about the first point

You may not want to skip catch basin around gutter down spout. I did this way and noticed from last week's heavy rain that the spot under down spout is already low and tends to accumulate water from surrounding area.

所有跟帖： 

• 很對，按書上的建議，gutter down spout最好在catch basin上麵。 -melody2010- ♀ (111 bytes) () 07/18/2012 postreply 11:07:19

• 那是地勢的問題，因該把靠近房屋的地勢墊高，讓房屋周圍的水自動流走 -萬楓- ♂ (0 bytes) () 07/18/2012 postreply 11:20:29