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DITCHING AND DEWATERING
DITCHING AND DEWATERING 5.27
FIGURE 5.18 Corrugated-pipe detail.
It may be strengthened somewhat by stretching it vertically, in the manner to be described for
corrugated pipe. Struts may be left in permanently, but are likely to catch debris and to cause clog-
ging. Such installations usually are temporary.
Threaded iron water pipes or well casings are sometimes used for small drains or culverts when
they can be obtained second-hand, or no other pipe is available. If the used pipe can be bought
cheaply, it is ideal for draining small quantities of water through drives or fills during construc-
tion, if the regular drainage system is delayed. It will not pull apart under any natural stress, resists
bending, can be cleaned out with a plumber’s snake, and is easily salvaged by pulling out from
the end, or digging out.
BRIDGES
When a road or other continuous embankment crosses a stream or drainageway, it is usually car-
ried over it on a bridge or a culvert.
