The annual town election season kicked off Tuesday when nomination papers became available in the office of town clerk Amy Warfield. This year’s election will be held April 14. Voters will be filling 14 townwide positions, including two seats on the Board of Selectmen and a seat on the School Committee. The other available seats are town moderator; two seats each on the Library Trustees, the Planning Board, and the Board of Health; a seat apiece on the Board of Assessors, the Housing Authority, and the Recreation Commission; and a Burlington seat on the Shawsheen Valley Regional Vocational Technical School Committee. Also on tap will be the election of 70 town meeting members, including 18 who will represent Precinct 7, which is being created as a result of an increase in the town’s population. Prospective candidates for townwide office and nonincumbents for town meeting seats have until Feb. 23 to take out nomination papers and Feb. 27 to return them. Incumbent town meeting members running again must notify the clerk’s office by Feb. 21.