Transition mats mechanically protect scour and high-stress areas, and other BMP soil covers manage the remaining areas. This combination of BMPs creates great economic synergy over hard armor options.
See specifications for details and use on different soil types.
At pipes and curbs, the scour area is protected from high-energy water-forces by a ScourStop™ system, and the high-energy is dissipated via the expansion / widening process of the scour area over a calculated distance downstream. The resulting downstream forces are managed by appropriate soil covers calculated and specified as part of the transition mat engineered system.
The transition mat system provides mechanical protection at both
the crest of the dam structure, if required for the design flows; and
at the toe of the slope, where the velocity of the flowing water has maximized its velocity, and thus its shear force.
The transition mat system provides mechanical protection against flowing water while reinforcing vegetation against shear forces. The mats act as an extremely effective ‘ballast’ (7 times more than hard armor) securing geotextile to the soil in the stream bed and up to the vegetation zone; and soil stabilization - to some extent – up to 36 inches deep.
The transition mats system provides mechanical protection against wave action while acting as an extremely effective ‘ballast’ (7 times more ‘hold down’ capacity than hard armor – 70 pounds / sq. ft. versus 10 pounds / sq. ft.) over the properly-sized geotextile fabric. The geotextile fabric secures the soil particles from movement caused by pressure-differentials in the wave action. Vegetation is established and reinforced above those wave levels.
The transition mats system can secure a geotextile or appropriate TRM for temporary protection until vegetation is desired, and then it can be easily removed and reinstalled.
The transition mat system secures a heavy geotextile (12 oz.) against levves constructed of non-cohesive soils. the deep anchoring system combined with a semi-rigid mat to prevent sand soil particles from migrating with variable water levels.
- Levee and canal stabilization - reinforcing vegetation, surface soils, and restricting tunneling rodents, while weighing 10 times less than hard armor.
- Soil protection under cable-barrier systems between double lane highways.
- Use under commercial and residential rain spouts.
- Emergency-vehicle access lanes..
- Stream crossings.
Note:
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Cohesive and Non-cohesive Soils. Sandy soils have very different erosion properties and their own separate set of specifications. We recognize this significant critical element and have created construction standards and specifications for this challenge. The transition mat system works the same, but there are fewer options for use of soil covers and vegetation types. Click to see specifications.
Semi-arid and 'cool' climates where vegetation is challenged. It is often better to fall back on non-cohesive soil specifications, or a high-level cohesive soil specification.
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We have 75 construction details drawn up and ready for designers to download and customize to their own site needs.
Here are some examples and most others are referenced in the design section.
- Vegetation Channel Sod C Soils
- Occasional Overflow Structure with Pipe Sod C Soils
- Curb Outfall TRM Over C Soils
- Vegetated Splash Basin TRM Over Sod C Soils
