Runnel

Spring, is ye comen in, / Dappled larke singe, / Snow melteth, / Runnel pelteth, / Smelleth wind of newe buddinge.

Source: wiktionary

Every little runnel in the bay was astir, and yet the land around him was as dry as flax, and no drop of rain had fallen.

Source: wiktionary

[…] great chambers in the rock where all sorts of plants were growing, under windows which had been cut to let in the sun, and glazed to adjust his warmth, and where runnels of water ran between fruit trees and seedlings, pumpkin plants and herbs.

Source: wiktionary

Still lower down the slope, on a staircase by the Eastern Bastion, there is an elaborate piece of hydraulic science for checking the flow of water. A stone runnel is made to descend the stairs in a series of parabolic curves which would subject the water to friction, and thus reduce its velocity and the consequent danger of a flood on the pavement below.

Source: wiktionary