Is this a question that you have asked yourself after following a recipe, for instance, to make pizza? You have used the same ingredients and followed all the steps and still the result doesn’t look like the one in the picture… Don’t worry: you are not alone! This is a common issue, and not only in cooking, but also in hydrological sciences, and in particular in hydrological modelling. Most hydrological modelling studies are difficult to reproduce, even if one has access to the code and the data ( Hutton et al., 2016 ). But why is this? In this blog post, we will try to answer this question by using an analogy with pizza making. Let’s imagine that we have a recipe together with all the ingredients to make pizza. Our aim is to make a pizza that looks like the one in the picture of the recipe. This is a bit like someone wanting to reproduce the results reported in a scientific paper about a hydrological “rainfall-runoff” model. There, one would need to download the historical data (rainf
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