Over Flow pools
It is the system that allows for the best water circulation. The infinity of the pool offers a clean line from the water to the edge of the pool and is free of impurities on the water surface or stains at the pool edge.
The overflow system consists of
- Swimming pool
- Surge Tank – a private pool should have the surge capacity of 5-10% of the amount of water in the pool, service or commercial pool should have surge capacity 10-15% of the amount of water in the pool. This depends largely on the number of people to use the pool and the depth of the Surge Tank. (See also – Surge tank volume calculation)
- Machine Room
The water falls through overflow channels to a surge tank by gravitation, then pumped to filtration and disinfection through the floor inlets, providing treated water back into the pool. Leaves and dust will be pushed out of the pool and filtered through gutters while the water travels back to the surge tank to be treated. The surge tank consists of a float valve to refill the displaced water caused by evaporation or filter cleansing. It also contains overflow pipes to convey excess water to waste to maintain the water level in the proper operating range.
This type of water circulation is a typical system for an overflow pool system. Should the surge tanks require maintenance, the water can be pumped through the main drain instead of the surge tank although the efficiency of the circulation will be reduced.
The Over Flow system is suitable for a spacious area as it requires more room to support various pool elements.
Surge tank calculation for overflow system
Overflow pipes
Overflow pipes should be least 0.20 in depth
Part 3 – 4 inch- overflow pipes
The area of the Over Flow Surge Tank is approximately 0.10 meters from under the gutter.
Part 2 – Volume of water
Volume of water for spare in case where many people are in the swimming pool
- For service/commercial pool – 1 person per 1 sqm. / 1 person per approximately 75 liters of water [75 x maximum number of people to be in the pool = amount of water that needs to be spared]
- For private pool – 1 person per 2 sqm. / 1 person per approximately 75 liters of water [75 x maximum number of people who fill up the pool (pool size (sqm. ÷ 2)) = Water that needs to be spared]
Part 1 – Water reserve amount for the system at water depth
In the Surge Tank, there must be a backup water filter system. At the height of 0.60 – 1 meter and enough to fill the pool when the water in the pool is reduced by approximately 0.05 meters [pool area (sqm.) X 0.05 = the amount of water needed at the depth of 0.60 – 1 meter]
Skimmer system
Skimmer pools are built and installed without a surge tank, therefore, it is less costly than the overflow system. The skimmer draws the surface water into it, along with any dirt and debris. And then passes this water through the filtration system, before it is pumped back into the swimming pool. However, without the surge tank, the water level of the skimmer pool needs to be 15-20 cm. lower than the edge of the pool to pump displaced water when people are in the pool. The standard recirculation system must be balanced with water inlets and outlets installed exactly opposite each other for more efficient water circulation. After some time, water stains and suspended solids may occur along the corner of the pool. Skimmer system consists of:
- Swimming Pool
- Machine Room
Skimmer pool is suitable for a limited space to maximize the pool size.
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