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Free Flow H, HS, HL Flume Typical Specifications

There shall be supplied a Free Flow Model SC H (HS or HL) flume with a sidewall height of _____feet.

Flume to be molded in one piece of reinforced polyester fiberglass with 1/4" minimum wall thickness. Wetted surfaces shall have smooth white gel-coat finish; exterior surfaces shall have gel-coat finish & "V" shaped reinforcing ribs to prevent distortion during shipment, installation and operation. Flume shall be self supporting and require no external supporting structure during installation.

Internal dimensions shall conform to the latest revision of the FIELD MANUAL FOR RESEARCH IN AGRICULTURAL HYDROLOGY, Agriculture Handbook Number 224, published by the U.S. Dept. of Agriculture.

Head gauges: Head gauges shall be flush molded into flume sidewall at time of manufacture. Gauge markings shall be protected by a 1/16" clear fiberglass laminate. Gauges shall have markings in feet, by 1/10th & 100th of a foot.

Anchor clips: There shall be provided fiberglass anchor clips permanently attached to flume exterior. Clips shall have 1/2" dia. hole for wire securing flume to reinforcing bar embedded in concrete.

Ultrasonic Transducer Mounting Bracket: There shall be supplied with the flume, an elevation adjustable bracket, fabricated from 316 SS piping & alloy fittings with a _____” female NPT conn. to the transducer. All fasteners shall be stainless steel.

Bubbler tubes: There shall be provided a flush mounted 304 SS bubbler tube of 1/2" O.D. at the depth measuring station. Bubbler tube opening shall be set in flume wall such that water depths down to zero flow may be measured.

Sensor Cavity & "Z" Bracket: There shall be provided a sensor cavity and stainless steel "Z" bracket to allow flush mount installation and easy removal of a submerged pressure sensor manufactured by ________. The bracket, cavity & sidewall "D" track shall allow routing the cable out of the flume with the bracket, sensor and cable all flush with flume wall & floor.

There shall be a permanently attached stilling well of_____(8" or 12") diameter at the depth gauging position. The well shall extend (4" or 6") below the crest of the flume. The connecting port shall be a 2" dia. hole with a passage length of not longer that 3/4". The well shall have a top flange to facilitate the installation of depth gauging equipment.

There shall be provided an approach section immediately upstream of the flume. The approach section shall have the same depth & width as the flume. The approach section shall have a length of______

The approach section shall be fabricated from the same materials as the flume and shall have the same standard of construction, surface finish and wall thickness as the flume.

The upstream end of the approach section shall have:

- A 2" wide flange along the sides and bottom which is to be embedded in concrete. (for in channel use)

- A fiberglass flat face pipe flange for ___"line size, with a bolt circle & diameter to match standard 125 lb. flange dimensions. (for pipelines)

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