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並前往https://www.virginiadot.org/business/resources/LocDes/DrainageManual/chapter7.pdf

Chapter 7 — Ditches and Channels - Virginia Department of ...

Appendix 7D-3 Standard VDOT Riprap Classifications, Weights, and Blanket Thickness ... EC-3 Type 1, when the 2-yr design velocity is between 4-7 fps.

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