| 摘要 |
A water collection system blocks down-pipes to collect water from a roof. A down-pipe (27) is located adjacent a rain water diversion unit (31). The unit comprises a box (36) with the down-pipe (27) fitted to an opening (37) in bottom (38) of the box (36). The gutter (14) has two side-by-side opening s (39 and 40), the opening (40) has an overflow in the form of upstanding wa ll (41) while the opening (39) has a valve plate (42) hinged to the front ed ge at (43). A pneumatic actuator (44) is used to move the valve plate (42) t o the closed position. When the valve is closed, the opening (40) and the up standing wall (41) serve as an overflow back to the stormwater via the box ( 36). The tank pipe (17) also has an opening (45) with an upstanding wall (46 ) which has its upper edge (47) set lower than the upper edge (48) of the wa ll (41) of the overflow. All down-pipes are fitted with diversion units. A c ontroller includes a rain sensor to detect a rain event whereupon a time del ay is imposed for first flush to flush the roof before the valves close the down-pipes. When the tank is full a float is used to operate the controller to open the valves if they are closed or prevent them closing in the case of a new rain event and the tank being already full.
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