As a bracket-mounted gutter, this form of guttering is by far the most popular design, as it offers the most favourable prerequisites for water drainage. The rounded guttering always guides the water towards the center, ensuring lower soiling (e.g. leaves) even in the case of minimal flow speeds.
In terms of material efficiency, the semi-round version is also the most favorable form, and this also applies to the resistance against mechanical loads and impacts, such as ice and freezing. The standard lengths are 10 and 18 feet.