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Combined display of all available logs of ASDSO Dam Safety Toolbox. You can narrow down the view by selecting a log type, the username (case-sensitive), or the affected page (also case-sensitive).

23:47, 5 December 2022 Grichards talk contribs deleted page Relief Wells (content was: "__NOTOC__ Category:Seepage Surveillance and Monitoring ---- :“Relief wells are typically vertical drains placed to relieve uplift pressure at the downstream toe of an embankment. Piezometers are typically located equidistant between two wells. Under maximum hydraulic load, the piezometric level at the downstream toe of an embankment should be lower than th...", and the only contributor was "Grichards" (talk))
23:42, 5 December 2022 Grichards talk contribs created page Relief Wells (Created page with "__NOTOC__ Category:Seepage Surveillance and Monitoring ---- :“Relief wells are typically vertical drains placed to relieve uplift pressure at the downstream toe of an embankment. Piezometers are typically located equidistant between two wells. Under maximum hydraulic load, the piezometric level at the downstream toe of an embankment should be lower than the ground surface”.<ref name="EM 1110-2-1908">Instrumentation of Embankment Dams and Levees (EM 1110-2-1908...")
23:40, 5 December 2022 Grichards talk contribs created page Piezometers (Created page with "__NOTOC__ Category:Seepage Surveillance and Monitoring :“Applications for piezometers fall into two general categories – to monitor the pattern of water flow and to provide an index of soil strength. (a) Examples in the first category include determining groundwater conditions before construction, monitoring seepage pressure distribution, and determining the effectiveness of drains, relief wells, and seepage barriers. (b) In the second category, mea...")
23:37, 5 December 2022 Grichards talk contribs created page Weirs (Created page with "__NOTOC__ Category:Seepage Surveillance and Monitoring :“Weirs are preferred to flumes for measuring flow in small open channels at embankments because a weir traps sediment and debris possibly produced by internal erosion, increasing the likelihood the sediment is noticed. However, the open channel conveying the seepage must have enough vertical drop for a weir. If the channel grade does not allow the weir to function as an unsubmerged weir, a flume may be necess...")
21:18, 5 December 2022 Grichards talk contribs created page Initial Reservoir Filling and Surveillance Record (Created page with "__NOTOC__ Category:Record Keeping ---- "An initial reservoir filling and surveillance plan should be prepared by the design staff. Initial filling should be well documented, including a record of reservoir elevations and controlled water releases during the filling. The record should include complete written justification and design approval of any deviations from the planned filling. The surveillance record should include all information obtained from inspection...")
21:18, 5 December 2022 Grichards talk contribs created page Construction Record (Created page with "__NOTOC__ Category:Record Keeping ---- "All phases of the construction should be documented, including reporting of routine and special activities. Changes in construction plans and departures from expected site conditions should be documented, with any consequent design changes. The record should include information on materials and construction processes, field exploration and test results, geologic mapping of foundations and excavations, inspection records, as...")
21:17, 5 December 2022 Grichards talk contribs created page Design Record (Created page with "__NOTOC__ Category:Record Keeping ---- "Written documentation should be maintained in standardized format on all design-related information for the project. Planning design documentation should cover the project objectives and the studies made to locate, size, classify as to potential hazard, and select the type of dam and auxiliary facilities. Site investigation documentation should cover geologic mapping and studies made of the geologic and geotechnical explora...")
20:55, 5 December 2022 Grichards talk contribs deleted page O&M Activities (content was: "__NOTOC__ Category:Operation and Maintenance ----  Click to learn more <noautolinks>about</noautolinks> different operations and maintenance activities: * Record Keeping * Operating Procedures * Vegetation Management * Controlling Animal Activity * Repairing Concrete * Site Access * Inspections * Surveillance & M...")
