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AN INEXPENSIVE WEIR AND PROPORTIONAL SAMPLER FOR MINIATURE WATERSHED ECOSYSTEMS1 |
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| Authors: | J.V. Nabholz D. A. Crossley Jr. G. R. Best |
| Affiliation: | 1. Office of Toxic Substances (TS - 796), U.S. Environmental Protection Agency, 401 M Street, S.W., Washington, D.C.;2. Department of Entomology, University of Georgia, Athens, Georgia 30602;3. Center for Wetlands, Phelps Laboratory, University of Florida, Gainesville, Florida 32601. |
| Abstract: | ABSTRACT A weir system with a proportional sampler for use on miniature watershed ecosystems is described. Eight weir collection systems were evaluated for their ability to measure and sample inputs and outputs of soil-island ecosystems which occur on granite outcrops. The proportion of water actually collected by the weir systems was generally less than the proportion the systems were designed to sample, but adequate for supplying data needed for estimating elemental budgets. The weir systems were not able to account for 25 to 50 percent of the variation in total water passing over the cutoff wall. Several ways of improving overall performance of the weir systems are discussed. |
| Keywords: | weir proportional sampler input-output budget granitic outcrop |