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.