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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).

22:45, 7 September 2022 Rmanwaring talk contribs created page Uncontrolled Spillways (Created page with "__NOTOC__ ----  “A controlled crest is one that includes gates which are used to control the flow; the uncontrolled crest is one unencumbered by gates”.<ref name="EM 1110-2-1603"> EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992</ref> “Common to all uncontrolled spillways that are not integral with a concret...")
18:03, 7 September 2022 User talk contribs changed group membership for Leby from (none) to administrator, interface administrator and bureaucrat (developer rights)
17:31, 7 September 2022 Rmanwaring talk contribs created page Controlled Spillways (Created page with "__NOTOC__ ----  “A controlled crest is one that includes gates which are used to control the flow; the uncontrolled crest is one unencumbered by gates” (EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992). “Controlled spillways include crest gates that serve as a movable damming surface allowing the spillway crest to be located below the normal operating level...")
17:20, 7 September 2022 Rmanwaring talk contribs created page Energy Dissipation (Created page with "__NOTOC__ ----  “Terminal structures located immediately downstream of the conveyance feature include stilling basins, energy dissipaters, and flip buckets. These structures are intended to dissipate or manage the kinetic energy of the flow, so it can be returned to the river or stream without significant scour or erosion that could damage or fail the dam and appurtenant s...")
17:15, 7 September 2022 Rmanwaring talk contribs created page Spillway Conveyance (Created page with "__NOTOC__ ----  “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 feature (such as an a...")
17:11, 7 September 2022 Rmanwaring talk contribs created page Control Section (Created page with "__NOTOC__ ----  “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 may be fixed, a...")
16:08, 7 September 2022 Rmanwaring talk contribs created page Spillway Approach (Created page with "__NOTOC__ ----  “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 acceptable spillw...")
15:58, 7 September 2022 Rmanwaring talk contribs created page Spillways (Created page with "__NOTOC__ ----  “The basic purpose of the spillway is to provide a means of controlling the flow and providing conveyance from reservoir to tailwater for all flood discharges up to the spillway design flood (SDF). The spillway can be used to provide flood=control regulation for floods either in combination with flood-control sluices or outlet works, or in some cases, as th...")
15:42, 7 September 2022 Rmanwaring talk contribs created page O&M of Gates/Bulkheads (Created page with "__NOTOC__ ----  “Steel-on-steel bearings require lubrication at regular intervals. Lubricants that contain rust-inhibiting compounds are desirable. Lubrication should be considered for some maintenance-free bearings because friction is reduced, the lubrication acts as a seal to prevent dirt from entering the bearing, and corrosion protection is increased. Certain types of...")
15:40, 7 September 2022 Rmanwaring talk contribs created page Design and Construction of Gates/Bulkheads (Created page with "__NOTOC__ ----  ==Bulkheads== “A bulkhead or stoplog and guides should be provided at the entrance to each water passage for dewatering the service and emergency gates for maintenance except when they are excessively costly or clearly unfeasible and other means can be improvised. When emergency gates are not required, stoplog or bulkhead guides for maintenance should alway...")
15:35, 7 September 2022 Rmanwaring talk contribs created page Gates/Bulkheads (Created page with "__NOTOC__ ----  To learn more about gates and bulkheads, click the following links: ==Components of Gates/Bulkheads== While there are many different types and sizes of gates and bulkheads, they often share similar components. These can include gate slots, gate recesses, gate seats, passageway liners, and air vents. Additionally, it is often required to design and construct...")
23:11, 6 September 2022 Rmanwaring talk contribs created page Decommissioning of Outlet Works (Created page with "__NOTOC__ ----  “When the existing conduit deteriorates to a point where it can no longer serve its intended design purpose, a decision must be made to renovate, remove/replace, or to abandon it. In some cases, the designer may find it technically and economically more feasible to abandon the conduit by grouting it closed and leaving it in place. For instance, abandonment...")
