Term

Definition
Specific Yield (unitless)
(water volume lost / total soil volume) 


Term

Definition
Ratio of volume water to volume total soil which drains under gravity. 


Term

Definition
approx. equal to effective porosity (ne) in unconfined aquifers. 


Term

Definition
Specific Retention
(volume water retained / total soil volume) 


Term

Definition
Ratio of the volume of water retained to total volume of soil. 


Term

Definition
Storativity of an unconfined aquifer
(water volume / area x change in head) 


Term

Definition
(~0.010.3, unitless) vol. of water an aquifer releases or intakes per unit surface area per change in head. 


Term

Definition
(~0.0010.00001, unitless) Storativity of a confined aquifer (aquifer thickness x specific storage) 


Term

Definition
Hydraulic Conductivity
(intrinsic permeability x (specific weight / dynamic viscosity)) 


Term

Definition


Term

Definition
Transmissivity
(hydraulic conductivity x aquifer thickness) 


Term

Definition


Term

Definition
Hydraulic Conductivity
(change in head between two points / length between two points) 


Term

Definition


Term

Definition
Saturation of oil
(1  unit water saturation) 


Term
STO = (A t φ R So) / FVF 5.615 

Definition
Recoverable stocktank oil (barrels) 


Term

Definition


Term

Definition
change in total storage of an aquifer (AcreFeetperYear AFY) 


Term

Definition
Change in aquifer storage input  output 


Term
Recoverable stocktank oil 

Definition
barrels
((area x thickness x porosity x recoverability factor x oil saturation) / (formation volume factor x 5.615)) 


Term

Definition


Term

Definition
difference of hydraulic head between two points (z1, z2). 


Term

Definition


Term

Definition
unitless %
void space volume / total volume 


Term
ne = (WsWr)/(WsWo) x (Vv/V)100 

Definition


Term

Definition
Groundwater flow (confined aquifer) 


Term
Groundwater flow (confined aquifer) 

Definition
ft/day or gpd/ft^2 Can solve with either hydraulic conductivity or transmissivity 


Term
Q = (1/2) K ((ha^2  hb^2)/l) l 

Definition
hydraulic flow in an unconfined aquifer 


Term

Definition
Groundwater seepage velocity 


Term
Groundwater seepage velocity 

Definition


Term

Definition


Term

Definition
210 low risk >11 high risk used to measure hazardous sodium in the soil 


Term
hardness = (Ca mg/L) + (Mg mg/L) x 50 

Definition


Term

Definition
Snell's Law of geophysical seismic wave refraction 


Term
t = x/V2 + ((2d√(V2^2  V1^2))/V1xV2) 

Definition
Snell's Law as a Two Layer problem; solving for time 


Term

Definition
Snells Law; two layer; calc. depth from graph ti = intercept time 


Term
d = √(V2V1) / (2√V2+V1) x Xcross 

Definition
Snell's Law; two layer problem; solving d calculate layer depth from graphical Xcross distance. 


Term
Cn = 1/√(σv)
Ncorrected = Cn x Nf 

Definition
Field correction factor Cn
σv represents effective overburden factor
Then field blow count x field correction factor to solve for Ncorrected 


Term

Definition
Transmissivity for timedrawdown graph ft^2/day or gpd/ft 


Term
S = T to / 640r^2 or S = T to / 4790r^2 

Definition
Storativity via transmissivity for timedrawdown graph. ft^2/day or gpd/ft 


Term

Definition
Transmissivity for depthdrawdown graph ft^2/day or gpd/ft 


Term
S = Tt/640ro^2 or S = Tt/4790ro^2 

Definition
Storativity via transmissivity for depthdrawdown graph. ft^2/day or gpd/ft 


Term

Definition
Well efficiency = theoretical drawdown/actual drawdown 


Term

Definition
calculating dry density = given density / 1 + water content 


Term
relative compaction = ρdry / ρmax 

Definition
calculating relative compaction of a soil w/ a given maximum dry density from a compaction curve 

