Preheat oven to 350°F (180°C). Grease and flour 9х13 oblong pan. In a large, bowl combine the flour, salt, sugar, and baking powder. In a separate bowl, mix together pumpkin puree, eggs, oil, water and sugar until well blended.  Then combine with the dry ingredients and cranberries, do not mix too thoroughly. Pour in the prepared pan. Bake for about 50 minutes in the preheated oven. Cake are done when toothpick inserted in center comes out clean. Turn out of the pan and let your cake cool on a rack. Meanwhile, in a small sauce pan combine water, maple syrup and orange zest, bring to a boil. Cook for a 3-5 min and let to cool. Then pour the syrup on your cake, leave for a 2-3 hours