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INSIGHTS


CENTRAL LOCKING A lockable self-raising cover was developed by Jacobs for the central control chamber


of the amphitheatre into a sub-surface geo-cellular crate system. Once the sub-surface storage is full, water will pond on the surface of the amphitheatre, but can leave through a combination of the infiltration system and a piped outflow to the nearby surface water sewer network at a greatly reduced rate. In the event of a blockage of the outlet, a spillway can direct flows safely overland into the adjacent area of the parkland. Using this ‘blue-green infrastructure’ solution helps improve the water quality of the runoff as it filters through grass and stone media. We incorporated several innovative features and designs including a carefully developed step design to the tiered seating, a state-of-the-art, plastic-free grass product, and reinforced earth techniques to resist erosion. A lockable, self-raising cover and frame was developed to protect the central flow control chamber from any movement and make for easy-access maintenance. The dual-use approach used here is a model for how all projects should be conceived. Flood defences should benefit the community all year round as opposed to simply when there is a flood event. Maximising the use of blue-green infrastructure in our


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During extreme rainfall events, water intercepted from the highway will flow along the swale and infiltrate through the surface of the amphitheatre into a sub- surface geocellular crate system


public realm will provide wildlife habitats, local amenities, and mitigate some of the effects of our changing climate. Our green spaces are enormously valuable to local communities, providing mental health benefits, cleaning the air and water, and reducing the urban heat island effect for those living in our cities and urban spaces.


This culturally relevant solution integrates the vital stormwater management into a creative, environmentally sensitive, climate- resilient design – enhancing the local landscape and biodiversity, while functioning as a delightful performance venue and community recreation space now being fully enjoyed by all.


Paul Hargreaves is senior associate director of water, energy & environment at Jacobs


ADF SEPTEMBER 2023


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