Nature was kind to Lake Hartwell in the first month of 2013. The sub-basin received above-average rainfall, a total of nearly eight and three-quarter inches.According to the Corps of Engineers, that’s the most rain for January in the sub-basin in 15 years. Lake Hartwell’s average January rainfall is 5.3o inches. Most of the recent rains produced run-off in the reservoir that equated to about 4.5 feet of lake level gain. This week Col. Jeff Hall, commander for the Savannah River Basin, is explaining why flow rates can’t remain the same through out the year.