STORMWATER MANAGEMENT

StormWater55

 

REGULATORY COMPLIANCE

Regulatory compliance with the EPA requires Strafford County to make their “Stormwater Management Program” (SWMP) publicly noticed. In addition, links to a number of informative bulletins from the NH Department of Environmental Services (NHDES) that cover best management practices for Stormwater Management are included for further reading as part of the County’s educational outreach.

  

WHAT IS STORMWATER

Stormwater is water from rain or melting snow that does not soak into the ground. In a forest, meadow, or other natural environment, stormwater usually soaks into the ground and is naturally filtered. When forests and meadows are developed, they are commonly replaced with impervious surfaces such as houses, buildings, roads and parking lots. Impervious surfaces prevent stormwater from soaking into the ground, which create excess stormwater runoff.    

Excess stormwater runoff can create problems when stream channels have to accommodate more flow than nature intended. When this happens, flooding is more frequent, banks erode, and the groundwater table is lowered. Stormwater can also become polluted with trash and debris, vehicle fluids, pesticides and fertilizers, pet waste, sediment, road salt and other pollutants when it flows over impervious surfaces, lawns, and other developed areas. These pollutants get picked up with the stormwater runoff and eventually flow untreated into nearby lakes, streams and other bodies of water.  The end result is to render these recreational and wildlife areas unsafe for swimming and creating an unsafe habitat for fish and other wildlife.

Stormwater pollution is one of the leading causes of water pollution nationally. Unlike pollution from industry or sewage treatment facilities, i.e., point source pollution, which is caused by a discrete number of sources that are easily identified, stormwater pollution is caused by the daily activities of people everywhere.

In New Hampshire, stormwater has been identified as contributing to over 90% of the surface water quality impairments in the state. All across New Hampshire, communities, businesses and property owners are experiencing the challenge of managing stormwater to protect the state’s water resources and to balance the need for a healthy environment with the need for social and economic growth.

  

EXCESSIVE STORMWATER RUNOFF IMPACTS

Excessive stormwater runoff can carry pollutants to receiving waters that impact a wide range of water quality issues including:

- Shellfish bed closures due to bacterial contamination.
- Swimming beach closures due to bacterial contamination.
- Pathogenic bacteria/viruses from fecal material in pet waste.
- Toxic cyanobacterial algal growth from excess nutrients in runoff.
- Toxicity from ammonia, metals, organic compounds, pesticides, and other contaminants.
- Depleted dissolved oxygen levels due to increased oxygen demand from biodegradable organic
  material – leading to oxygen deprivation of aquatic organisms.
- Contamination of groundwater aquifers with soluble organic chemicals, metals, nitrates, and salt.

 

COMPLIANCE DOCUMENTS

Strafford County Stormwater Management Program (SWMP)

Strafford County Illicit Discharge Detection and Elimination (IDDE) Plan

Strafford County NOI 9-13-2019

STRAFFORD COUNTY - 2018-2019 Annual Report

NH_MS4_Authorization_StraffordCo_NHR042002

 

STORMWATER MANAGEMENT FOR HOMEOWNERS

Virtually all water pollution problems in New Hampshire are caused by stormwater runoff from the roads we travel, the buildings and parking lots we visit, and even the homes in which we live. Every single property has the potential to contribute to water pollution. Every property owner can also be part of the solution to water pollution. NHDES has created a comprehensive guidance document and a hands-on voluntary program to assist New Hampshire home and small business owners in reducing water pollution.

https://www.des.nh.gov/organization/commissioner/pip/publications/wd/documents/wd-11-11.pdf

ADDITIONAL INFORMATION AND RESOURCE LINKS

City of Dover link on managing Pet Waste 

Managing septic systems

Full NHDES “Stormwater” website with links