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Bamboo rain gutters are a green alternative to metal and plastic gutters and are often used in areas where bamboo is abundantly available. Bamboo gutters are cheaper and provide a beautiful rustic appeal, but are less durable than conventional gutters.
However, they are perfectly suited to harvest rainwater from a roof and irrigate a small vegetable garden for example. Rainwater can be easily harvested when it flows through an outlet drain that is connected by a pipe to a rainwater tank or container.
The usual form of a bamboo gutter for conveying water from a roof consists of a large diameter bamboo split lengthwise, with all the nodes removed. This is held to eaves by iron hooks, or by long pieces of wood or tree wigs nailed to the rafters, and notched in the upper edges to rest the split bamboo.
The size of the rainwater gutter is determined by the roof area and slope, while the diameter of the outlet drain is proportional to the roof area and the width of the gutter. In the table below you are able to calculate the appropriate gutter width and outlet drain diameter corresponding to a roof area:
|Roof Area (m²)||Gutter Width (cm)||Diameter Outlet Drain (cm)|
The depth of the bamboo gutter is approximately one-half of the gutter width. For example, if the gutter is 13 centimeters wide, then the depth should be 6.5 cm.
The diameter of the outlet drain is proportional to the volume of rainwater collected in the gutter. Otherwise, rainwater could overflow if the outlet drain were too small.
Bamboo Rain Gutter - Courtesy: Paul Sypkes
There are different ways of fixing bamboo rain gutters to a roof structure, the following illustrations show the most common examples:
1. Fix the bamboo gutter to a bamboo roof structure using cross-fixed wooden gutter holders.
2. Fix the bamboo gutter to a wooden roof structure using cross-fixed wooden gutter holders.
3. Fix the bamboo gutter to a wooden roof structure using wooden eaves.
4. Fix the bamboo gutter with iron gutter holders to a wooden roof structure using wooden eaves.
5a. Using tree twigs as gutter holders.
5b. Fix the tree twig gutter holders to the roof structure with rope, iron wire or nails.
Bamboo rain gutter grow system with 14 pots of vegetables.