What are Green Streets ?
Green streets can be described as the sustainable design and development of a street hence transforming it into a well maintained and eco friendly social element taking into consideration functionality, aesthetics and economy .
Research shows that public streets and roads cover nearly one-third of our urban landscapes. However, often we tend to overlook that the massive impervious surfaces are also a high environmental polluter by depositing pollutants directly into streams and water bodies threatening natural habitat and species. since 1980s “nonpoint” pollution caused by runoff from impervious surfaces (such as roads, roofs, lawns, driveways, parking lots etc.) has gained much attention.
Benefits of Green Streets:
- Reduce runoff
- Treat stormwater
- Calm traffic
- Incorporated with sidewalks & parking
- Clean and cool air and water
- Enhance neighborhood livability
- Increase community and property values
- Enhance pedestrian and bicycle access and safety
- Protect valuable surface and groundwater resources
- Add urban green space and wildlife habitat
- At Portland ,Oregon.
- Started of as a surface stormwater management project
Case Study : San Mateo County
- Location : California
- Basic Aim: Controlling surface water runoff
- A standard curb cut allows storm water runoff to enter a parking lot rain garden. This curb cut has 45 degree chamfered sides.
- This flush concrete/stone pebbles along the roads allows storm water run off to enter .
- The 3 foot space between these wheelstops allows stormwater runoff to enter a vegetated earthen land.
- A standard curb with wings allows stormwater runoff to enter a stormwater facility. The wings help retain the side slope grade on each side of the curb cut opening.
- A grated curb cut allows stormwater to pass under a pedestrian egress zone to the stormwater facility
- We can utilize the roofs of structure like bus sheds by providing vegetation on the roof of the structure
- Another alternative is harvesting the rain water
- Helpful in areas where demolition is difficult
- CLIMATE: HEAVY RAINFALL
- TYPE OF STREET: UNDULATED TERRAIN WITH SLOPES
- PROBLEMS FACED:
1. LARGE AMOUNT OF STORMWATER
2. DAMAGES CAUSED BY THE HEAVY AMOUNT OF WATER COMING AS RUNOFF
- Recycled materials
- Permeable pavements
- Light-colored pavement
- Utilization of renewable sources of energy
- Optimizing parking space.
Precast-Concrete for Pavements
provides collection for ground water table with no pits formation
Cheaper as compared to permeable plastic mats
- These materials are nonporous (or impervious)
- collect oil, gasoline and other pollutants
- This runoff can cause steady landscape erosion.
- creating a “heat island” effect in urban environments.Heat island is due to high thermal radiations
- When rain collects on nonporous pavement, it runs off, carrying the oil from vehicles with it.
- Plastic pavers generally consist of the above components.
- locally available material may also be a part of green design.
- Mall road, Shimla ( only for pedestrian use )
- Solar street lights
- Banking of roads provides safety as well as means to collect rain water.
- Using by products like fly ash, bottom ash, boiler slag, and flue gas desulfurization gypsum.
- slag cement
- Significantly reduce concrete production
- Less carbon emissions.
- Utilizing waste products and avoiding dependence on non renewable source.