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M <br />BMP'S FOR RUNOFF COLLECTION <br />111.6 Corrugated Metal Culverts <br />Purpose: Corrugated metal culverts are used to remove water from <br />roadways. They can also be used to divert water around areas or <br />structures. <br />Application: Corrugated metal culverts are permanent water conveyance <br />structures that can be used on all types of roadways. <br />Specifications: (See Figure III-6) <br />1. Culverts should be long enough to reach across the roadway and <br />extend beyond the fill slope. In addition, culvert outlets must have <br />erosion control structures installed below them to prevent erosion. <br />Z. When installed to convey a stream under a roadway, they should <br />be large enough to carry the maximum stream volume as well as <br />any additional seasonal runoff. Note: Culvert size should comply <br />with the Idaho Department of Water Resources requirements. <br />(See Appendix A) <br />3. Install the culvert in firm, compacted soil with a minimum cover of <br />twelve (12) inches of soil. <br />Mairrtenance: Culverts need to be inspected on a regular basis. They <br />should be cleaned and/or repaired when necessary. <br />l _ <br />f ~~ (` <br />~~„~~_ <br />~~J,• ~ ~ ` <br />IY , _ <br /> <br />Raatl curt ece Earth cover <br />\\d ~\ .:: ~..: 0... . ~ ~ ...~ .. . <br />_~ \\• ••• a •' D1B ~ Mend tenp <br />SECTION <br />Figure 10 <br />Typical Culvert Installation <br />(ldaho 1991) <br />