20:45, 5 December 2022 Grichards talk contribs deleted page Owner Responsibilties (content was: "#REDIRECT Owner Responsibilities", and the only contributor was "Rmanwaring" (talk))
22:54, 2 December 2022 Grichards talk contribs created page Siphon Spillways (Created page with "__NOTOC__ Category:Controlled Spillways ---- “These types of control structures are suited for service, auxiliary and emergency spillways, and/or outlet works. Siphon spillways have been used to help pass excess inflows (i.e., augment other hydraulic structure discharge capacity). These spillways can be designed to be self-priming or manually primed. The siphon has relatively small discharge capacity (pressurized operations), limited ability to drain the reserv...")
22:30, 2 December 2022 Grichards talk contribs created page Fusegate Spillways (Created page with "__NOTOC__ Category:Controlled Spillways ---- “These types of control structures are associated with staged releases and suited for auxiliary and emergency spillways. Fusegate spillways are a proprietary system (Patented product of Hydroplus), and its inclusion in this design standard should not be viewed as an endorsement by Reclamation. This spillway type provides a means of passing more frequent smaller flood events by overtopping the fusegates (via labyrinth or...")
22:25, 2 December 2022 Grichards talk contribs created page Fuseplug Spillways (Created page with "__NOTOC__ Category:Controlled Spillways ---- “These types of control structures are associated with staged releases and suited for auxiliary and emergency spillways. A fuseplug control structure may include one or multiple bays containing the fuseplug embankments. The zoned embankments will be placed to a specified height and include a pilot channel through each embankment crest set to a specified elevation associated with a given flood eve...")
20:56, 2 December 2022 Grichards talk contribs created page Riprap (Created page with "__NOTOC__  Category:Overtopping Protection ----  "A riprap layer on the downstream slope of an embankment dam can generally provide some protection against the initiation of embankment erosion during overtopping flow. Riprap is generally composed of high quality quarried rock (often granite, volcanics, or limestone), or occasionally concrete rubble and is dump...")
20:54, 2 December 2022 Grichards talk contribs created page Synthetic Turf Revetments (Created page with "__NOTOC__  Category:Overtopping Protection ----  "An innovative erosion protection technology was developed in 2010 for embankment dams and levees that uses artificial or synthetic turf instead of natural grass or hard armor (i.e., RCC, ACBs, and rock riprap) to eliminate the long-term maintenance requirements and potential weaknesses of traditional vegetative...")
20:49, 2 December 2022 Grichards talk contribs created page Turf Reinforcement Mats (Created page with "__NOTOC__  Category:Overtopping Protection ----  "To improve upon the erosion protection provided by plain grass, turf reinforcement methods were developed to help protect the surface soil particles, grass seeds, and seedlings (especially during the period before full turf establishment) and improve the lateral continuity between grass plants. The development...")
20:44, 2 December 2022 Grichards talk contribs created page Vegetative Cover (Created page with "__NOTOC__  Category:Overtopping Protection ----  "Vegetative cover maintained on the downstream faces of embankment dams provides some protection against normal weathering effects and rill development due to rainfall. During small overtopping flows of short duration, vegetation can also provide protection against the initiation of concentrated erosion that can...")
20:39, 2 December 2022 Grichards talk contribs created page Gabions (Created page with "  __NOTOC__  Category:Overtopping Protection ----  "Gabions are rectangular-shaped baskets or mattresses fabricated from wire mesh, filled with rock, and assembled to form structures such as gravity retaining walls, lined channels, overflow weirs, hydraulic drop...")
20:35, 2 December 2022 Grichards talk contribs created page Precast Concrete Blocks (Created page with "__NOTOC__ Category:Overtopping Protection ----  "Precast concrete blocks can be used over earth materials to provide a hard surface for flow to pass safely without eroding the underlying surface, and are commonly referred to as articulating concrete blocks (ACB) when used for this purpose. An ACB system is comprised of a matrix of individual concrete blocks placed together to form an erosion-resistant revetment wit...")
