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RECORDING WATER TABLE DYNAMICS T & D Project No. 1E11EM35. Setup, Installation, Comparison. USDA FOREST SERVICE Technology & Development Center 444 East Bonita Avenue San Dimas, CA 91773. Setup and Installation Materials. Well screen and point suitable for soil type
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Setup, Installation, Comparison
USDA FOREST SERVICE
Technology & Development Center
444 East Bonita Avenue
San Dimas, CA 91773
An effective well screen is essential for accurate water table measurements. This provider determined appropriate screen size based on a description of the soil type.
Brady Products, Inc.
2151 Logan St. P.O. Box 5304
Clearwater, FL 34618
Toll free (800) 237-6900
Florida (800) 282-6900
380 S. Reading Ave. (Rear)
Boyertown, PA 19512-1812
Fax (610) 367-8435
-Padlocks and keys available from same supplier
The caps received required some grinding to remove burrs left over from casting.
All units tested are compatible with 2” well diameters.
Ordering options generally include various cable lengths.
All cables can be shortened considerably by winding extra cable around a ½” diameter stick at the top of the well (see next slide).
The InSitu sensor is the only sensor that can be detached from its cable in the field. This allows the installer to carry several cable lengths for one sensor when water table depths are not known before installation. This reduces the need to wrap cable.
Sensors must be suspended above the bottom of the well. Pipes frequently need to be driven several feet below the water table to allow accurate measurement at greatest depth.
The unique suspending collar installed on the In-Situ cable required an alternative installation to allow later retrieval without destroying the well. The plastic locking well cap provided with the unit inspired little confidence in the unit’s security, though the company is interested in providing metal locking caps on demand.
Notice the two locks necessary to allow nondestructive removal of the In-Situ unit (left). The Sutron logger head (center) requires the tallest well stack to allow measurements up to ground level. The Global requires a considerably shorter stack, and the In-Situ would require nearly no stack (and only one lock) if the cable was not coiled inside. Coiled cable and cable ends must be suspended above the highest possible water level.
Global Water WL15
No pressure compensation
Stevens SDI-12 Depth Sensor
Logging option not designed for 2” well
Vadoscan water level sensor
Inadequate memory2-Inch Well Compatible Equipment
This is not a comprehensive listing. The above products are a sampling of those commercially available at the time of the project market search.