Term
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Definition
Specific Yield (unitless)
(water volume lost / total soil volume) |
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Term
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Definition
| Ratio of volume water to volume total soil which drains under gravity. |
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Term
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Definition
| approx. equal to effective porosity (ne) in unconfined aquifers. |
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Term
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Definition
Specific Retention
(volume water retained / total soil volume) |
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Term
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Definition
| Ratio of the volume of water retained to total volume of soil. |
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Term
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Definition
Storativity of an unconfined aquifer
(water volume / area x change in head) |
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Term
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Definition
(~0.01-0.3, unitless)
vol. of water an aquifer releases or intakes per unit surface area per change in head. |
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Term
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Definition
(~0.001-0.00001, unitless)
Storativity of a confined aquifer
(aquifer thickness x specific storage) |
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Term
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Definition
Hydraulic Conductivity
(intrinsic permeability x (specific weight / dynamic viscosity)) |
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Term
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Definition
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Term
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Definition
Transmissivity
(hydraulic conductivity x aquifer thickness) |
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Term
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Definition
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Term
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Definition
Hydraulic Conductivity
(change in head between two points / length between two points) |
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Term
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Definition
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Term
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Definition
Saturation of oil
(1 - unit water saturation) |
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Term
| STO = (A t φ R So) / FVF 5.615 |
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Definition
| Recoverable stock-tank oil (barrels) |
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Term
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Definition
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Term
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Definition
change in total storage of an aquifer
(AcreFeetperYear AFY) |
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Term
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Definition
Change in aquifer storage
input - output |
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Term
| Recoverable stock-tank oil |
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Definition
barrels
((area x thickness x porosity x recoverability factor x oil saturation) / (formation volume factor x 5.615)) |
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Term
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Definition
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Term
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Definition
| difference of hydraulic head between two points (z1, z2). |
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Term
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Definition
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Term
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Definition
unitless %
void space volume / total volume |
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Term
| ne = (Ws-Wr)/(Ws-Wo) x (Vv/V)100 |
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Definition
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Term
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Definition
Groundwater flow
(confined aquifer) |
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Term
| Groundwater flow (confined aquifer) |
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Definition
ft/day or gpd/ft^2
Can solve with either hydraulic conductivity or transmissivity |
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Term
| Q = (-1/2) K ((ha^2 - hb^2)/l) l |
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Definition
| hydraulic flow in an unconfined aquifer |
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Term
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Definition
| Groundwater seepage velocity |
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Term
| Groundwater seepage velocity |
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Definition
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Term
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Definition
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Term
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Definition
2-10 low risk
>11 high risk
used to measure hazardous sodium in the soil |
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Term
| hardness = (Ca mg/L) + (Mg mg/L) x 50 |
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Definition
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Term
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Definition
| Snell's Law of geophysical seismic wave refraction |
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Term
| t = x/V2 + ((2d√(V2^2 - V1^2))/V1xV2) |
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Definition
| Snell's Law as a Two Layer problem; solving for time |
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Term
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Definition
Snells Law; two layer; calc. depth from graph
ti = intercept time |
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Term
| d = √(V2-V1) / (2√V2+V1) x Xcross |
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Definition
| Snell's Law; two layer problem; solving d calculate layer depth from graphical Xcross distance. |
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Term
Cn = 1/√(σv)
Ncorrected = Cn x Nf |
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Definition
Field correction factor Cn
σv represents effective overburden factor
Then field blow count x field correction factor to solve for Ncorrected |
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Term
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Definition
Transmissivity for time-drawdown graph
ft^2/day
or
gpd/ft |
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Term
S = T to / 640r^2
or
S = T to / 4790r^2 |
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Definition
Storativity via transmissivity for time-drawdown graph.
ft^2/day
or
gpd/ft |
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Term
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Definition
Transmissivity for depth-drawdown graph
ft^2/day
or
gpd/ft |
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Term
S = Tt/640ro^2
or
S = Tt/4790ro^2 |
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Definition
Storativity via transmissivity for depth-drawdown graph.
ft^2/day
or
gpd/ft |
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Term
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Definition
| Well efficiency = theoretical drawdown/actual drawdown |
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Term
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Definition
| calculating dry density = given density / 1 + water content |
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Term
| relative compaction = ρdry / ρmax |
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Definition
| calculating relative compaction of a soil w/ a given maximum dry density from a compaction curve |
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