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coupla thoughts on waterfalls
most folks use the dirt from digging the hole and don't let it settle before they construct their waterfall. end results are cracks... safer bet is to wait a year.
the more and different the components used to make the waterfall that have different heat and cold responses the easier it is to have troubles of separation.
waterfalls need to be designed so that in cold countries they can be turned on or off and redirected back to the pond to avoid a chilling effect.
a final drop of two feet before entering the pond is helpful minimally to add some oxygenation for the effort to construct one....
by forming a chamber with bigger flat edged rocks at the base where the water cascades over the last lip into the pool, the waterfall splash sound is megaphoned across the surface a great distance. If done in a japanese gardening manner ofter you can hear it before you finally see it....
and finally please don't fill a cemented channel with gravel or peagravel as all it does is collect dirt and go anaroebic....
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