Children's Pool Depth and Safe Dimensions: A Guide

In small children, drowning is silent. The child does not thrash about or shout; because the head is heavy, it tips forward and the child loses control within a few seconds. Even a bucket, a paddling pool or a pool cover with 5 cm of water collected on it is a risk for a child of this age. Keeping the depth low reduces the risk but does not solve it on its own; it is equally necessary for both the child and the supervising adult to notice where the depth changes.

The mistake we see most often on site is treating the shallow end of a family pool as the 'children's area'. A shallow end of 100-110 cm is comfortable for an adult, but for a five-year-old it is water in which they cannot stand without knowing how to swim. A children's area is either a separate pool or a clearly defined section within the pool, separated by a step, a ledge and colour.

When the floor gradient exceeds this ratio, a child slides into deeper water without realising it. The profile we apply is as follows: a wide step or beach entry of 30-60 cm at the entrance, then a gentle slope down to 1.2 metres, and a change of colour on the floor at the transition to the deep section. This arrangement is drawn at the very start, when the position and dimensions of a garden pool are decided; if the pool is short, there is no room for a gradual transition and the deep section becomes smaller.

A gradual profile also offers an economic advantage. As the deep section becomes smaller, the water volume falls and the filtration and heating load is reduced. We have calculated the relationship between dimensions and volume separately in our article on pool dimensions and depths.

Slipping on a wet floor is a cause of accidents independent of depth. Glossy glazed ceramics and polished stone lose their grip when wet. For areas walked on barefoot, surfaces are assessed in three slip classes; steps inside the pool and floors shallower than 80 cm should be in the highest class. Non-slip 2.5 x 2.5 cm glass mosaic is produced in this class with a matt surface, and thanks to the small tile size, the density of the joints gives the foot additional grip.

Around the pool, the floor gradient is kept between 1 and 2 per cent. With a lower gradient, water pools and algae takes hold; with a higher gradient, a running child loses their balance. We have compared ceramic, mosaic and liner among pool finish options in a separate article; in the children's area, the decision begins with the slip resistance class and ends with colour.

On a light blue floor, a navy or dark grey band 15-20 cm wide is sufficient. The depth figures on the coping stone are placed on a non-slip surface, at least 10 cm high, and repeated along both long sides of the pool. These markings do not spoil the pool's design; a band chosen in the right shade becomes part of the mosaic palette.

The gap between the barrier's uprights should not exceed 10 cm, and its lower edge should not be more than 10 cm above the ground, so that a child cannot pass underneath or use it as a foothold. The gate opens outwards, away from the pool, and its latch is at a height the child cannot reach. No chair, plant pot or other object a child could climb on is placed next to the barrier. In our article on pool safety measures, we compared barrier, safety cover and alarm types one by one.

A water surface alarm detects the wave created by an object falling into the water and gives an audible warning. In a windy garden, basic models can produce false alarms; a model with adjustable sensitivity is chosen. An alarm is not a safeguard on its own; it speeds up the detection of a child who has got past the barrier. Shared safety works differently in a residential complex pool: there, the barrier, lifeguard and operating rules are planned together.

At this depth, fixed features and small sets with slides define the area in which the child plays standing up. Larger sets with slides need a depth of at least 110 cm; these sets are not placed in the shallow end of the family pool but in a separately planned section. The anchor sockets and supply pipes for the features are set into the concrete before the finish is applied; adding them to a finished pool later means removing the finish. We explained the pump and pipe requirements for children's water play and showers in our article on choosing pool showers and waterfalls.

The shower at the poolside lets the child rinse off sand and sun cream before entering the water, which in turn reduces the load on the filter. The floor in front of the shower is finished with non-slip ceramic, and the water runs directly into the drain, not back into the pool.

The right depth, a non-slip floor, a barrier and an alarm reduce the risk, but they do not replace an undistracted adult at the poolside.

The routine we recommend to families is simple: if there is a child in the water, one adult is 'on watch' at the poolside, without a phone in hand, and if the duty is to be handed over, it is handed over out loud. For a small child, the supervision distance is arm's length. Positioning the pool where it can be seen from the windows of the house and the seating area makes supervision easier; shrubs, a pergola or a plant room shed should not block the view.

When planning pool construction with a family with children, we discuss these decisions before the building permit. Because the depth profile is cast together with the concrete, changing it later requires breaking out and refinishing; the barrier, alarm and markings, on the other hand, can be added at any stage.