Recommendations for temporary stream diversion channel lining.
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Lining material Acceptable velocity range Upstream drainage area Design storm capacity
Erosion control blanket1 Up to 1.5 ft/sec Up to 1 sq. mi. 2-year, 24-hour
Turf reinforcement mat (non-vegetated)2 Up to 8.0 ft/sec Up to 1 sq. mi. 2-year, 24-hour
Geotextile (Type 1) Up to 11 ft/sec Up to 1 sq. mi. 2-year, 24-hour
Riprap with geotextile
Average 4” (3” – 6”) Up to 4 ft/sec Up to 5 sq. mi. 10-year, 24-hour
Average 8” (4” – 12”) Up to 6 ft/sec
Average 14” (5” – 18”) Up to 13 ft/sec
Plastic sheeting3 > 13 ft/sec Up to 2 sq. mi. 2-year, 24-hour

1 Only for use with intermittent, low flows. Vegetation should be established when using as a channel lining.
2 TRM with temporary seeding may be used when sufficient time is available for the diversion channel to vegetate. The acceptable velocity for vegetated TRMs should not exceed 16 ft/sec.
3 Do not use where woody and other heavy debris moves with flow. Use thicker sheeting for longer runs, or when used for more than six months.

This page was last edited on 24 July 2022, at 15:00.