Shields number
A dimensionless ratio quantifying stream competence or a stream flow's capacity to mobilize bed particles of a given size
active groundwater circulation depth
The depth below which the total annual groundwater flux is a sufficiently small fraction of the annual watershed hydrologic budget that its exclusion from watershed numerical models has a negligible i...
annual ET
backward cumulative TTD
conductivity
Water electrical conductivity that increases as solutes concentrate during pond drying
consumptive water use
The fraction of water that was originally withdrawn from a source for irrigation and is subsequently removed from availability owing to evaporation, transpiration, or incorporation into crops
delivery reductions
deuterium-excess
Metric defined as d-excess = δ²H - 8·δ¹⁸O, indicative of non-equilibrium conditions during evaporation and sublimation processes
dissolved noble gases
diversions
effective porosity
The fraction of pore volume in rock that contributes to fluid flow, excluding isolated or dead-end pores
end member contributions
green water
grey water
gridded meteorological forcing
Spatially and temporally distributed weather data products that provide precipitation, temperature, and other meteorological variables on regular grids for model input
infiltration capacity
The maximum rate at which water can enter soil under specified conditions
interception rates
modern residence times
pore volume
Volume of void space in a column, used to normalize flow-through time in column experiments
quantitative precipitation estimate
Estimates of precipitation amount derived from radar and other observational data
sap velocity
Rate of water movement through tree xylem measured using thermal dissipation methods
shear velocity
shortage declaration
snow-covered area mapping
Remote sensing technique to identify and quantify spatial extent of snow cover using satellite imagery
soil thickness
Depth of mobile regolith layer from land surface to bedrock contact, controlling water, carbon, and nutrient dynamics
specific differential phase
Range derivative of the propagational component of differential phase shift, intrinsically dependent on particle size and number concentration