Green Plazas Plazas are not often thought about as opportunities for stormwater infiltration, but when well planned and designed correctly, they can provide an excellent solution in a more formal environment. The majority of a green plaza is hardscaped with pervious pavers. Infiltration planters with shade trees and lawn areas are strategically located for
maximum pedestrian comfort and infiltration benefit. If necessary or desirable, a cistern can be located under the plaza and drainage channels can be integrated into the paving pattern to collect excess runoff and send it to the cistern for later use in irrigation. Lawn and Planted Areas
Shade Trees
Capture rain; recharge groundwater levels through detention and infiltration; store overflow from cistern
Capture rain, filter air, provide shade
Roof Overflow Drain Transfers overflow from adjacent green roof to underground cistern
Underground Cistern Collects stormwater runoff from plaza and adjacent building; irrigates plaza plants
Promote green plazas within activity centers to provide civic gathering spaces that also promote light imprint solutions to stormwater management.
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Town of Londonderry, New Hampshire
Drainage Trench Collects stormwater runoff from impermeable areas of plaza, drains to cistern
For large private development projects, require the construction of civic spaces that use light imprint techniques.