Water terms starting with Z

9 terms

1. Z/R Relationship The empirical conversion relationship between radar reflectivity and precipitation rate.
2. Zero air voids curve The curve showing the relationship between dry unit weights and corresponding moisture contents, assuming that all of the voids are completely filled with…
3. Zero Datum A reference "zero" elevation for a stream or river gage. This "zero" can be referenced (usually within ten feet of the bottom of the channel) to mean sea…
4. Zone of Aeration The comparatively dry soil or rock located between the ground surface and the top of the water table.
5. Zone of Saturation The soil or rock located below the top of the ground water table that is saturated with water. See water table.
6. Zoned earthfill (or zoned embankment) An embankment dam composed of zones of selected materials where the permeability of the material increases to the upstream or downstream face from the…
7. Zoned Embankment Dam An embankment dam, which is composed of zones of selected materials having different degrees of porosity, permeability, and density.
8. Zoning The ability of local governments to specify the use of private property in order to control development within designated areas of land.
9. Zooplankton Animals (mostly microscopic) that drift freely in the water column.