21:48, 6 September 2022 Rmanwaring talk contribs created page O&M of Outlet Works (Created page with "__NOTOC__ ----  The necessity to perform controlled releases of stored water for water supply and regulation, recreation, flood risk management, irrigation, navigation, and environmental purposes via the outlet works makes its operation and maintenance one of the most important topics in dam safety. “Spillways and outlet works are necessary to provide capability to release...")
21:39, 6 September 2022 Rmanwaring talk contribs created page Design and Construction of Outlet Works (Created page with "__NOTOC__ ----  ==Outlet Works Sizing and Capacity== “The sizing of the outlet works should take into account the possibility of using it to reduce the size or frequency of spillway discharges. The necessity of emergency drawdown capability and low flow discharge capability should be considered during the outlet works planning phase. The selection of type and arrangement o...")
21:25, 6 September 2022 Rmanwaring talk contribs created page Outlet Works (Created page with "__NOTOC__ ----  “An outlet works is a combination of structures and equipment required for the safe operation and control of water released from a reservoir to serve various purposes (i.e., regulating stream flow and quality; releasing floodwater, providing irrigation, municipal, and/or industrial water)”.<ref name="FEMA Outlet Works">Technical Manual: Outlet Works Ene...")
21:14, 6 September 2022 Rmanwaring talk contribs created page Water Conveyance (Created page with "__NOTOC__ ----  Water conveyance is an important and essential design component of a dam for a variety of reasons including: the consumption of water resources, the controlled release of attenuated flood surges during large precipitation events, regular environmental releases for maintaining riverine ecosystem health, hydropower generation, or emergency drawdown of the reser...")
20:40, 6 September 2022 Rmanwaring talk contribs created page Design and Construction of Arch Dams (Created page with "__NOTOC__ ----  “Unlike a concrete gravity dam which carries the entire load by its self weight, an arch dam obtains its stability by both the self weight and, to a great extent, by transmitting the imposed loads by arch action into the valley walls. The geometry of the dam site is, therefore, the most basic consideration in the selection of an arch dam. As a general rule,...")
20:34, 6 September 2022 Rmanwaring talk contribs created page Design and Construction of Gravity Dams (Created page with "__NOTOC__ ----  “Basically, gravity dams are solid concrete structures that maintain their stability against design loads from the geometric shape and the mass and strength of the concrete. Generally, they are constructed on a straight axis, but may be slightly curved or angled to accommodate the specific site conditions. Gravity dams typically consist of a nonoverflow sec...")
20:27, 6 September 2022 Rmanwaring talk contribs created page Decommissioning (Created page with "__NOTOC__ ----  Dam owners and project stakeholders continually weigh the maintenance costs associated with safely operating a dam against its useful benefits. Negative effects of aging dams can include the risk of a dam failure, an accumulation of river sediment and loss of useful reservoir storage, the continued prevention of fish passage, the continued alteration of downs...")
20:22, 6 September 2022 Rmanwaring talk contribs created page Hydrologic Surveillance & Monitoring (Created page with "__NOTOC__ ----  Page Summary ==Other Headings== Info ==Examples== {{Website Icon}} ==Best Practices Resources== {{Document Icon}} ==Trainings== {{Video Icon}} <!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations...")
20:21, 6 September 2022 Rmanwaring talk contribs created page Settlement (Created page with "__NOTOC__ ----  Page Summary ==Other Headings== Info ==Examples== {{Website Icon}} ==Best Practices Resources== {{Document Icon}} ==Trainings== {{Video Icon}} <!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations...")
20:14, 6 September 2022 Rmanwaring talk contribs created page Seepage Surveillance & Monitoring (Created page with "__NOTOC__ ----  Nearly every dam experiences seepage to varying degrees. Depending on the type of dam and its unique site conditions, seepage may go through, underneath, or around the dam. When left unchecked, excessive seepage can lead to problems such as internal erosion and eventual failure of either the dam itself or other vital components of the dam. According to the As...")
20:05, 6 September 2022 Rmanwaring talk contribs created page Inspections (Created page with "__NOTOC__ ----  As with any other structure, dams require regular inspections to identify and prevent any damage or deterioration of its many components. The regularity with which a dam may require inspection depends on the jurisdiction of any regulatory agencies as well as the hazard potential classification of the dam. Inspections can range from those required by dam saf...")
