Inlet protection is the last line of defense in preventing sediment from entering storm drain inlets and reaching our waterways. It should never be used as the only Best Management Practice (BMP), and often, if it fails, it is because there is not enough stormwater controls above the inlet to keep sediment on site. One of the common misconceptions about inlet protection is that it is meant to completely block off the inlet. Inlet protection should NEVER completely block off an inlet; not only can this be a safety hazard by flooding the roadway, it is ineffective because the sediment-laden water will just pass by to the next inlet. Instead, inlet protection is meant to slow the water flowing in the curb, shallowly pooling it to allow some of the sediment to drop out. Inlet protection can be constructed from rock socks, sediment control logs, silt fence, block and rock socks, or other materials. There are also numerous proprietary products available. The type of inlet protection you choose should depend on where your inlet is located.
Inlet protection in sump conditions
For inlets located in a sump, that is, at the low point of an area or a curb, it is important that the inlet continue to function during larger runoff events. For curb inlets, the maximum height of the protective barrier should be lower than the top of the curb opening to allow overflow into the inlet during larger storms. For area inlets, silt fence or other materials can be used to keep sediment-laden water out of the inlet. Just remember that if there is no overflow to the inlet, your site will experience some localized flooding.
Inlet Protection on Grade
If you inlet is located on a sloped street, instead of blocking off the inlet, you might try using curb socks in the flow line of the gutter uphill from the inlet. This will slow down the stormwater and give the sediment a chance to drop out before it reaches the inlet without blocking off the inlet.
For more information on inlet protection, see design details here from the Urban Drainage and Flood Control District IP-1 Urban Storm Drainage Criteria Manual Volume 3
The City of Scottsbluff has been selected by the Nebraska Forest Service as a member community in the Greener Nebraska Towns (GNT) Program. This program is designed to improvethe long-term sustainability of member communities. Scottsbluff will be receiving a total of $55,000 in grant funding, $30,000 of which will be allocated to tree planting, and $25,000 of which is to be spent on waterwise landscaping and stormwater management. We will be implementing demonstration projects that incorporate sustainable landscaping, tree planting, and stormwater best management practices, such as rain gardens, bioswales, and porous pavement. We will also be working with residents to plant trees and improve irrigation efficiency. Stay tuned to hear more about everything that we will be undertaking as part of this initiative!
Silt fence can be a very effective best management practice if it is used correctly. However, it is also one of the most misused and overused BMPs. Using silt fence incorrectly is not only ineffective, it can also be expensive. Here are some tips for using silt fence appropriately:
Note: This post describes the rain garden demonstration project which was installed in Scottsbluff in July 2010 with the help of the UNL Extension Stormwater Team. The garden is located on the corner of 19th Street and Avenue B.
Step 1 Choosing the Site
Rain gardens are designed to catch runoff from roofs, driveways, streets, sidewalks, or other areas of the lawn. This was an excellent site for a rain garden because of the downspout that drains into the area. Minimum work was needed to channel the runoff into the rain garden. Continue reading How to Install a Rain Garden
Review your home for stormwater handling. If your gutter, downspout, driveway or deck directly discharges into a water body, retrofit it by redirecting the runoff onto a grassy area or installing a berm/swale system. Or even install a Rain Barrel.
Design your landscaping to limit water use. Install a Rain Garden.
If you have an irrigation system, make sure it is in good working order and limit its use to actual watering needs. Install rain sensors into your irrigation system.
Consider replacing impervious surfaces like sidewalks, decks and driveways around your home with more pervious materials or methods like mulch, turf block, pervious concrete or clean stone.
Retain shrubby vegetation along waterfronts to prevent erosion and help stop heavy rain sheetflow.
Never dispose of oils, pesticides or other chemicals onto driveways, roadways or storm drains. The next rain will either carry it into a surface water or help it soak into our drinking water.
Reduce the amount of fertilizers, pesticides and herbicides you apply to your lawn and landscaping. What the plants can’t absorb quickly usually results in surface or groundwater pollution.
Litter disposed of in a storm drain can choke, suffocate and disable aquatic life. Dispose of your litter by throwing it in a trash can or recycling it. In addition, do your part by properly disposing of litter you find in the street or on the sidewalk.
Washing your car
Washing your car in the driveway creates a runoff of soap and other chemicals that ends up in the nearest storm drain. You can either take your car to a self-service car wash, which is designed with special drains for proper disposal, or wash your car on your lawn. The dirt below will act as a filter for the soap.
A rain garden is a garden of native shrubs, perennials, and flowers planted in a small depression, which is generally formed on a natural slope. It is designed to temporarily hold and soak in rain water runoff that flows from roofs, driveways, patios or lawns.