| 摘要 |
A system for preventing or mitigating flooding is used in conjunction with an existing drainage facility such as a creek, sewer or the like, and includes one or more reservoirs, each of which is either an excavation or a subterranean chamber located proximate to the drainage facility. The reservoir is intended to impound water from the drainage facility. Diversion arrangements are employed for diverting water into the reservoir for temporary storage therein in response to abnormal volumetric water flow in the drainage facility, and for returning the temporarily stored water to the drainage facility upon return to normal volumetric flow therein. The diversion arrangements include various conduits between the reservoir and the drainage facility and, in the case of a creek, also include a wall constructed across the creek to limit the flow therein.
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