SYSTEM ANALYSIS

Total open space area: 9ha

Wetland treatment area: 12000m2 water storage pond

Water storage pond area: 16000m2 depth: 3m capacity: 48000m3

1. Wetland water treatment system: Increases diversity, improve water quality and provide wildlife habitats

2. The treatment wetland will perform its ecological function differently in each seasons.

Dry season: Wetlands store clean water filtered by complex systems for agricultural irrigation.

Rainy season: Wetlands provide space for stormwater runoff to gather and mitigate the effects of flooding and pollution.

Total open space area: 2ha

Raingarden area: 3600m2

Water storage pond area: 2700m2 depth: 2.5m capacity: 6750m3

The rainwater collected from the roof of the factories is filtered through a complex stormwater treatment system to obtain clean water. Clean water is then pumped to the households and factories. Then, stormwater runoff from the roads will be collected and diverted to a newly designed terraced raingarden, with the treated water being harvested for storage, irrigation and community-use.

Perspective 2

20 litres minimum requirement litres for drinking, eating, basic sanitation

50 litres minimum requirement litres for drinking, cooking, basic sanitation, laundry, bathing

Calculation of Potential Rainwater Supply (Roof rainwater harvesting)

Harvested Water (L) = Catchment Area (m 2 ) X Rainfall Depth (mm) X 0.623

Conversion Factor

27334000L/year = 17114000L/year (for factory) +

560 persons X 50 litres/capita/day X 365 (for household)

27334000L/year = 25000m2 X 1755mm X 0.623 Estimate

Total open space area: 0.3ha

Raingarden area: 255m2

Water storage pond area: 420m2 depth: 2m capacity:840m3

Perspective 3

water storage pond

The small raingarden is used to clean and filter stormwater runoff from roads naturally.

Playground

The rainwater is collected from individual households through the water pipes, and it is filtered and treated in the shared water shop to access clean water for household-use.

20 litres minimum requirement litres for drinking, eating, basic sanitation

50 litres minimum requirement litres for drinking, cooking, basic sanitation, laundry, bathing

Calculation of Potential Rainwater Supply (Roof rainwater harvesting)

Estimate 135 households

Average 4 persons pre household

540 persons

Harvested Water (L) = Catchment Area (m 2 ) X Rainfall Depth (mm) X 0.623

Conversion Factor

7106800L/year = 6500m 2 X 1755mm X 0.623

36 litres/capita/day

Application

Depending on the size of the sites, the project can be applied to other parts of Kendaung Kali Angke as a model to address the issue of water pollution and provide clean water.