Preheat oven to 350 degrees. Grease and flour an 11X15 baking pan, and set aside. In a mixing bowl, thoroughly combine flour, sugar, salt, baking soda, and cocoas. In a separate mixing bowl, combine zucchini, water, vanilla, oil, and eggs. Combine wet ingredients with dry, and stir until all contents are moist. Pour into baking pan, making sure the mixture is even and level through pan. Bake for 20-24 minutes, or until the center is firm and a toothpick inserted comes out clean. Cool and enjoy!