If you need to perforate the basin yourself, the job isn't difficult. Basins need holes to allow the water to come in. Some sump basins will come already perforated, but many will not.Once the basin is set up, secure in place by adding layers of small - medium size stone (not gravel) around the basin. Insert the pump to the sump basin, connect the water line, and make sure the hose extends all the way up to the upper pool. (See below for more instructions.) Place your sump basin into the excavated hole at the bottom of the waterfall, above the underlayment and liner. Drill holes into your sump basin if it doesn't already come with them. 5 ton of small (.5 - 2 inches) gravel per 10 feet (3.0 m) of stream, plus 1 - 2 tons for the upper pool and lower basin each 75 ton of medium (6 - 24 inches) rocks per 10 feet (3.0 m) of stream 1.5 - 2 tons of large (12 - 24 inches) boulders for upper pool and lower basin, plus 2 - 6 tons extra for 10 feet (3.0 m) portions of stream that are above ground.Here's what you can expect to order when it comes time to buying stones for your waterfall:.This is a much more reliable way of getting exactly what you want, as opposed to merely ordering a kit and hoping that the stones are ones that will look good in your backyard. Visit a "rock," "quarry," or "gravel and stone" dealer in person to get a feel for what kinds of stones your waterfall might enjoy. Generally, waterfalls contain three different sizes of stone: boulders, or larger stones, which frame the waterfall(s) rocks, or medium-sized stone, which serve as the connecting stones and gravel, which fills in the bottom of the stream and in between cracks and crevasses. So if your stream capacity is 100 gallons (378.5 L), a 50 gallon (189.3 L) basin and a 200 gallon (757.1 L) pool will easily accommodate the stream. Now, simply make sure that either your upper pool or lower basin holds more than the total stream capacity. Measure out how many linear feet your entire stream takes up.
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