The first thing to consider is the site of your waterfall. The space does not need to be large, but take into account how large you want the waterfall to be and if you want it to have a steep drop-off or if you prefer a meandering waterfall that resembles more of a babbling brook. According to The Family Handyman, a waterfall needs to be at least 10-inches high to block the sound of street noise and it needs to have a minimum slope of 2-inches so take that into consideration when choosing the location, size, and look of the waterfall. Also, be careful to choose a spot where the waterfall can be scaled to fit so that it will look natural. The pump for the waterfall will also require electricity so be certain that it is located in a place where power is available.