English for Science & Nature Glossary of Terms - Y

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yard waste - The part of solid waste composed of grass clippings, leaves, twigs, branches, and other garden refuse.

yellow-boy - Iron oxide flocculant (clumps of solids in waste or water); usually observed as orange-yellow deposits in surface streams with excess iron content. (See: floc, flocculation.)

yield - The quantity of water (expressed as a rate of flow or total quantity per year) that can be collected for a given use from surface or groundwater sources