19:42, 6 September 2022 Cort talk contribs created page Inflow Design Flood (Created page with "__NOTOC__ ---- According to the Association of State Dam Safety Officials (ASDSO), the most common dam failure incident mechanism between 2010 and 2019 was dam overtopping.<ref name="ASDSO">ASDSO, 2022, https://damsafety.org/dam-failures</ref> The dam spillway, and its Inflow Design Flood (IDF), must have sufficient capacity and freeboard to prevent overtopping from occurring. “Selection of an IDF can involve tradeoffs in trying to satisfy multiple objectives includ...")
19:40, 6 September 2022 Cort talk contribs created page Borrow Investigation (Created page with "__NOTOC__ ---- Earthen embankment dams are most cost effective if the material is extracted from the proposed reservoir location. Not only are transportation costs of the material minimized, but the material volume can then be added to the total eventual water storage of the reservoir once filled. Additionally, sourcing the borrow material from within the proposed reservoir reduces the impact of excavation and extraction of native soils from locations that will not be in...")
19:09, 6 September 2022 Rmanwaring talk contribs moved page Dams National Engineering Handbook: Chapter 45 - Filter Diaphragms to Dams National Engineering Handbook: Chapter 45- Filter Diaphragms over redirect
19:09, 6 September 2022 Rmanwaring talk contribs deleted redirect Dams National Engineering Handbook: Chapter 45- Filter Diaphragms by overwriting (Deleted to make way for move from "Dams National Engineering Handbook: Chapter 45 - Filter Diaphragms")
19:08, 6 September 2022 Rmanwaring talk contribs moved page Dams National Engineering Handbook: Chapter 45- Filter Diaphragms to Dams National Engineering Handbook: Chapter 45 - Filter Diaphragms
17:46, 6 September 2022 User talk contribs changed group membership for Pcampana from (none) to moderator
21:27, 5 September 2022 User account Pcampana talk contribs was created
15:26, 2 September 2022 Rmanwaring talk contribs created page Foundation Evaluation (Created page with "__NOTOC__ ----  According to the Association of State Dam Safety Officials (ASDSO), the five most likely causes of dam failures are: overtopping, foundation defects, cracking, inadequate maintenance and upkeep, and piping. In order to prevent a dam failure, a properly designed foundation is essential. “The earth embankment and its foundation must be stable and withstand...")
15:10, 2 September 2022 User account Cort talk contribs was created
23:28, 1 September 2022 Rmanwaring talk contribs created page Geotechnical Exploration (Created page with "__NOTOC__ ----  Before any construction or design work can be completed at a potential dam site, conducting geotechnical subsurface and onsite material exploration is essential. These explorations consist of both invasive and non-invasive sampling methods. Invasive geotechnical sampling methods may include drilling boreholes and taking core samples from the overburden and be...")
22:06, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Extreme Precipitation and Dam Safety in a Changing Climate (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2022 |abstract=  PDH's: This webinar is eligible for 2 PDH credits. Essential to dam design and dam safety is the reliable assessment of hydrometeorological hazards such as extreme precipitation events and associated flooding. The traditional methods for assessing these hazards, such as estima...")
22:06, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Rehabilitation of NRCS Watershed Structures – A Consultant’s Perspective (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2022 |abstract=  This course will focus on the history, process, and technical requirements of the National Watershed Rehabilitation Program and, more specifically, a review of key technical requirements associated with the design and investigation of dams and spillways following Natural Resour...")
22:06, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Findings of the Independent Forensic Investigation of the Failures of Edenville and Sanford Dams, Michigan (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2022 |abstract=  This webinar will summarize the findings of the Independent Forensic Team (IFT) tasked with investigating the May 19, 2020 failures of the Edenville and Sanford Dams in Michigan. The chronology of events leading up to the dam failures will be detailed. The likely physical mecha...")
22:06, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Concrete Construction - Issues and Remedies (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2022 |abstract=  Spillways and outlet works are critical structures to the operation of a dam, and each of these features has its own unique design details and construction requirements. Even the best and most experienced contractors don’t always get it right. This webinar will focus on the...")
