| 摘要 |
<p>A rain water vessel (1) comprising a water inlet (21), a main tank (26), a dump tank (27), a diverter valve (31, 32), wherein the diverter valve (31, 32) is, after a period without rainfall of less than 1 hour, normally in a first condition such that on rainfall commencing to direct rain water entering the inlet (21) to cause the rain water to flow to the dump tank (27). Control means (33) operative, on the dump tank being filled with water to a predetermined amount, to cause the diverter valve to be put in a second condition such that on rain fall continuing to direct rain water entering the inlet (21) to cause the rain water to flow to the main tank (26), and drain means operative (34, 36), when the dump tank (27) contains said predetermined amount, to lower the amount of water in the dump tank over a period of time in excess of 1 minute by outflow to the exterior of the vessel (1).</p> |
