Recommendations for temporary stream diversion channel lining

Recommendations for temporary stream diversion channel lining.
Link to this table

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.