Symbol

Explanation

Dimension

A

Yintercept of
straight line (for straightline method)


a

hydraulic
diffusivity

m2/d

az

hydraulic
diffusivity in vertical direction

m2/d

B

leakage
factor

m

C

slope (for
straightline method)


D

vertical
distance between axes observation plot and type curve plot


d

distance between
pumping and observation well screen centers

m

E

horizontal
distance between axes of observation plot and type curve
plot


f1,
f2

drawdown
function values in the first and second observation wells (for
method of bisecting line)


k

hydraulic
conductivity

m/d

kr

hydraulic
conductivity in horizontal direction

m/d

kz

hydraulic
conductivity in vertical direction

m/d

L

strip aquifer
width

m

Lp

horizontal
distance from observation well to the boundary

m

Lw

horizontal
distance from pumping well to the boundary

m

lp

observation well
screen length

m

lw

pumping well
screen length

m

M(u,
β)

special
function


m

aquifer
thickness or initial water saturated thickness of unconfined
aquifer (distance from aquifer bottom to water table)

m

N

number of
pumping wells


n

number of
reflections from one boundary



number of rate
steps in the ith well at jth rate step


Q

rate of pumping
well

m3/d


jth step rate
value in the ith pumping well

m3/d

r

horizontal
distance between pumping and observation wells

m


radius of
pumping well casing

m

rw

radius of
pumping well

m

S

storage
coefficient

Dimensionless

Ss

specific
storage

1/m

Sy

specific
yield

Dimensionless

s

drawdown
(recovery)

m

s0

drawdown in the
well at shutin

m


initial
(instantaneous – for slug test) drawdown in the pumping well

m

sm

drawdown at
steadystate

m

sr

recovery counted
off from shutin water level

m


drawdown in the
pumping well

m

T

transmissivity

m2/d

t

time

d

t0

duration of
pumping

d

tr

time since
recovery started

d


time when jth
rate step in the ith pumping well started

d

u

function
argument


W(u)

well
function


W(u,
β)

leaky aquifer
function


z

vertical
distances: to aquifer top, to bottom to image well etc; for
partially penetrating wells: vertical distance between observation
and pumping well screen centers

m

β

function
argument


ΔL

retardation
coefficient

m

ρ

horizontal
distance between observation and image wells

m

χ

anisotropy
ratio

Dimensionless

τ

variable of
integration

