AUGUSTA — Multiple residents of a street in the Mayfair neighborhood say they’ve had ongoing problems with water on their properties, including one who said her basement was flooded by a foot-and-a-half of water, ever since the city installed a new taller sidewalk on their street in 2015. Windsor Avenue residents said they’re worried that their property values are lowered by standing water creating what some of them call swamplike conditions attractive to ducks in some yards in the neighborhood.