Term

Definition
Structure of subsurface porous material in reference to the flow of groundwater 


Term

Definition
Measure of the empty space in a material (n) Primary: Matrix Duel: Fissures Triple: Conduits/channels 


Term
Permeability (primary and secondary) 

Definition
Ability of porous material to allow fluids to pass through (k) Primary: Fluid moving through grains of material Secondary: Gaps formed later (fissures or channels) 


Term

Definition
How thick an aquifer is (b). Because we assume isotropic and homogenous, we try and pick a thickness with the same characteristics. Sometimes that means the thickness is only as thick as one fissure in the bedrock 


Term

Definition
Describes how easily water can move through a material (K) 


Term

Definition
How much water can pass horizontally through an aquifer (T=K*b) 


Term

Definition
Amount of water unit volume that can be removed per unit drop in head (Ss) 


Term

Definition
Amount of water in the aquifer that can be removed per unit drop in head (S=Sds*b) 


Term

Definition
Water that gets into the ground 


Term

Definition
Water that makes it to the water table 


Term

Definition
The avg amount of time a substance (chemical) spends in a certain reservoir 


Term

Definition
Ca, Mg, Na, SiO2 Less total dissolved solids, silicate minerals weather slowly More variety of ions Important buffering system 


Term
Carbonate Water Chemistry 

Definition
Ca, Mg, HCO3 High total dissolved solids Carbonate weathers easily 


Term

Definition
H2 (deuterium) O17 and 18 C13 N15 S33, 34, and 36 


Term

Definition


Term
Groundwater flow Steady State Equation Transient State Equation 

Definition
Steady State: d^2h/dx^2+d^2h/dy^2+d^2h/dz^2=0
Transient State: d^2h/dx^2+d^2h/dy^2+d^2h/dz^2=Ss(dh/dt)/k 


Term

Definition
Single well, steady state, hydraulic head can be calculated for any distance from the well if boundary conditions, Q, K, and b are known h=(Q/2(pi)Kb)ln(r/R)+hnaught
Q is pumping rate r is radius from pumping well hnaught is original water level h is current water level b is aquifer thickness K is hydraulic conductivity R is radius from well that is affected by pumping 


Term

Definition
Transient flow drawdown with multiple wells s=(Q/4(pi)T)(0.577ln(u)+uu^2/4+u^3/18.....
s is drawdown Q is pumping rate T is transmissivity
u=(r^2S)/(4Tt) S is storativity 


Term
Cooper Jacob approximation 

Definition
s=(Q/4(pi)T)(0.577ln(u)
Simplified. If u is small enough the rest of equation doesn't matter. For u to be small, radius must be small and time must be large 


Term

Definition
Factories, wastewater treatment plants, abandoned mines, landfills, Storage Tanks 


Term
Nonpoint Source Pollutants 

Definition
Agriculture, Lawns/Gardens, Street refuse, Construction 


Term

Definition
Shows what type of rock the aquifer is located in 


Term

Definition


Term
Fluid resistivity/conductivity and fluid temp log 

Definition
Measures total dissolved solids (how conductive water is) and the temperature of the water 


Term

Definition
How the water is flowing in the well Slight slope indicates some flow Flat line indicates fissure of some sort with lots of flow 


Term

Definition
Constant rate of recharge straight down 


Term

Definition


Term

Definition
Well pumping at a steady rate Steady state of recharge 


Term
Finite difference approx for hydraulic head 

Definition
Hydraulic head=Average of the four surrounding nodes (think excel for numeric modeling) 

