Ключевые слова: barrage, blue, bridge, canal, concrete, control, countryside, depth, drop, dynamic, flow, foamy, foreground, gauge, high, indicator, irrigation, level, low, marker, measure, measurement, meter, moss, nap, nature, netherlands, new amsterdam level, old, outdoors, overflow, polder, railing, reflection, river, ruler, scale, smooth, speed, stream, surface, vertical, water, water level, water management, waterfall, weir,