Concrete dam instrumentation manual



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On May 31st, we join together to commemorate National Dam Safety Awareness Day.National Dam Safety Awareness Day was established in memoriam of the 2,220 people who lost their lives in the 1889 South Fork Dam failure near Johnston, Pennsylvania. The collapse of the South Fork Dam was a tragedy, but by no means was it an isolated incident.As we observe sầu the 132nd anniversary of the South Fork Dam tragedy, we encourage you to underst& the continuedimportance of dam safety, the role various parties play,currentissues, and why investment in this infrastructureis urgently needed.

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Photo: Wreckage after the flood in Johnstown, PA (via Library of Congress).For a technical look at this failure, view the South Fork Dam case study on

Dam Safety Issues & Challenges

Dams are a critical part of the nation’s infrastructure—equal in importance lớn bridges, roads, airports, & other major elements of infrastructure. Dams provide a life-sustaining resource to people in all United States regions; however, they must be maintained khổng lồ keep them safe. Failure or misoperation can result in the release of the reservoir contents - this includes water, mine wastes, or agricultural refuse - causing negative sầu impacts upstream or downstream or at locations remote from the dam. The negative impacts of primary concern are the loss of human life, economic loss including property damage, lifeline disruption, and environmental damage.This situation demands greater attentionand investment toreduce risks khổng lồ public safety and economic assets.

By 2030, seven out of 10 dams in the United States will be over 50 years old.While the age of a dam is not necessarily a direct indicator of its condition, it could indicate that it wasnot built lớn today"s standards.Occasional upgrade or rehabilitation is necessary due to lớn deterioration, changing technical standards, improved techniques, better understanding of the area"s precipitation conditions, & changes in downstream populations or land use.

ASDSO estimates that the total cost to rehabilitate the nation’s non-federal dams exceeds $65 billion. To rehabilitate just those dams categorized as most critical, or high-hazard potential, would cost over $20 billion, a cost that continues khổng lồ rise as maintenance, repair, and rehabilitation are delayed. Many dam owners, especially private dam owners, find it difficult to lớn finance rehabilitation projects. Investment is needed khổng lồ rehabilitate deficient dams và improve the efficacy of policies & regulatory programs that oversee dam safety programs.

There is an urgent need to invest in the safety of our dams. The May 20đôi mươi failure of the Edenville và Sanford Dams in Michiganshows the high cost the public pays when dam safety is not prioritized. When extreme rainfall caused the embankments to lớn fail, more than 10,000 people were forced to evacuate the area, và damages were estimated at$250 million.


Learn more about current issues và challenges và what we can bởi vì to improve sầu dam safety on the Roadmaps khổng lồ Reducing Dam Safety Risks Page.

Communication with the Public and Living with Dams

Intersecting almost all dam safety issues is the need forpublic education about dams. The ordinary citizen is unaware that the beautiful lakes on which they boat, ski, or fish are only there because of manmade dams. Developers build in dam-break flood inundation areas knowing nothing about the potential devastation an upstream dam could cause should it ever fail. In fact, some developers and zoning officials are completely unaware of dams within their community. Even if citizens understvà và are aware of dams, they still can be overly confident in the infallibility of these manmade structures. Living in dam-break flood-prone areas is a risk.

Living with Dams: Know Your Risks, was prepared by ASDSO lớn help address these issues & answer questions about dams includingwhat purposes they serve sầu, what risks are associated with dams, & where you can get information about how to react if you are affected by one.

A second booklet,Living with Dams: Extreme Rainfall Events, explains the engineering principles involved with predicting extreme rainfall events and how these principles are used to thiết kế safe, functional & economical dams. It connects the concepts of rain to lớn floods khổng lồ dams to failure and the flooding impacts downstream.

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Deep Dive into Dam Safety

For more information on dam safety topics, visit the liên kết below.

Roadmap to lớn Reducing Dam Safety Risks-Learn more about current issues and challenges, as well as what we can vì chưng to improve dam safety.

Access State Dam Safety Programs & Contacts-For state-specific dam safety details, visit ourbản đồ page và cliông chồng on your state.

Public Safety at Dams (Low-Head Dam Awareness)-Each year, dozens of lives are lost on America’slow-head or “run-of-the-river” dams. Aao ước the victims are boaters, kayakers, swimmers, anglers, and emergency responders.People are often unaware of these dangers, or they underestimate their risk of falling victlặng khổng lồ them.It is critically important lớn understvà the scope of this danger & be aware of the many ways you can keep yourself safe and avoid a tragedy.

ASCE Report Card for America"s Infrastructure-The American Society of Civil Engineers releases a report thẻ every four years & assigns grades for 17 infrastructure sectors, including dams và levees.ASCE released the 2021 Report Card for America"s Infrastructure on March 3rd & both damsand levees received a grade of D.

Dam Owner Academy: Dams 101 (Video)-"Dams 101" is the first in a series of educational videos for dam owners from ASDSO. This đoạn phim focuses on the types of dams & how they work. Although this Clip is part of the dam owner series, this video is suitable for anyone looking for an introduction khổng lồ dams. within this trang web are link khổng lồ individual case studies as well as lessons learned pages that summarize historical dam incidents and failures và the valuable information gleaned from them. Each page contains background và mô tả tìm kiếm, photographs, videos, best practices, & other resources related khổng lồ the case study or lessons learned being addressed.

ASDSO Awareness Center- This area of the ASDSOtrang web includes more information on dam basics.

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FEMA National Dam Safety Program -The National Dam Safety Program is a partnership of states, federal agencies and other stakeholders to encourage and promote the establishment và maintenance of effective federal và state dam safety programs to lớn reduce the risk to lớn human life, property, and the environment from dam related hazards.

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