Patent ID: 9689132
Date: 2017-06-27
CPC Classifications: E02B

Claim:
1. A drainage ditch, comprising a ditch body, a water outlet, and a water inlet; the ditch body, from the top down, comprising a separate layer, a first filter layer, a second filter layer, and a third filter layer; the water outlet and the water inlet each comprising a regulating gate valve; and the regulating gate valve comprising a gate, a valve core, and a spanner; wherein the separate layer is straw or stover; the first filter layer is crush stones having particle sizes of between 5 and 15 mm; the second filter layer is crush stones having particle sizes of between 20 mm and 40 mm; the third filter layer is stones having particle sizes of between 30 mm and 70 mm; the separate layer is covered by a plough layer; the water outlet and the water inlet communicate with an outfall or an estuary; the gate comprises a hollow cylindrical sleeve in the middle thereof; a top of the hollow cylindrical sleeve is open and a bottom thereof is closed; the hollow cylindrical sleeve comprises a pair of opposite holes at a lower part thereof; the valve core is cylindrical and matches the hollow cylindrical sleeve, and an outer wall of the valve core is corresponding to an inner wall of the hollow cylindrical sleeve; the valve core is higher than the hollow cylindrical sleeve of the gate, and a valve head stretches from a top of the valve core; a cross section of the valve head is a polygon; a lower part of the valve core is provided with a through hole; when the valve core is inserted in the hollow cylindrical sleeve, the through hole at the lower part of the valve core and the pair of holes of the hollow cylindrical sleeve are at the same height; and when the valve core is rotated at an appropriate angle, the through hole and the pair of holes communicate with each other; and when the valve core is rotated at another angle, the communication of the through hole and the pair of holes is blocked.