it's actually DIY gutters made from cardboard and polyethylene and galvanized metal... i do not recommend the same exact gutters as it is unique to me since i work in various renovation and construction, and can apply what can seem to be complicated DIY to many, and i save a lot of money by using these methods. But it can be done in ready made gutters in the same system, under the gutters is a perpendicular longitudinal res that bottom feeds them by flooding from below, and then it shuts off and gravity drains it back. simple plain old ebb and flow, nothing more