Artesian aquifers offer interesting opportunities for water supply by providing a low-vulnerability groundwater resource that is easily abstracted without any installation of pumps or power supply costs. However, hydraulic tests are challenging to perform, notably where the piezometric head is above ground level with free-flowing wells not equipped with valves and open for years. This paper describes a low-cost, easy to reproduce and adaptable device, the free-flowing artesian well device (FFAWD), which is mainly designed with a set of PVC tubes equipped with a pressure probe and a valve. This device is used to perform hydraulic tests on free-flowing artesian wells, to measure the piezometric head of the aquifer and to compute its transmissivity. The practical use of the FFAWD is described and a method is proposed to compute the piezometric head and the transmissivity of the aquifer from this data set (free-flowing well discharge and pressure increase measurements) with any adapted analytical solution, using the Houpeurt-Pouchan method. Artefacts such as post-production effects, surge effects, and the impact of a leaky well are identified to avoid any misinterpretation. The FFAWD was applied to the volcano-sedimentary artesian plain of Pasuruan (Indonesia). The advantages and limitations of using the device, along with the interpretation methodology, are also discussed.

自流含水层为供水提供了有趣的机会，因为它提供了一种低脆弱性的地下水资源，无需安装任何泵或供电成本即可轻松提取。然而，水力测试具有挑战性，特别是在测压头高于地面且没有配备阀门且多年开放的自由流动井的情况下。本文介绍了一种低成本、易于复制和适应性强的装置，即自由流动自流井装置 (FFAWD)，该装置主要设计有一组 PVC 管，配有压力探头和阀门。该设备用于对自由流动的自流井进行水力测试，测量含水层的测压头并计算其透水率。描述了 FFAWD 的实际应用，并提出了一种使用 Houpeurt-Pouchan 从该数据集（自由流动的井流量和压力增加测量）和任何合适的解析解计算含水层的测压头和渗透率的方法方法。识别诸如后期生产效应、浪涌效应和漏井影响等伪影，以避免任何误解。FFAWD 应用于 Pasuruan（印度尼西亚）的火山沉积自流平原。还讨论了使用该设备的优点和局限性，以及解释方法。识别诸如后期生产效应、浪涌效应和漏井影响等伪影，以避免任何误解。FFAWD 应用于 Pasuruan（印度尼西亚）的火山沉积自流平原。还讨论了使用该设备的优点和局限性，以及解释方法。识别诸如后期生产效应、浪涌效应和漏井影响等伪影，以避免任何误解。FFAWD 应用于 Pasuruan（印度尼西亚）的火山沉积自流平原。还讨论了使用该设备的优点和局限性，以及解释方法。