In many parts of the city (and the country), the buried "sewers" can not handle the volume of water during heavy rains, specially when they drain into a common klong that has many sewers emptying into it. And the sewers may not be buried that deeply so when they don't drain correctly (i.e., quickly) water backs up and comes out the gutter drains. Some or all of a housing development's sewers may drain into a klong right outside their property drain, and we have all seen klongs overgrown with whatever. And all the development over the years has severely restricted ground water run off.
Yes, ask the development's office for relief or go to the Tessaban and see what avenues are open there.