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| Sr. | Term | Definition |
| 1 | Uniform Flow | Flow which has a constant depth, volume and shape along its course. |
| 2 | Uplift | (1) An upward force on earth due to water leaking into a dam or from any point where water is under high pressure. (2) Lifting of a structure caused by: frost heave, or on the windward side by wind force, or in a dry climate by swelling soil. |
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