The detail above illustrates the drainage syste used on the building. It demontstrates the wayt the box gutter is attached to the building with timber battons and spandek. Also not the down pipe from the upper roof to the lower roof and the size of the gutter on the lower roof. Note the hole on the box gutter in case of over flow and flooding. 
The image above illustrates a section with a half round gutter and downpipe system. I think it is important to note the positioning of the flashings and the way they are designed to avoid any water from causing any potential damage to the building due to the moisture
The image above isillustrates a pre-cast/tilt up wall slab section. It is important to understand the way the flashings are designed to protect moisture from enetering the building. Also important to note is the sealant and backing rod. 
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