Whenever you look at a landscape it's important to consider where it is in the greater landscape, like overhead areal scale. Google earth and Sketchup are both tremendous resources for gaining this kind of understanding of a landscape. Without knowing where it is in the greater landscape there is no way to make an educated guess as to if a spring like
Sepp's is possible.
This type of spring technique is going to for most intents and purposes not be practical to do by hand. One big thing at play is that the water needs to have gone through
enough of the earth body to be properly mineralized and energized. This also filters out potential surface toxins. In most cases I wouldn't want surface runoff collected in swales to be my primary drinking water. Casing a surface spring is certainly doable by hand, but this terrace spring is too deep to dig by hand. The trench ranged from 10' - 20' deep, and 200' or so long. Then there is the pipe leading to the cistern, and the 10' deep hole for the cistern. I suppose it's doable by hand, but your looking at years for the
project as opposed to days. I think if you ever looked back on it you would conclude that $2,000 for an excavator to do all of the work is money well spent.
I'm a big fan of rain gardens, I think every house
should have it's gutters feeding into a rain garden. What I would really love to start seeing is rain gutter hugelkulturs, basically a water retention space surrounded by
hugelkultur so that the water wicks into the beds. This would produce a garden that would require no watering in most climates around the world. I hope to put in a ton of these this year. Granted this is a VERY quick and dirty illustration, but bear with me:
The water retention would be sized for the climate, to store enough rainfall for the dry season. In the spring the surplus water would saturate the
wood in the hugelkultur, providing moisture reserves for the dry season.