Irrigation for a tree

Hello,

we have a >15m tall, approximately 60-year-old copper beech tree in our small front garden. Unfortunately, our soil is very sandy and dry, and additionally, a lot of soil is sealed due to the adjacent street and the house. The beech received far too little water during last year's dry summer and shows some drought damage.

To prevent this in the future, I want to water it additionally with water from the roof. I do not want to build a complete infiltration system for the roof water but to tap some of it and supply it to the tree via drainage pipes and perhaps an infiltration tank with a few hundred liters.

I have already looked at calculations for complete infiltration systems. But I do not have to design for large peaks, as the sewer connection remains as overflow. I only want to be able to store enough water from a heavy thunderstorm for a few dry days so that the tree can receive more continuous water supply. The roof area is about 50 sqm. There is a 1-inch hose connection at the downpipe of the gutter. There is not much pressure there, so most of the water will probably continue into the sewer.

Has anyone done something like this before? Do landscapers have experience with such things?

All tips and ideas welcome
Regards and thanks
Michael

We had inexpensive lattice tanks until the renovation. I believe that is the cheapest option, but you still have to do the watering yourself. My predecessor had a "house waterworks" for that, meaning a pump.

With a sufficiently large container (rainwater barrel, IBC), you can make something. The container is filled from the downpipe. The container has an overflow DN 150 just below the lid, the overflow goes back to the downpipe. Furthermore, the container has a thin outlet DN 10 near the bottom, just above the ground (you may need to experiment a bit), with a hose to the tree.

Function: Rain fills the container up to the overflow, the tree is watered drop by drop as long as there is sufficient water level in the container. Everything is automatic so far (check for contamination).

I actually want to direct the water from the downpipe directly into an infiltration tank buried within the tree's catchment area, so I no longer have to water manually. Unfortunately, I can't link the parts due to forum rules. So far, I have seen modular tanks with a capacity of 140 liters each. I am wondering whether I should bury one or two, or even more.

What I don’t know yet is how much water really comes out of my hose during heavy rain. Does anyone have experience with how quickly a rain barrel fills up from a tap?
With heavy rain (>20mm), about 1000 liters of water accumulate from a 50m² roof area. I would like to store some of that for dry periods.

Regards and thanks
Michael