This paper introduces a graphical user interface (GUI) for the R software that allows the rainfall-runoff relationship to be calculated, using the curve number method. This GUI is a raster-tool whose outputs are runoff estimates calculated using land use/land cover and hydrologic soil group maps. The package allows the user to select among three different antecedent moisture conditions and includes modifications about the initial abstraction parameter. We tested this GUI with data derived from two watersheds in Mexico and the outputs were compared with those produced using a well-established GIS tool in a vector environment. The results produced by these two approaches were practically the same. The main advantages of our package are: (1) ‘Sara4r’ is faster than previous vector based tools; (2) it is easy to use, even for people with no previous experience using R; (3) the modular design allows the integration of new routines; and (4) it is free and open source.

本文介绍了用于R软件的图形用户界面（GUI），该软件允许使用曲线编号方法来计算降雨与径流的关系。该GUI是一种栅格工具，其输出是使用土地利用/土地覆盖和水文土壤群图计算的径流估计值。该软件包允许用户在三个不同的先行湿度条件中进行选择，并包括有关初始提取参数的修改。我们使用来自墨西哥两个流域的数据测试了此GUI，并将输出与使用矢量环境中使用完善的GIS工具生成的输出进行了比较。这两种方法产生的结果实际上是相同的。我们软件包的主要优点是：（1）' Sara4r'比以前的基于矢量的工具更快；（2）即使对于没有使用R经验的人，它也易于使用；（3）模块化设计允许集成新的例程；（4）它是免费和开源的。