Drainage - By which method?

From conversations with landscape gardeners, construction supervisors, neighbors, friends, and acquaintances, I have now gained an overview of possible drainage methods. As expected, the people interviewed contradict each other, and everyone considers a different method to be the best. How does one find the right solution?

Possible methods:

1. Pebble surface to prevent erosion in the lawn caused by outflowing rainwater, possibly supplemented by a few square meters of a basin to catch/channel larger amounts
2. Diversion of rainwater into a plastic drainage pipe wrapped with or without coconut fibers, e.g., 5-10m, possibly extended by an overflow opening at turf level
3. Diversion into an underground gravel pit lined with fleece, e.g., 5-10m³
4. Diversion into a gravel pit lined with concrete rings, e.g., 3 rings
5. Diversion into a construction made of plastic cages wrapped with fleece, which are even supposed to be driveable over

I have about 250m² of roof surface on the house (4 downpipes) and 70m² on the garage (2 downpipes). The slope from the street (curve) to the wedge tip is about 1m and runs relatively evenly.

So far, we have had no problems (even during the century rain). The water stood in puddles for 1-2 days, which gradually became smaller, and then eventually the water was gone. According to the soil report, the water table is at a depth of 1.6m. During the excavation of the strip foundations (about 1m below ground), no water had formed.

Is there a cure-all or only well-intentioned advice, most of which works and some of which do not in extreme situations?

In this context, I would also be interested to know whether sealing the facing shell in the area below the terrain surface (gravel strip) is necessary.

What kind of soil do you have? Permeable, sandy? Clayey, rocky? Our garden landscaper installed a drainage under the gravel strip for clayey soil and connected it to the rainwater drain because infiltration works poorly here. That also keeps the wall nicely dry. Karsten

What kind of soil do you have? Permeable, sandy? Clayey, rocky? Our garden landscaper installed a drainage system under the gravel strip in clayey soil and connected it to the stormwater drain because infiltration doesn’t work well here. That also keeps the wall nicely dry. Karsten

Under the topsoil (30-40cm) it becomes very sandy (permeable).

How is the drainage under the gravel strip constructed? We don’t have a stormwater drain.

Then the gravel is enough for percolation. Drainage is pipe, orange plastic, you might know it, leg-thick, flexible. Around it is coconut. It holds back soil, water can diffuse into the pipe, off it goes. Karsten