Apple and Oatmeal Crisp

1 1/2 cups water
1 1/2 cups (packed) light brown sugar
1/2 stick butter, melted
2/ Tbsp. + 1 1/2 cups flour
1/2 tsp. salt
1 1/4 tsp. cinnamon
3/4 tsp. nutmeg
2 1/2 pounds cooking apples; peeled, cored and cut into wedges
1 stick butter, cut into small pieces and at room temperature
1 1/2 cups oatmeal

Preheat oven to 350 degrees. In a mixing bowl combine the water, 3/4 cup brown sugar, melted butter, 2 Tbsp flour, 1 tsp. cinnamon and 1/2 tsp nutmeg, whisk until smooth. Place apples in 9x12 glass baking pan and pour mixture over the apples. Mix well. In a mixing bowl, combine the remaining 3/4 cup brown sugar, 1/4 tsp. nutmeg, 1/4 tsp. cinnamon, 1 1/2 cups flour, oatmeal and butter. Work the mixture together using your fingers until it resembles a crumb topping. Pour topping over apples. Bake for one hour.