DES MOINES — Des Moines plans to increase the number of hours it charges for downtown street parking. The city council voted Monday for new parking meter hours: 9 a.m. to 9 p.m. Monday through Saturday. Current meter hours are 8 a.m. to 6 p.m. Monday through Friday. In exchange, parking will be cheaper in the city’s seven garages. The city also will work with private lot owners for additional parking.