| 摘要 |
An auxiliary drain line is laid in a trench which extends about lower foundation portions of an existing building but at locations preferably spaced several feet from the foundation. The newly laid auxiliary drain line is formed of perforate material which admits surrounding ground water, and is connected to a storm drain line that serves the building so that water which enters the auxiliary drain line is discharged into the storm drain line. A porous reservoir is formed in the trench to (1) duct ground water to the auxiliary drain line, (2) eliminate ground water pressure buildup in the vicinity of the foundation wall, and (3) provide a ground water reservoir during an excessively heavy rainfall when the storm drain line may be incapable of carrying away all of the accumulated waterfall. The auxiliary drain line is laid in the trench at a level below the top of the basement floor of the building. In the event the storm drain line is found to be positioned too high to permit the auxiliary drain line to discharge into it properly, (1) a manhole is constructed, (2) the auxiliary drain line is connected to discharge into the manhole, and (3) a sump pump is provided in the manhole for transferring water from the manhole to the storm drain line. Branch lines may be installed in short underground tunnels to connect the new auxiliary drain line with an existing footer drain line system which surrounds the foundation of the building. The building's downspouts may be rerouted to the auxiliary drain line as needed to bypass clogged storm drain line sections. The building's downspouts are preferably provided with specially configured leaf traps which may be cleaned out at ground level.
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