waterways, rivers, embankments, wetland, ponds, lakes, canals, riverbanks, riversides, creeks, watersheds, reservior, footpaths, tributaries, weirs, catchment, riverbeds, floodplain, estuary, river basin, dams, reservoirs, gullies, silt, lochs, nullah, nala, anicut, quarries, sedimentation, habitats, diking, uplands, flowage, drains, drainage, distributary, shorelines, groundwater, sewerage, polders, zambezi river, tarn, flood plain, salination, effluent, marshland, wadis, soakaway, sluiceway, fenland, murrumbidgee river, forebay, rills, hedgerows, lagoons, namoi river, revetments, gravels, roadbeds, heaths, towpath, millrace, setts, streambed, ditches, riparian forest, indus river, brickfields, spillway, fords, brook, vlei, canalization, embayment, danube river, inlets, soils, streams, carriageway, roads, brahmaputra river, bracken, encroachments, basins, groyne, marshes, channelisation, billabongs, heathland, gabions, swales, headrace, marsh, outfall, tarmacadam, sluices, bailey bridge, berming, crossness, coulee, watercourse, drainages, estuaries, refuges, waterholes, passageways, wadi

drainage system