Unh Water Treament Residual Lagoons dam
Unh Water Treament Residual Lagoons
The Unh Water Treatment Residual Lagoons in Durham, New Hampshire, are privately owned and regulated by the NHDES Dam Bureau. Completed in 2017, these Earth-type lagoons have a height of 5 feet and a storage capacity of 2.04 acre-feet, with a normal storage level of 0.68 acre-feet. The lagoons cover a surface area of 0.17 acres and serve a primary purpose that is categorized as 'Other'.
With a significant hazard potential and a moderate risk assessment rating of 3, the Unh Water Treatment Residual Lagoons are inspected regularly, with the last inspection conducted in October 2019. The lagoons are designed with an uncontrolled spillway type and do not have any associated locks or outlet gates. While their condition is currently rated as 'Not Rated', the lagoons do not have an Emergency Action Plan prepared or in place.
For water resource and climate enthusiasts, the Unh Water Treatment Residual Lagoons present an intriguing case study in private ownership and regulatory oversight. With their unique design features and risk assessment considerations, these lagoons offer valuable insights into the management of water treatment facilities and the importance of regular inspections and maintenance in ensuring public safety and environmental protection.
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.
- 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.
- 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.
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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Unh Water Treament Residual Lagoons -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Oyster River Near Durham | 13 cfs | → |
| Lamprey River Near Newmarket | 137 cfs | → |
| Isinglass R At Rochester Neck Rd | 66 cfs | → |
| Winnicut River At Greenland | 22 cfs | → |
| Cocheco River Near Rochester | 117 cfs | → |
| Exeter River At Haigh Road | 57 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Unh Water Treament Residual Lagoons.
Boat launches
- Oyster River Boat Launch
- Piscassic River Boat Launch
- Lamprey River Boat Launch
- Great Bay Boat Launch
- Piscataqua River Boat Launch
- Cathy Schiro O'Brien Cross Country Running Trail Dover
Campgrounds
- Old Stage Campground
- Remote Campsite
- Saddleback Campground
- Tidewater Campground
- Salisbury State Park Reservation
- Windham Town Forest Tent Platforms
Paddle runs
Track Unh Water Treament Residual Lagoons in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Unh Water Treament Residual Lagoons
Where does the data for Unh Water Treament Residual Lagoons come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Unh Water Treament Residual Lagoons.