Fall. Depth Feet and from Decimals. Datum Line. No. of Distance Per 100 Between To To Depth of Remarks. Stake. Between Feet. Stakes. Drain. Surface. Drain. Stakes. Silt 20.70 18.20 2.50 ft Basin. ft. ft. C. 1. 82 ft. 2 ft. 1.64 ft. 19.06 " 15.44 " 3.48 ft C. 2. 39 ft. do. .78 ft. 18.28 " 14.36 " 3.83 ft C. 3. 65 ft. do. 1.30 16.98 " 12.85 " 4.13 ft ft. C. 4. 51 ft. .56 .28 ft. 16.70 " 12.18 " 4.52 ft C. 5. 43 ft. do. .24 ft. 16.46 " 11.79 " 4.67 ft C. 6. 47 ft. do. .26 ft. 16.20 " 11.69 " 4.51 ft C. 7. 32 ft. do. .18 ft. 16.02 " 11.55 " 4.47 ft Silt-Basin here. Made deep at Nos. 7 and 10 to pass a depression of the surface at No. 9. C. 8. 41 ft. 2.83 1.16 14.86 " 11.37 " 3.49 ft ft. C. 9. 12 ft. do. .34 ft. 14.52 " 11.06 " 3.46 ft C.10. 38 ft. do. .99 ft. 13.53 " 8.94 " 4.59 ft C.11. 41 ft. 2.00 .82 ft. 12.61 " 8.52 " 4.19 ft C.12. 41 ft. 1.09 .44 ft. 12.27 " 7.86 " 4.41 ft C.13. 41 ft. do. .44 ft. 11.83 " 7.70 " 4.13 ft C.14. 41 ft. do. .44 ft. 11.39 " 7.39 " 4.00 ft C.15. 41 ft. do. .44 ft. 10.95 " 7.06 " 3.89 ft C.16. 41 ft. do. .44 ft. 10.51 " 6.73 " 3.88 ft C.17. 41 ft. do. .44 ft. 10.07 " 5.90 " 4.17 ft NOTE.—The method of making the foregoing computation is this: 1st. Enter the lettering of the stakes in the first column, commencing at the lower end of the drain.