THESAURUS
gulch
abysm, abyss, aqueduct, arroyo, bed, box canyon, breach, break, canal, canyon, cavity, chap, chasm, check, chimney, chink, cleft, cleuch, clough, clove, col, coulee, couloir, crack, cranny, creek bed, crevasse, crevice, culvert, cut, cwm, defile, dell, dike, ditch, donga, draw, dry bed, excavation, fault, fissure, flaw, flume, fracture, furrow, gap, gape, gash, gorge, groove, gulf, gully, gullyhole, headrace, hole, incision, irrigation ditch, joint, kloof, leak, moat, notch, nullah, opening, pass, passage, race, ravine, rent, rift, rime, river bed, riverway, runnel, rupture, scissure, seam, slit, slot, sluice, spillbox, spillway, split, stream bed, streamway, swash, swash channel, tailrace, trench, valley, void, wadi, water carrier, water channel, water furrow, water gap, water gate, watercourse, waterway, waterworks
ROGET THESAURUS
gulch
Interval
N
interval, interspace, separation, break, gap, opening, hole, chasm, hiatus, caesura, interruption, interregnum, interstice, lacuna, cleft, mesh, crevice, chink, rime, creek, cranny, crack, chap, slit, fissure, scissure, rift, flaw, breach, rent, gash, cut, leak, dike, ha-ha, gorge, defile, ravine, canon, crevasse, abyss, abysm, gulf, inlet, frith, strait, gully, pass, furrow, abra, barranca, barranco, clove,
gulch, notch, yawning gulf, hiatus maxime, hiatus valde deflendus, parenthesis, void, incompleteness, period, interim (time), with an interval, far between, breachy, rimose, rimulose, at intervals, longo intervallo.