Temporary water retention device (2) comprising: one or more water retaining tank(s) (21), forming a temporary water reservoir and comprising water inlet and/or outlet means, regulation means (23) designed to regulate the flow rate of water through the inlet and/or outlet means, a level sensor (25) configured to measure the level of water retained in the or one of the retaining tanks, and communication means (27) comprising: o a first communications interface designed to receive data from the level sensor, o a second communications interface interfacing wirelessly with a remote server, and o data processing means configured to process data received by the first interface and so that the communication means transmit processed data via the second communications interface.
