The active root depth of the crop is limited to the top 50 cm of the soil profile. Hydraulic conductivity measurements for this field indicated two distinct soil layers overlying an impermeable stratum located 12.0 m below the ground surface. The hydraulic conductivity of the top layer was measured to be 2.2 m/day while the layer located at 0.9 m below the ground surface had a hydraulic conductivity of 1.8 m/day. The tile drain diameter is 4 inches. Assume that the tiles are located at the boundary between the two soil layers. (a) Calculate the optimal drain spacing for the above field assuming a recharge rate of 3 mm/day under steady state conditions. (b) Calculate the optimal drain spacing for the above field assuming a recharge rate of 6 mm/day under steady state conditions.
The active root depth of the crop is limited to the top 50 cm of the soil profile. Hydraulic conductivity measurements for this field indicated two distinct soil layers overlying an impermeable stratum located 12.0 m below the ground surface. The hydraulic conductivity of the top layer was measured to be 2.2 m/day while the layer located at 0.9 m below the ground surface had a hydraulic conductivity of 1.8 m/day. The tile drain diameter is 4 inches. Assume that the tiles are located at the boundary between the two soil layers.
(a) Calculate the optimal drain spacing for the above field assuming a recharge rate of 3 mm/day under steady state conditions.
(b) Calculate the optimal drain spacing for the above field assuming a recharge rate of 6 mm/day under steady state conditions.
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