If you have a long roof, then the drain pipe of the drain should be placed exactly in the middle. This is allowed to evenly distribute the load.
The most common problem in the operation of the drain is its pollution. The cause of blockage may be fallen leaves. If they are distributed throughout the gutter, then the garden scoop will not be the most convenient device for cleaning. You can make a scoop with a canister from under machine oil. To do this, cut off the upper part. Thus, you can not only collect garbage, but also scoop up stagnant water. So that the problem with the leaves does not bother you anymore, you can close the groove using a plastic grid.