If there are orographic rainfall effects, greater erosivity at the higher elevations might be expected, as observed in southwest USA.Article Temporal and elevation trends in rainfall erosivity on a 149...
Yes, there is relationship between in rainfall erosivity and elevation. But rock types and magnitude of rainfall, duration of rainfall also important. In case of orographic rainfall windward and leeward slopes might be different situations.
According our results for the Czech Republic conditions the relationship is not statistically significant. This should be always verified for local conditions. Strong statistical significance exhibits for example longitude for the Czech Republic conditions.