The empirical conversion relationship between radar reflectivity and precipitation rate.
- Browse Related Terms: ADVIS, API Method, Base Width, Composite Hydrograph, Headwater Advisory Program (ADVIS), Instantaneous Unit Hydrograph, Mass Curve, Precipitation Processing System, Probable maximum precipitation (PMP), Recession Constant, Z\/R Relationship
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The curve showing the relationship between dry unit weights and corresponding moisture contents, assuming that all of the voids are completely filled with water.
- Browse Related Terms: Atterberg limits (consistency limits), Bentonitic clay (bentonite), Clay, Compaction curve (Proctor curve, moisture-density curve), Compaction test, Flow curve, Liquid limit (LL), Moisture content (water content), Optimum moisture content, or Optimum water content, Plastic limit, Shrinkage index (SI), Shrinkage ratio (R), Volumetric shrinkage, Zero air voids curve
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 level, or to any other recognized datum.
- Browse Related Terms: Backwater Flooding, Contracted weir, Cross-sectional area, Diversion, Drainage Density, Energy dissipator, Ephemeral creek, Flume, Gradient, Incised stream, Instream flow requirements, Length, Mean Depth, Meander, Natural Control, Net Rainfall, Outflow Channel, Outlet channel (exit channel), Reach, Rill, River System, Scour, stream, Stream capacity, Streamflow, Thalweg, Wetted perimeter, Zero Datum
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The locus of points just above the water table where soil pores may either contain air or water. This is also called the vadose zone.
The comparatively dry soil or rock located between the ground surface and the top of the water table. The zone of aeration is not saturated with water because its pores are filled partly by air and partly by water.
- Browse Related Terms: Ground water, Perched Groundwater, Phreatic water, Phreatic Zone, Saturated zone, Semipervious zone., Unsaturated zone, Uplift pressure, Vadose Zone, Water table, Zone of Aeration, Zone of saturation
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The soil or rock located below the top of the ground water table that is saturated with water. See water table.
The locus of points below the water table where soil pores are filled with water. This is also called the phreatic zone.
- Browse Related Terms: Ground water, Perched Groundwater, Phreatic water, Phreatic Zone, Saturated zone, Semipervious zone., Unsaturated zone, Uplift pressure, Vadose Zone, Water table, Zone of Aeration, Zone of saturation
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An embankment dam composed of zones of selected materials where the permeability of the material increases to the upstream or downstream face from the relatively impermeable core material.
- Browse Related Terms: Compacted embankment, Core (impervious core or impervious zone), Diaphragm-type earthfill, Earth dam (earthfill dam), Earthen (or Earthfill) Dam, Embankment, Homogeneous earthfill dam, Homogeneous Rolled Earth Dam, Hydraulic fill dam, Industrial waste dam, Pervious Zone, Revetment, riprap, Rock Fill Dam, Rockfill Dam, Rolled Earth Dam (Earth Fill or Earth Dam), Rolled fill dam, Rolled Filled Dam, Roller-compacted concrete dam, Toe weight, Transition zone (semipervious zone), Weighting of a slope, Zoned earthfill (or zoned embankment), Zoned Embankment Dam
An embankment dam, which is composed of zones of selected materials having different degrees of porosity, permeability, and density.
An embankment dam which is comprised of zones of selected materials having different degrees of porosity, permeability and density.
- Browse Related Terms: Compacted embankment, Core (impervious core or impervious zone), Diaphragm-type earthfill, Earth dam (earthfill dam), Earthen (or Earthfill) Dam, Embankment, Homogeneous earthfill dam, Homogeneous Rolled Earth Dam, Hydraulic fill dam, Industrial waste dam, Pervious Zone, Revetment, riprap, Rock Fill Dam, Rockfill Dam, Rolled Earth Dam (Earth Fill or Earth Dam), Rolled fill dam, Rolled Filled Dam, Roller-compacted concrete dam, Toe weight, Transition zone (semipervious zone), Weighting of a slope, Zoned earthfill (or zoned embankment), Zoned Embankment Dam
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Identification of areas of specified uses or restrictions.
A process in which a marine protected area is divided into discrete zones each permitting and regulating specific human activities through conditions such as gear limitations in fishing and waste discharge prohibitions in tourism. In the United States, some marine sanctuaries, national parks, national wildlife refuges, and state MPAs are examples of areas that may be zoned.
- Browse Related Terms: Avoid Harm, Ecological Network, Lasting, National System of MPAs, Network of MPAs, Prior appropriation, Protection, Refuge compatibility requirements, Reserved, Sustainable Production, Zoning
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Small, usually microscopic animals (such as protozoans), found in lakes and reservoirs.
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