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Correctly sized riprap used for apron energy dissipation. Rock is correctly placed according to pipe size and outlet velocity and is placed within 24 hours after pipe outlet connects to a surface water.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:14, 3 November 2016 | | 2,304 × 1,728 (1.57 MB) | Mtrojan (talk | contribs) |
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