Question

how malaria can be controlled by preventing stagnation of water

Answer 1

Mosquito bites are hard to avoid in infested areas, but not impossible if you follow these simple tips.
Prepare your environment
Malaria-carrying mosquitoes are extremely active during twilight periods. So, make sure that you use an effective insect repellent to keep them in check when dusk or dawn breaks
Dress to prevent
Sport loose, light-colored clothing that covers your entire arms and legs. Refrain from wearing perfumes or aftershaves that could gather unwanted attention. Shield any exposed skin with the help of body insect repellent.
Anti-malaria medication
No malaria vaccines are available that can prevent infection. However, ask your doctor to give anti-malarial medication a couple of months before you travel to malaria-infected areas. If prescribed, you must finish the whole course for the medication to be completely effective.