sitch
A brook; an occasional small waterway: a ditch, a gutter or drain; a ravine.
This is the boundary at Earnleie: First from Earesbrook and [qu. to] the short thorns, […] from the pit to Heortseges brook, along the brook to the mouth, and from the mouth to Byinnig-brook, and thence up along the brook to the sitch (i.e. runnel), and from the sitch to Sciteresford, and from the ford to Bromes Combe, […]
Where it comes from
From Middle English sich, siche, from Old English sīċ (“a watercourse; sike”), from Proto-West Germanic *sīk, from Proto-Germanic *sīką (“slow flowing water; a trickle”).
Adapted from the Wiktionary entry sitch (CC BY-SA 4.0).