Figure 4.39 Landscape Discharge

Although the restoration project was initiated to restore historical and environmental values, flood prevention and management issues become crucial as part of practicality for the project. The initial terrain of the river that is naturally prone to flooding has been utilised to securing the river as designated flood discharge area for the downtown. The municipality had set the designated target flood recurrence interval of 200 years for the design to solve. Another crucial intervention of the policy includes securing the water discharge system by excavating the underneath of both banks.

4.2.3.2 Feature 1: Landscape Discharge

Figure 4.39 Landscape Discharge Author, 2020

A considerable amount of underground sewerage was constructed beneath the stream since the river was used traditionally as part of the sewerage system for the city. It was a crucial challenge for the municipality to segregate the sewerage system and rainwater collection separately; thus, the decision was to adapt to the double-box system. Unpolluted rainwater will be discharged to the stream at times of overflow, and highly polluted water would be segregated into the separate pipeline while the sewerage will be treated as a combined system.