segment, and record coordinates of matching point

where

r = distance from test well to observation

(fig. C-8).

piezometer, feet

S = coefficient of storage

thus determined, compute S and T' from equations

t' = elapsed pumping time in days

(C-3) and (C-4).

The formation constants can be obtained approximate-

ly from the pumping test data using a graphical meth-

(square feet per minute)

(C-5)

od of superposition, which is outlined below.

T'

known as a "type-curve," using table C-1 as in figure

k=

(feet per minute)

(C-6)

10,770D

C-8.

(2) Method 2. This method can be used as an ap-

proximate solution for nonequilibrium flow to a well to

graph paper of same size as the type-curve in figure

avoid the curve-fitting techniques of method 1 by

C-8.

using the techniques outlined below,

type-curve, keeping coordinates axes of the two curves

graph as in figure C-9.

parallel, and adjust until a position is found by trial

whereby most of the plotted data fall on a segment of

down curve, and note coordinates t and H-h.

the type-curve as in figure C-8.

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