Also, for treatments with drain spacing of 15 m, the depths of water table in the Bi-level were lower than the corresponding values in the [D.
Also, the results suggested that reducing the drain spacing promoted the root zone aeration.
65 m and drain spacing of 30 m could provide desired water table level during wet seasons.
From a construction standpoint, however, it is best to maintain uniform drain spacing.
Selection of an appropriate DC is important in the design process, as all drain spacing and drain diameters will be based on this value.
where R is the rainfall rate (L/T), S is the drain spacing (L), and x is the position of section "A-A.
The threshold drain spacing for each criterion was determined from Figure 5.
The rate of subsurface drainage is small for drain spacings greater than 175 m on this soil, so results in Figure 3 are not very sensitive to ditch spacings beyond that range.
Predicted yields for the optimum drain spacings for corn production on each soil are also given for comparison.
Ernst relationship for designing the ideal drain spacing is (Sutton, 1971; Beers, 1976; Martinez Beltran 1978; Kroes & Van Dam, 2003; Teusdea et al.
The drain spacing, L, is given by the equation (2) positive solution.
The valid subirrigation systems are only the drainage systems that have the drain spacing greater than 22 m.