To provide a field drainage faucet capable of quickly making a plurality of fields function as water reservoirs when a rainfall amount is large, and then properly discharging water from the fields so as not to generate overflow from a drainage channel.SOLUTION: A field drainage faucet 22 for automatically discharging water which has been stored in a field, comprises: drainage water level adjustment mechanisms 22E, 22H for adjusting a drainage water level of a field； a water storage determination part 222 for determining whether the rainwater should be stored in the field, or the water can be discharged from the field； and a drainage water level control part 223 for actuating the drainage water level adjustment mechanisms 22E, 22H when a water storage command is output from the water storage determination part, for switching a drainage water level on the field to a water storage water level higher than a normal drainage water level, and switching a drainage water level on the field to the normal drainage water level by actuating the drainage water level adjustment mechanisms 22E, 22H when a drainage command is output from the water storage determination part.SELECTED DRAWING: Figure 3【課題】降水量の多い時に多数の圃場を速やかに貯水池として機能させ、その後排水路からの溢水が生じないように圃場から適切に排水することができる圃場排水栓を提供する。【解決手段】圃場に貯留された水を自動排水する圃場排水栓２２であって、圃場の排水水位を調整する排水水位調節機構２２Ｅ，２２Ｈと、降水を圃場に貯水する必要があるか圃場から排水が可能かを判断する貯水判断部２２２と、前記貯水判断部から貯水指令が出力されると、前記排水水位調節機構２２Ｅ，２２Ｈを作動して、圃場の排水水位を通常の排水水位より高い貯水水位に切り替え、貯水判断部から排水指令が出力されると、前記排水水位調節機構２２Ｅ，２２Ｈを作動して、圃場の排水水位を通常の排水水位に切り替える排水水位制御部２２３と、を備えている。【選択図】図３
