Save money on pond pumps, pond filters, backyard waterfalls, fountains, ponds, water gardening, koi food and how to achieve crystal clear garden pond water too.
| This is a 250 word (approx) summary of a chapter from
my water gardens book pictured to the left. For a complete list of summaries see the right hand column Concepts: pump, pond, flow, water, waterfall, litres, cost, head, flow rate, pipe, metres, selection, power, electricity, consumption. Summary: - Without a pump it is almost impossible for a small garden pond to function as anything other than a breeding ground for mosquitoes. - A pump works in a very simple way: it is submersed in the pond and water is sucked through a strainer after which it enters the centre of an impeller. - As the water enters the impeller it is flung out from the edges of the impellor under pressure into the connecting pipe, which leads the water to the waterfall or the fountain. - The power of the pump cannot be increased so if more flow is wanted then less lift can be obtained and vice versa. - To what height do I want to pump that amount of water - I measure this height difference from the water surface in metres remember and NOT from the bottom of the pond? - The box will state the flow at 1 metre if it is a good pump. - For all these reasons the design and therefore cost of a true pond pump is very different from that of an indoor pump. - Now if you installed a 4000L and a 1800L in parallel you would be able to pump approximately 4,400 litres per hour up to 1.0 metres. - You can imagine in a thinner diameter pipe that the water would have to flow much faster for a constant water flow rate in terms of litres per hour. - The calculation of friction loss is very complex and is a function of flow rate, pipe diameter, density and other variables and empirically determined factors. ---------
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