Dam Safety Management Best Practices

Dam Safety Management Best Practices: A Complete Guide for Municipalities, Small Utilities, and Private Dam Owners in Canada

This guide provides a clear overview of dam safety management, surveillance practices, emergency preparedness, and common risks. It also includes real examples from Atlantic Canada that show the impact of both strong and weak management practices.

Why Dam Safety Matters

Many dams operate quietly for years without incident. That quiet period often leads to neglect. Aging infrastructure, extreme weather, and limited budgets increase the likelihood of problems that could have been prevented.

Small dam owners face several common challenges:

• limited funding
• little in-house technical expertise
• competing infrastructure priorities
• lack of formal dam safety documents
• uncertainty about regulatory expectations

This guide helps owners understand what responsible dam management looks like.

Key Responsibilities of Dam Owners

The Canadian Dam Association (CDA) Dam Safety Guidelines make one point very clear: the owner is responsible for the safe management of a dam.

These responsibilities fall into five main areas.

1. Dam Safety Management

A strong Dam Safety Management System should include:

• clear safety policies
• documented authority and accountability
• proper dam classification
• reliable annual budget planning
• training for anyone involved in dam monitoring

Owners who don’t have internal expertise often choose to work with dam safety consultants under long-term service agreements. This provides consistency and expert oversight.

2. Operations, Maintenance and Surveillance (OMS)

A good OMS program prevents most problems before they begin. It should include:

• routine informal inspections
• formal annual inspections
• regular instrumentation readings
• documented maintenance schedules
• clear reporting procedures

Dams with strong OMS programs almost never fail without warning.

3. Emergency Preparedness

Every dam needs a functional Emergency Preparedness Plan (EPP). A strong EPP should include:

• up-to-date contact lists
• inundation mapping
• identification of downstream populations at risk
• clear procedures for operators and emergency responders
• regular testing and updates

Emergency plans have repeatedly saved lives during flood and dam-related events.

4. Dam Safety Reviews (DSRs)

DSRs are independent reviews conducted every five to ten years depending on the classification of the structure. A DSR typically includes:

• a detailed site visit
• review of design and construction
• assessment of OMS practices
• review of the EPP
• checks on dam classification
• identification of deficiencies and corrective actions

DSRs ensure that dams remain safe under current standards.

5. Ongoing Analysis and Assessment

Dams may be static, but the conditions that affect them are not.
Regulations change, infrastructure ages, and new development occurs downstream. Owners must periodically assess their dams to ensure they meet updated standards.

Case Study 1: When Dam Safety Management Breaks Down

A homogeneous embankment dam built in the 1890s developed a serious leak at the downstream toe. The leak had been flowing for almost two weeks before operators contacted a dam safety engineer.

Key issues included:

• no OMS manual
• no Emergency Preparedness Plan
• piezometers had never been read since installation
• staff trained only in water treatment, not dam surveillance
• no documentation of baseline conditions

When engineers arrived, they found:

• concentrated leakage
• a developing sinkhole
• fines in the seepage water
• saturated downstream toe areas
• visibly greener grass in a horizontal band

Because no baseline information was available, the engineers had to take a very conservative approach. This increased both cost and operational risk.

Cause:
An old 14-inch cast-iron conduit beneath the dam had deteriorated and created a direct pathway for water.

Outcome:
A failure was prevented, but mainly through luck. Routine inspections would likely have caught the issue long before it became dangerous.