New Castle County Water Farm Wastewater Lagoon Reservoir Report

Last Updated: December 5, 2025

The New Castle County Water Farm Wastewater Lagoon, located in Mathews Corner, Delaware, plays a crucial role in managing water resources in the region.


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Summary

This gravity dam structure, standing at a height of 28.86 feet and stretching 4300 feet in length, serves as a key component in the local water management infrastructure. With a storage capacity of 448 acre-feet and a surface area of 15.51 acres, this lagoon ensures efficient wastewater storage and treatment for the surrounding area.

Despite being classified as having a high hazard potential, the New Castle County Water Farm Wastewater Lagoon is reported to be in fair condition as of its last assessment in July 2008. The structure is owned and operated by the local government, with no state regulatory oversight. It is situated near the Appoquinimink River and has a drainage area of 0.64 square miles. Although no spillway is present, the lagoon has a maximum storage capacity of 448 acre-feet, highlighting its importance in flood control and water resource management in the region.

Dam Length

4300

Dam Height

28.86

River Or Stream

APPOQUINIMINK RIVER-OS

Primary Dam Type

Gravity

Surface Area

15.51

Drainage Area

0.64

Nid Storage

448

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

29
       
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.