Why is the size of the catch basin so important?
The catch basin must be large enough to hold the water required for your stream. If your stream is long with a small catch basin, the pump, which is located in the catch basin, will run dry before the water can be pumped up to the top. Also, when the stream is turned off, all the water from the stream will drain into the catch basin. If the catch basin is too small, it will overflow every time you turn off the waterfall, requiring you to refill it when you turn it back on.
