It’s like a new city springing to life: 11,000 homes and apartments, seven public schools, a pair of fire stations, a police station, a slew of office and commercial buildings and 1,000 acres of parks, trails and other open space. Expected population: 25,000. But will it have enough water? As construction begins this month on the first model homes at Folsom Ranch, a 3,300-acre development in the city of Folsom south of Highway 50, state regulators continue to have questions about the project’s water supply.