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Catalog:Environmental Flow Monitoring 
Global Water Adjust-A-Flume (AF Series) Global Water Adjust-A-Flume (AF Series) Description In today's resource conscious world, accurate measurement of water consumption is more important than ever. The Adjust-A-Flume fulfills this vital need. Manufactured of high quality galvanized steel for years of trouble-free service, the Adjust-A-Flume is the solution you have been looking for. Adjust-A-Flume measuring flumes are constructed from high quality galvanized steel and are available in three standard sizes to meet most applications. Adjust-A-Flume measuring flumes are sent unassembled for easy and economical shipping and handling. The flumes are easy to assemble in the field, and all bolts, nuts, and assembly instructions, are included. Unlike other measuring flumes currently on the market, the Adjust-A-Flume has a large, highly visible gauge mounted on both sides. It can be read easily from a distance of over 25 feet, facilitating roadside measurements. Durability The Adjust-A-Flume is designed with extremely rigid "flanged" construction. The unit also utilizes heavy cross bracing. The design allows the installation of the Adjust-A-Flume in locations with heavy soil backfill or in concrete channels. Installation Installation of the Adjust-A-Flume is quick and straight forward. Just assure that the flume is level both end to end, and side to side, and that the top of the fixed frame is 2 to 5 inches above the high water mark in the canal. Adjust the height of the sill, and the flume is ready for service. Unlike some other flume designs, the Adjust-A-Flume does not require sight surveying, or complicated excavation for proper and accurate installation. Features Direct-reading flow-rate gauges on the flume side walls, eliminating the need to carry a book of flow tables The ability to install the flume in canals without causing significant ponding Wide flow rate range Tolerance to various canal depths provided by the adjustable throat section. The system allows installation into flowing water without significantly disturbing the flow. This greatly reduces the visible ponding upstream of the measuring device, making them more acceptable to water users. Accuracy Extensive testing and evaluation under field and laboratory conditions have shown the Adjust-A-Flume to consistently achieve accuracy to within 3%, when properly installed. The increased flow velocity in the throat section discourages sediment accumulation in this important part of the flume. The approach section near the gauge, while somewhat less self-cleaning, is tolerant of considerable sediment accumulation before significantly altering the flume function. This produces long periods of time between required cleaning and maintenance. Measuring Flows in Earthen Canals By John A. Replogle Reprinted from the Irrigation Journal John Replogle is a research hydraulic engineer with the US Water Conservation Laboratory, Agricultural Research Service, USDA. Irrigation is seen by some as an environmental disaster to the earth. But placed in perspective with what might have been, we should remember that irrigated agriculture grows one-third of the total crop harvested. This irrigated harvest is produced on one-sixth of the world's crop land and is worth one-half of the crop value. Without irrigated agriculture, expansion of cropped land into humid areas would have been needed, and it is doubtful that the rainforests of the world would still exist. Even with this perspective, we have a long way to go to really make irrigation as efficient as it needs to be to continue to outpace the world's population bulge (expected to peak between 10 and 12 billion people) and still protect the environments of the world in a meaningful sense. The measurement of applied irrigation water is one of the major links in the efforts to improve irrigation management to achieve this needed efficiency. Earthen Canal Measurements: Canal flow measurements have been well served by the development of the long-throated flume. In canal flows, the water surface drop through a weir of flume is used to make a flow condition where the upstream depth indicates flow rate (eg gallons per minute.) In practice, for canal measurements, these flumes must be accurately positioned vertically o cause this needed water surface drop. If they are too high, the upstream canal may overflow. If they are too low, they will simply be a submerged object in the flow and will not function as a measuring device. This vertical placement is one of he most important field decisions and must be competently supervised to avoid costly refitting or improper function. Moreover, a common perception by many irrigation water users is that weirs and flumes significantly and harmfully restrict flow because of the observed ponding upstream of the flume or weir. These perceptions cause opposition to flow measurements and thwart proper irrigation water management. In actuality, proper size selection and installation reduce the possibility that flow is actually being obstructed. To address these perceptions and ease the vertical placement problem of flume installation in earthen canals, a flow-measuring flume called the "Adjust-A-Flume" is vertically adjusted after installation in the field. This vertical adjustment reduces ponding to the minimum for almost all flow rates. A mathematical model that was previously developed allows easy design of many sizes to match a variety of field situations. The reduction of ponding makes it more acceptable to users. These devices can measure flow rates in field ditches, lined and unlined canals, and sewer flows. Sizes available range from 200 gallons per minute, suitable for an intermediate-sized supply canal. Canal operators, researchers, and farm irrigators dealing in water management and water measurement in canal systems, both large and small, should find the Adjust-A-Flume a welcome addition to their group of flow measurement alternatives. Advantages of flumes: The adjustable flumes cause minimal upstream ponding, are theoretically-based, computer rated, and laboratory checked. They are highly accurate, cost effective, and are flexible in matching site requirements (Being adaptable to earthen or concrete lined canals.) They offer quick and easy installation in unlined canals. Sealing against water leakage is easily accomplished with compacted earth. Vertical placement problems are reduced or eliminated. Their operation is generally intuitive and easy for field technicians to learn. The computer ratings and design procedures for these flumes are transparent to the user. Because they cause small upstream ponding, usually less than one inch, they can be used in flatland farming areas. Direct reading sidewall gages eliminates the need to carry rating tables, or to calculate flow rates. Gages can usually be read from a vehicle on the canal bank. They can be adapted to changes in canal flow caused by weed growth or sedimentation in the canal by simply raising the sill slightly. Sediment can be flushed by simply raising the ramp to allow flow under the sill. They can be quickly readjusted when shifted because of freeze-thaw actions. Options and Prices Choosing the correct flume size for your application is important. We suggest using the smallest size flume that will accommodate your channel's flow. The Adjust-A-Flume is available in seven standard sizes, as shown below. Flow Rate (cfs) Shipping Weight Part Number Price 0.45 26 lbs AF0.45 $235 2 CFS 82 lbs AF2 $425 4 CFS 108 lbs AF4 $565 6 CFS 133 lbs AF6 $650 11CFS 412 lbs AF11 $1297 15CFS 537 lbs AF15 $1600 35 CFS 810 lbs AF35 $2600 We recommend using the Water Level Logger Flume and Weir Stick Option (WL14x FWS) with the Adjust-A-Flume. Please select from the menu below
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