Quick Answer
To build a DIY rainwater collection system, you'll need a downspout diverter, a collection tank, a roof catchment area, and a system for filtering and storing the water. First, identify the best location for the collection tank, considering factors like sunlight and accessibility. Next, determine the size and material of the tank based on the roof catchment area.
Designing the Collection System
When designing the collection system for a frame cabin, consider the total roof area of the cabin, the rainfall rate in your area, and the desired storage capacity. A general rule of thumb is to use 1,000 gallons of storage capacity per 1,500 square feet of roof area. For a typical cabin with a 1,000 square foot roof, use a 1,000-1,500 gallon tank. Use a 1:12 slope for the roof catchment area to ensure water flows freely.
Installing the Downspout Diverter
To install the downspout diverter, attach a Y-junction to the downspout, about 3-4 feet off the ground. The Y-junction should be pointed towards the collection tank, with a hose or pipe connecting the two. The downspout diverter should be able to handle the rainfall rate in your area, so consider using a diverter with a 1/4 inch per minute flow rate. Use a hose clamp to secure the hose to the Y-junction and the collection tank.
Filtering and Storing the Water
To filter and store the collected rainwater, use a 100 micron filter to remove debris and contaminants. Install the filter at the tank outlet, and consider using a first flush device to remove the first flow of water from the roof, which may contain contaminants. Store the filtered water in a covered tank to prevent mosquito breeding and contamination.
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