Geodetic Deformation Survey of Upper and Lower Siah Bisheh Dams:

Siah Bished deformation monitoring survey covers two dams:

- Siah Bisheh Upper Dam which is a concrete-face rock-filled dam with 438m long crest and 85m height from foundation; and

- Siah Bisheh Lower Dam which is a concrete-face rock-filled dam with 330m long crest and 104m height from foundation.

Geodetic Deformation Survey networks of Upper and Lower Siah Bisheh Dams have been measured at 6 epochs from the time of operation. Geodetic Deformation Survey of Upper and Lower Siah Bisheh Dams covers the following networks for each dam independently:

- 3D network outside the dams;

- 3D network of target points on the dam bodies and spillwaies;

- 3D network of target points on the sliding area; and

- Levelling network of the points located outside and on the body of the dams.