Dewatering: Difference between revisions
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"[[Construction]] of many conventional water projects such as dams, dikes, [[canals]], [[siphons]], and pumping plants requires some degree of excavation, which often extends below the local water table. The excavation can be an expensive [[operation]], depending on the required depth, subsurface materials, and [[groundwater]] conditions. Water Removal and Control (WR&C) systems are often employed along with other techniques such as unwatering methods and/or [[cutoff]] walls in controlling the water and seepage within and surrounding the excavations. WR&C systems can be constructed by a variety of methods, either singly or in combinations, to effectively remove and control groundwater to facilitate excavation and construction activities 'in the dry' and to maintain [[stability]] of excavated slopes. Effective WR&C systems are also important to construction scheduling and safety of the construction crews, downstream populations and infrastructures, and the safety of the embankment dam itself."<ref name="DS13-21">[[Design Standards No. 13: Embankment Dams (Ch. 21: Water Removal and Control: Dewatering and Unwatering Systems) | Design Standards No. 13: Embankment Dams (Ch. 21: Water Removal and Control: Dewatering and Unwatering Systems), USBR, 2014]]</ref> | |||
"Design of WR&C systems should rely as much on experience as on the theory and calculations. Each site is unique, and no two systems will be exactly alike. Additionally, there is no one correct design, although some designs may be more applicable than others to specific site conditions. A well-suited design may include multiple features employing different technologies and configurations to achieve the desired goals."<ref name="DS13-21"/> | |||
==Best Practices Resources== | ==Best Practices Resources== | ||
{{Document Icon}} [[Design Standards No. 13: Embankment Dams (Ch. 21: Water Removal and Control: Dewatering and Unwatering Systems)|Design Standards No. 13: Embankment Dams (Ch. 21: Water Removal and Control: Dewatering and Unwatering Systems) (Bureau of Reclamation)]] | {{Document Icon}} [[Management of Water Control Systems (EM 1110-2-3600) | Management of Water Control Systems (EM 1110-2-3600), USACE, 2017]] | ||
{{Document Icon}} [[Design Standards No. 13: Embankment Dams (Ch. 21: Water Removal and Control: Dewatering and Unwatering Systems) | Design Standards No. 13: Embankment Dams (Ch. 21: Water Removal and Control: Dewatering and Unwatering Systems), USBR, 2014]] | |||
{{Document Icon}} [[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 2: Hydrologic Considerations) | Design Standards No. 14: Appurtenant Structures for Dams (Ch. 2: Hydrologic Considerations) (Bureau of Reclamation), USBR, 2013]] | |||
{{Document Icon}} [[Design of Small Dams | Design of Small Dams, USBR, 1987]] | |||
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Revision as of 17:14, 6 December 2022
"Construction of many conventional water projects such as dams, dikes, canals, siphons, and pumping plants requires some degree of excavation, which often extends below the local water table. The excavation can be an expensive operation, depending on the required depth, subsurface materials, and groundwater conditions. Water Removal and Control (WR&C) systems are often employed along with other techniques such as unwatering methods and/or cutoff walls in controlling the water and seepage within and surrounding the excavations. WR&C systems can be constructed by a variety of methods, either singly or in combinations, to effectively remove and control groundwater to facilitate excavation and construction activities 'in the dry' and to maintain stability of excavated slopes. Effective WR&C systems are also important to construction scheduling and safety of the construction crews, downstream populations and infrastructures, and the safety of the embankment dam itself."[1]
"Design of WR&C systems should rely as much on experience as on the theory and calculations. Each site is unique, and no two systems will be exactly alike. Additionally, there is no one correct design, although some designs may be more applicable than others to specific site conditions. A well-suited design may include multiple features employing different technologies and configurations to achieve the desired goals."[1]
Best Practices Resources
Management of Water Control Systems (EM 1110-2-3600), USACE, 2017
Design of Small Dams, USBR, 1987
Citations:
Revision ID: 4991
Revision Date: 12/06/2022