| The cross section drawing also specifies underdrain outlet height as determined by the user to detain water for infiltration. |
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| If the depression holds water for more than four hours, dig 10 to 15 inches deeper and provide an underdrain of gravel. |
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| We removed the underdrain of each microplate and allowed the plate to stand in the room atmosphere for 1 h before array printing. |
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| When the fill is completed, this underdrain will form a continuous water runoff system from the upper end of the valley to the lower end of the fill. |
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| A total of 5cm of 12mm diameter underdrain gravel is placed at the bottom. |
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| The Greater Cincinnati Water Works replaced the sand media and underdrain systems of four test filters and operated the filters continuously for 12 months. |
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