artificial drainage pattern
   Human-made networks of drainage structures (ditches, canals, etc.) built primarily to lower or control the local water table in low lying, flat topography such as glacial lakebeds, broad flood plains, low coastal plains, or marshes most commonly in humid climates. Irrigation ditches found in arid and semiarid climates, which bring water into the fields, should not be confused with drainage structures.
   SW & WA

Glossary of landform and geologic terms. 2013.

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