Just lay the tarp out on an elevated area and run a drainpipe from the lowest corner to a collection tank.
Rain collection without gutters.
How to collect rainwater without gutters roof.
Caution rainwater collection system.
Walk around your house during the next rain and observe the water.
Additionally the water will not flow to your rain collection system if there is a clog.
It is easiest with gutters around your roof but there are methods of rainwater collection even without gutters.
Most homes direct water into the barrel with gutters and downspouts but even homes without gutters can use a rain barrel.
I have a big garden set back from the house that is hard to get a hose to.
Today houses are built with roof gardens that naturally absorb the rain and grow an insulating layer of grass.
20 rainwater catchment system no gutters required.
This is the most common type for homes built within the past 50 years though many owners of older homes still.
Have gutter guards installed.
Not only do you not want your harvested water to be full of debris dirt and pests but without filtering the water before it enters the harvesting system your barrel can become clogged.
To collect rainwater you can attach a rain barrel to your home s downspout so when it rains the water flows directly into the barrel.
Because it is mulched with woodchips it retains moisture after rains pretty well but i can still use some supplemental water during the dry periods of summer.
But if you do not have a roof garden you can still collect and use rainwater.
If you want to collect rainwater without a roof or downspout you can use a tarp instead.