Galvanized Steel H Flumes are an economical alternative to standard fiberglass construction. Galvanized Steel H Flumes are commonly used to measure irrigation, surface water, and runoff flows.
Galvanized Steel Advantages
The heavy gauge construction of Openchannelflow galvanized steel H flumes provide good damage resistance. In irrigation / water rights applications this can be useful, particularly when cattle or other livestock may be in / around the flume.
Galvanized steel H flumes are economical - generally being the least expensive H flume material. The cost difference between galvanized steel and fiberglass H flumes is not as great, though, as with Parshall flumes.
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Galvanized Steel Disadvantages
While galvanized steel H flumes have a number of advantages, it is important to remember that there are several disadvantages to the material.
Galvanized steel H flumes weigh more twice as much as their fiberglass counterparts - on average ~5 lbs/ft2 [24.4 kg/m2]. This increased weight means that more manpower / heavier duty equipment is typically needed to install the flume. Additionally, the added weight means that galvanized steel H flumes are not generally used in remote watershed applications unless damage resistance is needed.
The surface galvanization on the flumes can be abraded by heavy / sharp sediments in the flow stream. In applications where these are present their will be a need for ongoing maintenance of the galvanization or a different flume material (typically stainless steel) should be used.
Depending upon the application, the galvanized surfaces of the flume may present an ongoing maintenance issue. Where the hot dipped galvanization has been worn away, the surface must be dried, cleaned, and the cold galvanization applied.