22:06, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Inspection and Assessment of Spillways (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2022 |abstract=  The February 2017 incident involving both the principal and auxiliary spillways of Oroville Dam in California brought considerable attention to potential failure modes associated with both structural and unlined spillways. Based on the lessons learned from this event and the su...")
22:06, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Specialty Construction Techniques for Foundation Improvement and Seepage Reduction (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2022 |abstract=  This course reviews the applicability of the wide range of specialty geotechnical construction techniques used in rock and soil foundations under dams and levees. These techniques are employed to provide seepage reduction and improve soils susceptible to seismicity or are other...")
21:53, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: The History of Dam Safety Governance in the US Including Risk Analysis (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2022 |abstract=  This webinar will review the history of dam safety governance development in the US from 1876 to present day. The governance development timeline will place key failures and incidents into perspective and show how such events triggered state and federal laws and the development...")
21:53, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Stream Management for Dam Construction (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  Rehabilitation of dams may involve access to the upstream side of the dam. Under such conditions, management of the river to keep the upstream area dry for construction activities is required. Cofferdams are typically used to capture river discharges and route to the bypass. Co...")
21:53, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Understanding and Managing Plant and Animal Intrusions in Embankment Dams and Levees – II (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  This two-hour webinar builds upon a previous webinar given in 2015 and highlights the results of recent research and policies developed with respect to plant and animal intrusions into dam and levee embankments. Intrusions by plants and animals into water-retaining embankments...")
21:42, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Current Trends in the Seismic Analysis of Embankment Dams (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  Earthquakes represent a significant hazard to dams in many parts of the United States and the world, and are a key consideration in the safe design and construction of dams. A key aspect of earthquake risk mitigation for dams is reliable seismic analysis of the expected perform...")
21:42, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Uplift and Drainage for Concrete Dams and Spillways (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  This course will discuss the impact of uplift on concrete dams and spillways, the benefits of drainage, the design of drainage systems, and the evaluation of drainage systems. Case histories related to drainage issues at concrete dams and spillways will also be presented. Poten...")
21:42, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Use of Underwater Remote Systems in Dam Safety (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  This course will include specifications on various pieces of equipment, both on the high and lower end of pricing, including benefits and shortcomings used during underwater inspections and surveys. These will range from ROV, AUV, wheeled and tracked crawlers, to different typ...")
21:42, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Use of Remote Sensing in Dam Safety-Including Drones (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  This course presents current technologies and discusses the application of them to the dams community. It focuses heavily on the integration of drones technology at dam sites but also on a number of other technologies, including but not limited to 360 cameras, mobile data coll...")
21:16, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Introduction to Spillway Gates (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  This course will provide an introduction to spillway gates, including an overview of different types of spillway gates. The key components of a gate condition assessment will be discussed. This course will cover how gate modeling has changed over time and the major items that h...")
21:16, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Inlet and Outlet Hydraulics for Spillways and Outlet Structures (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  This webinar will begin with an overview of hydraulic grade lines and head losses associated with outlet structures and spillways for dams. The hydraulic structure must be designed to carry the planned flow for the expected head and tailwater conditions. Selection of the most...")
21:16, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: What Can I Really Expect to Get Out of a Semi-Quantitative Risk Analyses (SQRA)? (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  This webinar will provide owners, consultants, and regulators an understanding of the benefits and limitations of an SQRA, what the results mean, and how the results can be used to prioritize actions in your dam or levee safety program. Dam and levee safety risk analyses have b...")
21:16, 19 August 2022 Camrenbt talk contribs created page On-Demand Webinar: Drilling Plans and Hazard Evaluations for Dams and Levees (Created page with "{{Trainings Template |author=  Association of State Dam Safety Officials |year=  2021 |abstract=  Drilling into, in close proximity to, or through dams, levees, and their foundations may pose significant risk to the structures. Damage created by hydraulic fracturing and other means during the drilling process (use of inappropriate drilling methods), improper in-situ samplin...")