Single-borehole dilution tests (SBDTs) are a method for characterizing groundwater monitoring wells and boreholes, and are based on the injection of a tracer into the saturated zone and the observation of concentration over depth and time. SBDTs are applicable in all aquifer types, but especially interesting in heterogeneous karst or fractured aquifers. Uniform injections aim at a homogeneous tracer concentration throughout the entire saturated length and provide information about inflow and outflow horizons. Also, in the absence of vertical flow, horizontal filtration velocities can be calculated. The most common method for uniform injections uses a hosepipe to inject the tracer. This report introduces a simplified method that uses a permeable injection bag (PIB) to achieve a close-to-uniform tracer distribution within the saturated zone. To evaluate the new method and to identify advantages and disadvantages, several tests have been carried out, in the laboratory and in multiple groundwater monitoring wells in the field. Reproducibility of the PIB method was assessed through repeated tests, on the basis of the temporal development of salt amount and calculated apparent filtration velocities. Apparent filtration velocities were calculated using linear regression as well as by inverting the one-dimensional (1D) advection-dispersion equation using CXTFIT. The results show that uniform-injection SBDTs with the PIB method produce valuable and reproducible outcomes and contribute to the understanding of groundwater monitoring wells and the respective aquifer. Also, compared to the hosepipe method, the new injection method requires less equipment and less effort, and is especially useful for deep boreholes.

单孔稀释测试（SBDT）是表征地下水监测井和井眼的一种方法，其基于将示踪剂注入饱和区并观察深度和时间上的浓度。SBDT适用于所有类型的含水层，但对于非均质的岩溶或裂隙含水层尤为有趣。均匀注入的目标是在整个饱和长度内均匀分布示踪剂，并提供有关流入和流出层位的信息。同样，在没有垂直流的情况下，可以计算出水平过滤速度。均匀注入的最常见方法是使用软管通过示踪剂注入。该报告介绍了一种简化的方法，该方法使用可渗透注入袋（PIB）在饱和区域内实现接近均匀的示踪剂分布。为了评估新方法并确定优点和缺点，已在实验室和现场的多个地下水监测井中进行了一些测试。PIB方法的重现性是根据盐量的随时间变化和计算出的表观过滤速度通过反复测试进行评估的。使用线性回归以及使用CXTFIT反转一维（1D）对流扩散方程来计算表观过滤速度。结果表明，采用PIB方法均匀注入的SBDT可以产生有价值且可重现的结果，并有助于理解地下水监测井和相应的含水层。而且，与软管法相比，新的注入法所需的设备更少，工作量也更少，