Mathematics · Irrigation Engineering

In a tile drainage system, the height of the water table above the impervious layer is 9 m, the depth of the impervious stratum below the center of drains is 8 m, and the permeability coefficient is 0.001 cm/s. The total discharge per unit length carried by the drain is q = 0.75 S8.64 × 106 m3/s/m. Calculate the spacing (S) of the tile drain.