In summer times there are often a cut in water supply.What are actually the reasons for this?

Be it summer or winter the water problem is the same. we don't have a proper water management system in mauritius. Our annual rainfall is much higher than places like Tunisea and Dubai , but rarely you will find water shortage overthere.
Here you have to pay extra electricity to have water.
let me explain firstly you got to buy a water tank, then instal a water pump and then then wait for the tank to be full and use waterpump to have proper pressure.
Just for a simple water problem you have to invest roughly a minimum of Rs 15,000 to 20,000 to have the above done.
what more important is how we make full use of our water, even if there is plenty of rainfall, we do manage to capture only 10-15 % of it , the rest is donated to sea.
In the last 40 years how many reservoir or dam have we built ?
what was our population then and now ?
what do we think that rainfall is only meant for our central plateau ?

Like others have said its supposed to be because of the lack of water in the reservoirs but where I live water is reduced all throughout the year! Sometimes its only trickling so you cant even wash dishes. The other night it was 7pm and there wasn't enough water to have a proper shower! Its really annoying so I think its a must that everyone has storage water tanks for when supply is low.

We get our water from the reservoirs around the island. Think there are 5 main ones. In summer, the reservoirs tend to dry up quickly because it doesn't rain as much as in winter and sometimes it doesn't rain at all. Therefore the CWA has to limit the water supply to ensure the water that's left in our reservoirs is used efficiently. People have a tendency to waste water probably because they don't care or just don't realise how wasting water depletes our reservoirs and therefore affect the supply for the rest of us. The fact that water is cheap as well makes people more prone to waste it. If it was as expensive as electricity, then people would think twice before letting their taps run unnecessarily but then low earners would be affected.

The only reason is because of lack of rainfall. there has been rain after a week in my region. some months ago it was raining almost everday.