. Compact clays yield very little, and wet, runningsands, (quicksands,) a great deal. In a soil of the latter sort, orone having a layer of running sand at the level of the drain, theditch...