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A Low-Cost Composite Water Sampler for Drip and Stream Flow

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  022148,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10407) @2002
Authors:   R. W. Malone, J. V. Bonta, D. Lightell
Keywords:   Hydrologic instrumentation, water quality, flow-weighted, flow-proportional

The collection of flow-proportional samples when flow rates range from slow drip flow to slow stream flow is important in hydrology. A rotating slot sampler was modified for this purpose and its field and lab performance were monitored. The major design criteria include: function for flow rates between 0.5 and 200 mL/min; minimize sampler-fraction variance between trials; allow total flow volume estimate from sampler-fraction volume; compact in size; useful in remote conditions; low-cost; low-maintenance; and easily constructed from readily obtainable materials. The designed sampler collected approximately 2.0% of total flow (sampler-fraction) with a sampler-fraction coefficient of variation between trials of less than 5%. This allows total flow to be estimated and flowproportional samples for water quality analysis to be collected.

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