Lama
Lama is a local toponym that denotes a wide furrow in the ground typical of the Murge landscape in Puglia, Italy. Lamas convey rainwater from the Murge plateau to the endpoint of the drainage basin they belong to.
Characteristics
Lamas are generally confused with rivers or streams. There is a big difference between lamas and streams, since lamas collect only rainwater of their drainage basin, while they are completely dry when there is no rain. Moreover, in lamas water mostly flows underground and just a small amount of the rainwater flows on its surface.
As for lamas, surface runoff is greatest in the extreme and uncommon situations of heavy rain. Lamas usually contain fertile soil, that deposited over the millennia due to the erosion and they are usually cultivated. Since they contain fertile soil, they are distinguishable from the nearby typical area of the Murge plateau, that is almost everywhere stony, arid and hard to grow.
How to map
Being substantially different from waterways, there is no unique way to map all lamas, some might resemble a simple natural=gully, some might look like a natural=valley, while near the cities the lamas might have been turned into canals (waterway=drain + intermittent=yes) to contain storm water. In many cases the land is cultivated and it might be hard to tell what defines the lama exactly. Given that none of these tags describes the lama specifically, but rather the secondary characteristics of the landscape, the whole area along the length of the lama might be mapped with place=locality along with name=* while mapping separately the characteristics of the land (farmland, scrub, drain, etc.).