| 21. | The dissolution process produces a distinctive landform known as " karst ", characterized by sinkholes and underground drainage.
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| 22. | The University Lands project installed more than 23 miles of underground drainage piping, as well as sump pumps.
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| 23. | Bioretention swales are drains planted with plants which will filter and channel rainwater into the underground drainage system.
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| 24. | The greenish ditches drain the water towards openings called Ponors, which are part of the karstic underground drainage system.
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| 25. | After the irrigation system was fixed, the underground drainage system that took water away from the trees broke down.
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| 26. | Electric utility trucks and other heavy equipment used in the cleanup have smashed some underground drainage pipes, said O'Kane.
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| 27. | It took about 35 hours for eight divers from Fire Services to search the underground drainage system in the dark.
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| 28. | A : A dry well is a hole in the ground that serves as an underground drainage pit or sump.
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| 29. | Much of the flow of the Aucilla River has been captured by an underground drainage system created by karst processes.
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| 30. | In the 1830s state engineer George T . Dunbar proposed an ambitious system of underground drainage canals beneath the streets.
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