Turkey: Twice a day during the rainy season, Raquel Izarra climbs to the roof of her home in the eastern Lima suburb of Santa Ines Bajo and measures how much rain has fallen using a homemade gauge, before sending the data to the authorities using WhatsApp.
Together with more than 60 other volunteers, she is trying to ensure her community will have time to prepare should heavy rains trigger flooding and mudslides in the low-income area, as they did in 2017.