If the nozzle is wide but not smooth and concave and convex, the flow will flow at the lower recess of the nozzle. Because the change of concave convex is often irregular, or deep or shallow, or wide or narrow, resulting in the drop of water into a number of different thickness of the water column or width of different thickness of different water curtain. This form of waterfall changes very rich, even if the water curtain is continuous, there will be wrinkles appear. This waterfall is common in nature, often found in natural mountains.
If the water is wide and flat, the water will fall evenly along the nozzle, the formation of munltivariable curtain shaped water curtain. This waterfall is flat and tidy, with little change, but a strong sense of unity. The waterfall water level, water falling evenly, and there is no water, so the water curtain is smooth and transparent, suitable for water curtain cave or building outside the window into the landscape.
If the nozzle is narrow "V", the word "U" or "glyph", the current is concentrated into a water column. This type of waterfall flow speed, strong dynamic, generally in the drop when the larger the better.
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