Plastic Laminate:		Isophthalic resin reinforced with fiberglass
Tensile strength at break:		17,000 PSI min, ASTM D638
Flexural strength:		30,000 PSI min, ASTM D790
Flexural modulus of elasticity:		12,000,000 PSI min, ASTM D790
Glass Content:		30% minimum
All Surfaces:		Sealed with 15 mils of smooth white gel coat
Concrete Anchor Clips (optional):		Fiberglass
Stilling Wells (optional):		Same as flume
Bubbler Tube (optional):		Type 304 Stainless Steel
Staff Gages (optional):		White with black markings; graduated in feet and tenths of feet. Integrally molded in flume wall.
Wall thickness:		Standard ¼" nominal, 3/8" for large flume wall surface.

Flumes shall be supplied with integral Foam Reinforcing Ribs and Top Stiffener Angles as required by Flume size.

H flumes are primarily designed for measuring flows that vary widely such as seasonal runoffs and overflow from dams. The recommended approach channel length is five times the height of the flume. The width of the channel should equal the width of the entrance to the flume. The flume crest should be set level with the approach channel. The approach channel slope should not exceed 2%. As the flow exits the flume, it must be able to spill clear or flow in a manner equivalent to spilling clear.