In the mean, these two methodological effects do indeed cause severe negative biases in DDF values, when averaging over 52 Swiss stations. For individual stations though, the underestimation can be up to 5.1 times as high as the average, depending on rainfall duration, for T=5 yr. It must also be remembered that the original data used in these analyses are not continuous but were already aggregated over 10-min periods, so that the actual biases should be even higher than what we report here. We conclude that: (i) none of these two methodological shortcuts should ever be used when obtaining DDF values; (ii) they may very well explain the underestimation we observed in Concepcion where, e.g., the official 1-h, 10-yr design rainfall actually recurs every 10 months, not every 10 years, according to our analyses.