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Abstract. In recent decades, advances in the flexibility and complexity of hydrologic models have enhanced their utility in scientific studies and practice alike. However, the increasing complexity of these tools leads to a number of challenges, including steep learning curves for new users and issues regarding the reproducibility of modelling studies. Here, we present the RavenR package, an R package that leverages the power of scripting to both enhance the usability of the Raven hydrologic modelling framework and provide complementary analyses that are useful for modellers. The RavenR package contains functions that may be useful in each step of the model-building process, particularly for preparing input files and analyzing model outputs. The utility of the RavenR package is demonstrated with the presentation of six use cases for a model of the Liard River basin in Canada. These use cases provide examples of visually reviewing the model configuration, preparing input files for observation and forcing data, simplifying the model discretization, performing realism checks on the model output, and evaluating the performance of the model. All of the use cases are fully reproducible, with additional reproducible examples of RavenR functions included with the package distribution itself. It is anticipated that the RavenR package will continue to evolve with the Raven project and will provide a useful tool to new and experienced users of Raven alike.

Apure-the latter of which is re garded by some authorities as the true upper course of the Orinoco-all exceed the far-famed Rhine both in length and in volume, and in the rainy season roll down a vast flood such as few rivers of their size have ever been known to dis charge. The Orinoco itself averages more than twice the volume of the Danube, and could gain or lose a dozen Hudsons without appreciably affecting its regular rise and fall. On the other hand, it must be remembered that two rivers on the same continent greatly surpass it both in length and volume-the La Plata and the Amazon, the volume of the latter being estimated at six times that of the Orinoco. Apart from its size, the Orinoco is remarkable for several peculiarities, notably for its communication with the Amazon system through the Cassiquiare, which, it may be noted here, is not the sluggish canal at one time described, but a swiftly flowing river which di vides its waters in the ratio of two to one, the Orinoco receiving the lesser current. The famous delta with its thirty-six channels is also an interesting feature, though less unique than the in land delta formed by the Arauca and the Apure where they join the main stream. This has been caused by the enormous force of the "winter" floods, which break through the soft mud banks, forming a confused network of "canos," or channels, which relieve first one and then the other of the streams they so intimately connect.