# Diagnostic Flow Plots

Only AQTESOLV provides a set of powerful **diagnostic plots** that aid in the selection of appropriate aquifer models and solutions methods for your pumping test data.

**Diagnostic plots** display field data on transformed axes and help you to identify important *flow regimes* such as

- infinite-acting radial flow
- wellbore storage
- fracture flow
- channel flow
- spherical flow

A key diagnostic on these plots is the identification of **unit (1:1) slopes** on double-logarithmic (log-log) axes.

## Radial Flow Plots

**Radial flow plots** are useful diagnostic tools for identifying *infinite-acting radial flow conditions*, *wellbore storage* and *closed aquifer behavior*.

- On a semi-log radial flow plot, late-time data exhibiting a straight line are indicative of
.*radial flow conditions in an infinite-acting aquifer* - On a log-log radial flow plot, early-time data exhibiting a unit slope are indicative of
, an important flow regime to consider in the interpretation of single-well tests (Figure 1).*wellbore storage* - On a log-log radial flow plot, late-time data exhibiting a unit slope are indicative of a
(an aquifer enclosed by no-flow boundaries).*closed aquifer*

## Linear Flow Plots

**Linear flow plots** are useful diagnostic tools for identifying linear flow behavior in *single fractures* and *channel aquifers*. The linear flow plot transforms the time scale by its square root.

- On a log-log linear flow plot, early-time data exhibiting a unit slope are indicative of linear flow conditions to a
.*single fracture with infinite conductivity or uniform flux along the fracture* - On a log-log linear flow plot, late-time data exhibiting a unit slope are indicative of
.*linear flow in a channel aquifer*

## Bilinear Flow Plots

**Bilinear flow plots** are useful diagnostic tools for identifying *fracture flow behavior*, *flow in
dikes* or *flow in a channel aquifer with permeable walls*.

- On a log-log bilinear flow plot, early-time data on exhibiting a unit slope are indicative of bilinear flow to a
.*single fracture with finite conductivity* - On a log-log bilinear flow plot, late-time data exhibiting a unit slope are indicative of
or*bilinear flow in a permeable dike surrounded by less permeable country rock*.*linear flow in a channel aquifer with permeable walls*

## Spherical Flow Plots

**Spherical flow plots** are useful diagnostic tools for identifying spherical flow conditions such as may occur in the vicinity of a *partially penetrating well*.

- On a linear spherical flow plot, data exhibiting a negative unit slope are indicative of
.*spherical flow conditions*