Uniform Section Mat (USM)

Uniform Section Mat (USM) fabric forms are constructed with spacer cords on closely spaced centers to form a lining of required nominal thickness, bonded cobbled surface and specified weight to provide strength and erosion protection. The design criterion for selection of lining thickness is the same as that used to determine the thickness of conventional concrete slope paving. Relief of hydrostatic uplift pressure, caused by entrapped and ground water, may be provided by inserting plastic weep tubes through the mat at specified centers. Uniform Section Mat (USM) is custom fabricated into multiple mill width panels, designed to fit actual site dimensions and topography.

 

Uniform Section Mat being pumped.

Uniform Section Mat used to line a high volume drainage ditch. drainage

DESIGN CONSIDERATIONS

 

USM is used where velocities are low to high, bedload and ice formations are light and a roughness coefficient of N = 0.015 is required.

 

USM is used where wave action is light.

 

USM reduces seepage losses in reservoirs, ponds, holding basins and channels.

 

USM is ideal for underwater placement.

 

USM is recommended for drainage flumes and spillways.

 

USM should be installed on well compacted soil conditions only.

UNIFORM SECTION MAT (USM)

USM size

Nominal

Thickness

Weight/

sq. ft.

Coverage/

cu. yard of

Concrete

3" USM

3.0"

35 lbs.

97 sq. ft.

4" USM

4.0"

47 lbs.

73 sq. ft.

6" USM

6.0"

70 lbs.

49 sq. ft.

8" USM

8.0"

93 lbs.

36 sq. ft.