Surface flow is when water from the rain runs on the surface into the ocean.
They believe that it is from water flow.
When the ground water flow out of the earth surface as a form of spring.
A natural flow of water from underground is called a spring. Springs occur where an aquifer is filled to the point that the water overflows onto the land surface. This flow of water can create streams or rivers.
Runoff
Surface water will collect in hollows, ditches, reservoirs, add to the water table, etc.
Surface water flows downhill or seeps into the ground becoming groundwater. The natural flow of surface water is downhill or seaward. See the related link for more information.
water flow which occurs during or after rain, when soil is infiltrated to full capacity and excess water.
Sheet flow is the flow of water across a surface in a thin layer, like a sheet. It typically occurs in areas with low slope, such as flat ground or gently sloping terrain. Sheet flow is an important process in the movement of water over the land surface and can contribute to erosion and sediment transport.
When the ground is saturated, excess water will flow as surface runoff. This occurs when the soil can no longer absorb additional water, leading to the movement of water over the land surface towards lower elevations, such as streams, rivers, or lakes. Surface runoff can contribute to flooding and erosion, as well as transporting sediments and pollutants into water bodies.
The Coanda effect occurs due to the presence of a curved surface immersed in a flowing fluid when the surface curves away from the flow. The flow 1) causes a lowered pressure at the surface and 2) entrains fluid to flow towards the surface. The effect can be seen as smoke streams in a wind tunnel follow the shape of, e.g. a streamlined automobile. Another example is a water flow adhering to the back of a spoon. This is caused primarily by the Van der Waals (surface tension) forces between the water and the surface of the spoon.
A waterfall is a steep fall or flow of water.