How does stormwater get polluted?

Stormwater becomes polluted because it flows throughout cities and landscapes collecting pollutants, which it then carries into other waterways. When stormwater runoff can’t absorb into the ground because impervious surfaces like sidewalks and roads block absorption, it must continue to flow.

Areas with higher populations require more rigorous stormwater management because pollution is higher. Urban areas have more people, garbage, cars, pavement, flooding, and infrastructure which all lead to higher levels of pollution in stormwater.

What is the difference between a retention and detention pond?

The basic difference between retention and detention ponds are that retention ponds remain full/wet, whereas detention ponds dry out between storms.

How does a detention pond work?

Retention ponds work to control stormwater by retaining and treating contaminated stormwater runoff. Retention ponds naturally improve water quality and remove pollutants. They are surrounded by natural vegetation which helps prevent erosion. 

Retention ponds are fed by underground pipes, which allows high quantities of water to fill the pond. A small outlet allows some water to flow out so that the pond does not overflow.

Retention ponds have pros and cons like detention ponds. They are able to retain and improve water quality, are easy to create, and help form new habitats. They can also be used for recreational activities.

The disadvantages of retention ponds include a large land requirement. They can also negatively impact water quality if they are designed poorly.

Both detention ponds and retention ponds require maintenance to prevent flooding.

Are detention ponds hazardous?

Detention ponds can pose many safety hazards. These include drowning, exposure to contaminants, and a higher amount of mosquitos which can cause increased disease.

In order to prevent these hazards from causing a negative impact, detention ponds must be well maintained and built properly.

What is a detention easement?

A detention or drainage easement allows others to access and or use your property. Specifically, they allow part of your land to be set aside for drainage purposes to protect your home and surrounding areas from water damage.

Utility and governments can access the area to maintain drainage. You cannot use this area for structures or build impervious surfaces (like driveways) on it. You must also maintain the slope and keep the area maintained.