The surface and subsurface drainage systems carried out for eliminating the excessive humidity on agricultural lands were designed with respect to the exploitation of surfaces on the draining sectors. The different soil works performed on each individual plot has led, in time, to the formation of ridged strips of variable widths, level differences and transverse slopes, depending on the width of the plots, on the manner in which they are used and on the machinery employed for the agricultural works conducted. On the arable drained land surfaces with individual parcels orientated along the level curves, the land shaping in ridge straps produced water stagnation on drains and the accentuation of excessive humidity especially in spring and raining seasons which lead to the gradual passing of the parcel to a lower category of use, that is grasslands.