What is the meaning of Swale?

A low tract of moist or marshy land.

A long narrow and shallow trough between ridges on a beach, running parallel to the coastline.

A shallow troughlike depression created to carry water during rainstorms or snow melts; a drainage ditch.

Bioswale, a shallow trough dug into the land on contour (horizontally with no slope), whose purpose is to allow water time to percolate into the soil.

A shallow, usually grassy depression sloping downward from a plains upland meadow or level vegetated ridgetop.

A gutter in a candle.

Alternative form of sweal (melt and waste away, or singe)

Alternative form of whale

Source: wiktionary.org