I defined a valley as a pond. The contours range from 1350 to 1315. The polyline contours are all closed. My goal is to create a stage storage curve for the valley. The output seems wrong for a couple of reasons:

1) The area output for the highest contour is an order of magnitude of 3 too low. Area = 178421.76, compared to 143262679.60 given by the "area" command.

2) The area output for 3 of the contours (1347,1339,1337) are zero.

Can anyone suggest a solution to this problem?