Emergency Sewage Retention Pond No.2 Structure Reservoir Report

Last Updated: December 5, 2025

Emergency Sewage Retention Pond No.2 Structure, located in Fairfax, Virginia, is a crucial component of the local government's infrastructure for managing sewage in the area.


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Summary

This retention pond, with a height of 25 feet and a storage capacity of 140 acre-feet, plays a significant role in controlling the flow of wastewater and preventing potential environmental hazards. The structure is state-regulated and inspected regularly to ensure its functionality and compliance with safety standards.

Situated near a tributary to Bull Run, Emergency Sewage Retention Pond No.2 Structure is designed as an earth dam with a length of 1220 feet. Its primary purpose is for sewage retention, and it is considered to have a significant hazard potential. Despite not having a condition rating, the structure is equipped with emergency action plans to address any potential risks and ensure quick response in case of emergencies. The location and design of this retention pond reflect the importance of water resource management and climate resilience in the region.

Overall, Emergency Sewage Retention Pond No.2 Structure serves as a critical infrastructure for addressing sewage management needs in Fairfax, Virginia. With its state-regulated status and emergency preparedness measures in place, this structure plays a vital role in safeguarding the local environment and water resources. As climate change impacts continue to pose challenges to water infrastructure, structures like Emergency Sewage Retention Pond No.2 are essential for ensuring the resilience and sustainability of the community's wastewater management systems.

Dam Length

1220

Dam Height

25

River Or Stream

Tributary to Bull Run

Primary Dam Type

Earth

Hydraulic Height

25

Nid Storage

140

Structural Height

25

Hazard Potential

Significant

Nid Height

25
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.