20:24, 2 December 2022 Grichards talk contribs deleted page Articulated Concrete Blocks (content was: " __NOTOC__ Category:Overtopping Protection ---- {{Picture  |image=  |link=  |caption= }}  Paragraph text ==Examples...", and the only contributor was "Grichards" (talk))
20:21, 2 December 2022 Grichards talk contribs created page Concrete Slab (Created page with "  __NOTOC__  Category:Overtopping Protection ----  "Overtopping protection for embankment dams utilizing conventional or mass concrete relies on a continuous layer of concrete to serve as the flow surface for overtopping flows. This normally consists of a smooth...")
19:24, 2 December 2022 Grichards talk contribs created page Plunge Pools (Created page with "__NOTOC__ Category:Energy Dissipation ---- Plunge pools are energy dissipating devices located below the outlet of a spillway. Energy is dissipated as the discharge falls into the plunge pool as a free-flowing jet. Plunge pools are commonly lined with rock riprap or other material to prevent excessive erosion of the pool area. Discharge from the plunge pool should be at the natural streambed elevation. Typical problems may include movement of the riprap, loss of fine...")
19:23, 2 December 2022 Grichards talk contribs created page Baffled Chutes (Created page with "__NOTOC__ Category:Energy Dissipation ---- Baffled chutes require no initial tailwater to operate effectively and are located downstream of the control section. Multiple rows of baffle piers on the chute prevent excessive acceleration of the flow and prevent the damage that occurs from a high discharge velocity. A portion of the baffled chute usually extends below the streambed elevation to prevent undermining of the chute. <ref name="ASDSO">[https://damsafety.org/da...")
19:22, 2 December 2022 Grichards talk contribs created page Stilling Basins (Created page with "__NOTOC__ Category:Energy Dissipation ---- Type II and Type III stilling basins reduce the energy of the flow discharging from a spillway and allow the water to enter the outlet channel at a reduced velocity. Type II basins contain chute blocks at the upstream end and a dentated (tooth-like) endsill. Baffle piers are not used in a Type II basin because of the high velocity water entering the basin. Type III energy dissipators can be used if the entering flow velocit...")
19:22, 2 December 2022 Grichards talk contribs created page Impact Basins (Created page with "__NOTOC__ Category:Energy Dissipation ---- Concrete impact basins are energy dissipating devices located at the outlet of the spillway in which flow from the discharge conduit strikes a vertical hanging baffle. Energy dissipation occurs as the discharge strikes the baffle; thus, performance is not dependent on tailwater elevation. Most impact basins were designed by the NRCS and the USBR. <ref name="ASDSO">[https://damsafety.org/dam-owners/outlet-erosion-control-stru...")
19:21, 2 December 2022 Grichards talk contribs created page Headwalls/endwalls (Created page with "__NOTOC__ Category:Energy Dissipation ---- Headwalls/endwalls located at or close to the end of the discharge conduit provide support and reduce the potential for undermining. Headwalls/endwalls are typically made of concrete and should be founded on bedrock or have an adequate foundation footing to provide support for stability. A headwall/endwall can experience undermining and become displaced if not adequately designed. Displacement of the headwall/endwall can...")
19:03, 2 December 2022 Grichards talk contribs deleted page Spillway Conveyance (content was: "__NOTOC__ Category:Spillways ----  “Conveyance features located immediately upstream and downstream of a control structure include approach channels, inlet structures, chutes, conduits, and/or tunnels. These conveyance features pass flow from the reservoir to the control structure, as well as pass flow from the control structure to the terminal structure. The conveyance f...")
18:49, 2 December 2022 Grichards talk contribs deleted page Control Section (content was: "__NOTOC__ Category:Spillways ----  “A major component of a spillway is the control device, which regulates the outflows from the reservoir. A control device limits or prevents outflows below fixed reservoir levels and regulates releases when the reservoir rises above that level. A control structure may consist of a sill, weir, orifice, or pipe. The discharge-head relationship...")
17:46, 2 December 2022 Grichards talk contribs deleted page Spillway Approach (content was: "__NOTOC__ Category:Spillways ----  “Spillway approach configurations will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the spillway approach, each of which requires a different treatment at the abutments in order to provide a...")
