Adding a waterfall is simply a matter of taking advantage of the slope you have or create with the soil you excavate when digging out the pond. Dig out for the waterfall steps allowing for the depth of the rocks the water has to move over. Additionally you have to keep in mind that the rocks lining the sting have to go on prime and inside the liner. Many times the main source of a pond leak is at the waterfall because of poor planning and construction. As long as you keep the edges of the liner well above the water line and allow for the splash to be contained inside the liner, there should be no leaks. A few of the rocks will have to be mortared in to maintain the water flowing over the rocks instead of under and round them. Use concrete combined with sand for the mortar. Regular mortar will disintegrate over time. The mortar can later be hidden with gravel. Adding marginal plants will soften the rock work alongside the edge and add to the natural look. If the waterfall was created as a berm with the soil from the excavation of the pond, timber and huge bushes may be planted on the again side to make it look more natural.
Adding a stream is far simpler than a waterfall feature. It can be stepped or have a delicate slope main into the principle koi pond. It may be straight, curved, or winding. It's a must to be inventive concerning the beginning of the stream to make it look natural. Does it appear like it's coming by a privateness fence or bubble up from the ground. Strategic placement of a large rock or plantings can disguise the start of a stream.
The main part of the stream needs to be lined with gravel. River gravel tends to look extra natural than pea gravel or pebble stone. Selective use of larger rocks contained in the stream and along the edges, breaks up the look and the water flow. Enable 1 - 2 toes on each side for gravel. This helps hold the liner in place and the grass clippings out of the water.
