# Constant-Head Test Analysis

**Constant-head test analysis**is one of the many features not found in competing aquifer test software.

"I chose AQTESOLV for its ease of use."

--**David Preston, P.E., Peachtree Environmental**

AQTESOLV includes an *advanced* set of solution methods for the interpretation of data from
constant-head tests in *confined*, *leaky confined* and *fractured* aquifers. Constant-head tests are alternately known as **constant-drawdown** tests.

- analyze discharge from constant-head test
- analyze recovery data with
*exact*solution for change in boundary condition

## Summary of Constant-Head Test Solutions

Summary of Constant-Head Test Solutions in AQTESOLV Pro | |

Solution Category | Methods Available |

Constant-Head Tests | 11 |

Recovery Tests | 10 |

Wellbore Skin | 6 |

Confined Aquifers | 5 |

Leaky Aquifers | 2 |

Fractured Aquifers | 4 |

Compare constant-head test solutions in the **Pro** and **Standard** versions.

## Constant-Head (Constant-Drawdown) Analysis

AQTESOLV features solution methods for the analysis of constant-head tests. During a constant-head test, the water level in the test well is held constant while discharge declines through time. If the water level is lowered from static during the test, the term *constant-drawdown test* is applicable.

## Recovery Analysis

Interpretation of recovery data obtained after a constant-head test requires special analytical techniques because of the change in boundary condition from constant head to constant rate (during recovery, the discharge is zero and the water level in the test well returns to static).

AQTESOLV features an * exact method* for analyzing these recovery tests. You may use residual drawdown plots (Figure 2) or the Agarwal method to analyze recovery data from a constant-head test.

* See also:* constant-head tests