STORAGE TANK, SIPHON-TYPE DRAINAGE SYSTEM, AND OUTFLOW-PIPE CONNECTION MEMBER

摘要

This storage tank is provided with: a storage-tank main body (32) capable of storing a liquid flowing into the inside thereof from the upstream side; a flow-path reduction part (36S) which is provided to the downstream side of the storage-tank main body (32), has a flow path cross-sectional area at the downstream side which is smaller than that at the upstream side, and has an inner bottom section (36G) which is formed lower than an inner bottom section of the storage-tank main body (32); and an outlet (OUT) which is provided to the downstream side of the flow-path reduction part (36S), and which allows the liquid to flow out to the exterior of the storage-tank main body (32). The storage tank is used to build a siphon-type drainage system. An outflow-pipe connection member (36) is provided with the flow-path reduction part (36S) and the outlet (OUT), and is attached to the storage-tank main body (32).