03:10, 2 December 2022 Grichards talk contribs deleted page Siphon (content was: "Category:Outlet Configuration Outlet Works Many older dams were not constructed with a means of draining the reservoir. Lowering the reservoir may be needed for temporary construction, for emergency response, or when regular releases aren't needed. Siphons can be a low-cost means of providing a reservoir outlet if one does not exist. The key operational parameters are: (1) the required hydraulic lift cannot exceed the effective local atmospheric pressure adjusted fo...")
17:00, 30 November 2022 Rmanwaring talk contribs created page File:O'NielDam01.jpg (https://upload.wikimedia.org/wikipedia/commons/3/39/O%27NielDam01.jpg)
17:00, 30 November 2022 Rmanwaring talk contribs uploaded File:O'NielDam01.jpg (https://upload.wikimedia.org/wikipedia/commons/3/39/O%27NielDam01.jpg)
23:51, 29 November 2022 Rmanwaring talk contribs created page Linear vs. Non-linear (Created page with " __NOTOC__  Category: Global Stability of a Dam {| align="right" style="width:10%;" cellpadding="7" | 350px|x350px|link=https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/ |- |style="text-align:center; font-size:90%;"| Learn more...")
22:46, 28 November 2022 Grichards talk contribs moved page Timber Crib Dams to Timber Dams without leaving a redirect
22:17, 28 November 2022 Grichards talk contribs created page File:1.jpg
22:17, 28 November 2022 Grichards talk contribs uploaded File:1.jpg
23:14, 23 November 2022 Grichards talk contribs moved page Operations & Maintenance to Operation & Maintenance without leaving a redirect
23:01, 23 November 2022 Grichards talk contribs created page File:Westdam.jpg
23:01, 23 November 2022 Grichards talk contribs uploaded File:Westdam.jpg
22:54, 23 November 2022 Grichards talk contribs moved page About to About This Site without leaving a redirect
22:34, 23 November 2022 Grichards talk contribs deleted page References (content was: "#REDIRECT Best Practices Resources", and the only contributor was "Camrenbt" (talk))
22:19, 23 November 2022 Grichards talk contribs moved page Natural Resource Conservation Service to Natural Resources Conservation Service without leaving a redirect
16:25, 23 November 2022 Lkeby talk contribs deleted page TestPage (content was: "This is just a test", and the only contributor was "Lkeby" (talk))
16:25, 23 November 2022 Lkeby talk contribs created page TestPage (Created page with "This is just a test")
05:51, 18 November 2022 Grichards talk contribs deleted page Seismic Considerations (content was: "#REDIRECT Seismic", and the only contributor was "Camrenbt" (talk))
04:33, 18 November 2022 Grichards talk contribs deleted page Operations and Maintenance (content was: "#REDIRECT Operations & Maintenance", and the only contributor was "Rmanwaring" (talk))
22:17, 17 November 2022 Rmanwaring talk contribs created page Internal Stability (Stresses) (Created page with " __NOTOC__ ---- {| align="right" style="width:10%;" cellpadding="7" | 350px|x350px|link=https://damfailures.org/lessons-learned/concrete-gravity-dams-should-be-evaluated-to-accommodate-full-uplift/ |- |style="text-align:center; font-size:90%;"| Learn more about the need to consider uplift pressure when designing a gravity structure at [...")
19:20, 16 November 2022 User talk contribs changed group membership for Rmanwaring from bureaucrat, interface administrator, moderator and administrator to bureaucrat, interface administrator, moderator, administrator and suppressor
19:18, 16 November 2022 User talk contribs changed group membership for Rmanwaring from moderator to moderator, administrator, interface administrator and bureaucrat
23:55, 14 November 2022 Rmanwaring talk contribs created page File:Forces Gravity Dam.jpg (https://upload.wikimedia.org/wikipedia/commons/3/3e/Forces_Gravity_Dam.jpg)
23:55, 14 November 2022 Rmanwaring talk contribs uploaded File:Forces Gravity Dam.jpg (https://upload.wikimedia.org/wikipedia/commons/3/3e/Forces_Gravity_Dam.jpg)