. Cranberries; : the national cranberry magazine. Cranberries. "Watermark" Detects Low-lying Water The "Watermark"TM is a cylin- drical tube used in open ditch irrigation to detect low-lying water. Also used as an early warning of flood control. Enables fields to be monitored continually from one location. Developed by the Weldon Instru- ment Company, of Burbank Calif., the patented "Watermark"TM sig- naling unit shows exactly how water is running in irrigation ditches without having to visually inspect the ditches. Field tests have shown that a signal from a Wate
. Cranberries; : the national cranberry magazine. Cranberries. "Watermark" Detects Low-lying Water The "Watermark"TM is a cylin- drical tube used in open ditch irrigation to detect low-lying water. Also used as an early warning of flood control. Enables fields to be monitored continually from one location. Developed by the Weldon Instru- ment Company, of Burbank Calif., the patented "Watermark"TM sig- naling unit shows exactly how water is running in irrigation ditches without having to visually inspect the ditches. Field tests have shown that a signal from a Water- markTM unit is clearly visible over 200 yards away. According to the manufacturer, the use of this device helps elimin- ate overflooding or lack of water in irrigation areas. A farmer normally estimates the amount of water required for sufficient irrigation, then releases that amount of water. As a result, due to unseen circumstances, the water may not run its full course, either flooding certain areas and wasting water, or letting some of his crops receive little or no water. This tubular instrument, highly effective and relatively trouble-free, 12 is merely inserted into the ground at the end of an irrigation ditch. As the water runs the length of the ditch and enters into the Water- mark'sTM base, an inner float is raised, releasing an easily seen brilliantly fluorescent red flag at the top. This signifies that the ditch is being sufficiently irrigated. This device is portable and may be moved from one ditch to another and installation time is about 30 seconds. With WatermarkTM units placed around the borders or at the end of each ditch, a farmer can look down the rows, from more than 500 yards away, and instantly know if his crops have been fully irrigated. And, he can do this without wasting hours tramping through muddy fields. WatermarksTM are available in three different heights. Model 715 Backhoe Precision handling, compactness and economy are three of the features m
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