| 摘要 |
The highway and railroad culverts, with or without modification, have been susceptible of being blocked by the natural instincts of beavers, causing flooding and conditions hazardous to human life. In this invention, the culvert opening Is modified by an upstream excavation of a reservoir and the attachment of a beaver-proof device to the existing culvert. This device consists of a vertical inlet extending Into a dug-out reservoir to a depth sufficient to conceal the bottom flow of the water from beavers. The device also conceals the culvert opening where beavers usually start their dams. The water flow is not restricted as the device allows water to flow through the existing culvert at its maximum capacity. The device is adaptable to round or square culverts and can beinsulated to control winter ice build-up. A steam pipe is installed in the unit for the use of steam in spring to thaw ice if necessary. The unit is adaptable for different size culverts.
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