If it is a rather large waterfall, the water is filling up the bowls in the waterfall till it spills over back into the pool. If you have to keep adding water after using the waterfall it could be a leak in the waterfall itself. If you don't have to add water when the waterfall is not in use and you do when you use it, well, guess what? Probably a leak in the waterfall. If it is a natural rock waterfall look for cracks in the grout between rocks. If artificial rock, look for cracks everywhere.
they are loud, and can cause mudslides.
gravity
I don't think a waterfall can cause electricity, but water is used to produce electricity.Check this out to learn more: http://www.ehow.com/how-does_4683787_waterfall-generate-power.html
Erosion can cause a waterfall to retreat upstream over time by wearing away the rock and sediment at the base, creating a plunge pool. The force of the waterfall can also erode the sides of the waterfall, creating a deeper channel and possibly changing the shape of the waterfall itself.
A salmon jumping up a waterfall
Edema
blown head gasket
Waterfalls do cause erosion, but generally at a slower rate compared to other factors like heavy rainfall or human activities. The force of the water falling can erode the rock and soil at the base of the waterfall, leading to the formation of a plunge pool. Over time, this erosion can contribute to the retreat of the waterfall upstream.
They are, all the time. Every waterfall moves upstream constantly (but slowly).
You may have a short circuit somewhere that is leaking current to ground. Or you could have a bulb or accessory that is using current even when the vehicle is turned off. Improperly installed aftermarket stereos & amps are a notorious cause of this.
Tides affect the level of water in a coastal area, which can impact the flow of a waterfall. When the tide is high, more water may be flowing over the waterfall, creating a more dramatic effect. Conversely, during low tide, less water flow may result in a less impressive waterfall.
With a scan tool after repairing the cause of the code that turned it on.With a scan tool after repairing the cause of the code that turned it on.