Preheat your oven to 350 and using pam baking spray, spray 3 9inch round cake pans
Using a medium whisk together the flour, cocoa powder, baking powder, baking soda, and salt
Using a medium saucepan over medium to high heat, combine the water and sugar.
Bring to a boil and stir until the sugar is dissolved. About 1 minute
Remove from heat and whisk in the chocolate and butter until melted
Whisk in the canola oil and vanilla extract
Quicky whisk in the eggs to avoid them cooking into the chocolate mixture.
Gradually whisk in the dry ingredients until combined
Fold in the chopped walnuts
Divide the batter between the three round cake pans
Bake cakes for 30-35 minutes or until a toothpick comes out clean