First FlushTanks
From Industrial Water Treatment Plants
Sizing criteria
This system is made up of a precast modular or monolithic tank containing a party wall and, if applicable, by other containers in the same size in the number needed to reach the storage volume, calculated by applying the 5 mm of evenly distributed rain on a paved surface parameter.
The main module is fitted with an electronic device placed by the inlet, which signals start and end of precipitation and, following a set time of beginning of the same, activates a pump for discharging the water collected so far, directing it to the sewer system, or to the treatment plant if applicable. The tanks are fitted with a standard first flush flow stop float, which acti- vates when the same are full.
The sensor must be periodically checked and, if needed, freed from sediments that may affect its correct operation.
Also tank discharge pump operation must be verified.
Tank size cm 300x200x200 h, is available in both modular (50 cm height modules) and mono- lithic version with 200 cm height and 16 cm thickness. Cm 400-500x200x200 h tanks are only monolithic. Monolithic tanks are single-cast, according to reinforced concrete standards, and bear up to 2000 kg/m² uniformly distributed load.
All systems are fitted with water-tight electronic rain detector and IP65 and PLC protection electrical panel controlling the various functions.
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