RETROFIT DESIGN
Bicycle Shed
From the “before retrofit" pictures, we can see that the ground is made entirely of impermeable materials. Much of the stormwater from roofs and bike shed will become runoff and put pressure on municipal storm pipes. To solve this problem, we used interception ditch to channel rain water from the bicycle sheds into the rain barrels. At the same time, Concrete Gutter is installed at the junction of the building with the ground to store and slowly drain stormwater.
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This site has the same problem as the bicycle shed. To solve this problem, we designed a rain garden in the corner. Stormwater from the roof will be channelled into the rain garden through the gutter. At the same time, runoff from the ground will flow into the rain garden along the slope.
Northeast Corner
To reduce the total volume of runoff in the parking lot. We replaced the impermeable material of the ground with permeable bricks. At the same time, we also created a green belt where the building meets the parking lot. The green belt is highly permeable and can absorb stormwater from the building to a certain extent. In addition, to ensure the drainage ability of the green belt, the drainage grate was also upgraded.
Parking Lot
In order to ensure that the stormwater in the parking lot can be gradually discharged into the municipal stormwater system, we designed a stormwater chamber system. At the front of the system is a pretreatment system that removes particulate matter from stormwater. Stormwater will flow into the stormwater chamber through a pre-treatment system and permeable bricks. The chamber has a connection to maintain water level balance, as well as two small water pipes to let stormwater stored in the chamber and slowly drained into the municipal storm water system
Stormwater Chamber System
Rain Garden
The original flowerbeds were simple in design and could not provide landscaping and drainage functions. We transformed it into a stormwater garden by installing rain chains and drainage devices to give it more possibilities for landscape and drainage. At the same time, we have also prepared two sets of plans to ensure that this rain garden can face rains of different intensities.
Low-intensity Rainfall
Under low-intensity rainfall, stormwater from the roof will follow the rain chain into the rain garden. The stormwater in the rain garden will be stored in the tank after the pretreatment system. The stormwater in the storage tank will be discharged into the municipal stormwater system. At the same time, the runoff from the parking lot will also penetrate into the perforated pipe and will eventually be stored in the tank
High-intensity Rainfall
Under conditions of high-intensity rainfall, rain garden will have problems with high water levels and full tanks. To solve this problem, we designed an overflow control structure to ensure that the overflowing stormwater will be discharged into the municipal stormwater system.
Data Monitor Design
Flow Gauge - Discharge of Stormwater Pipe
Level Gauge- Water level of Stormwater Pipe
Rain Gauge- Rainfall Intensity
