Conceptual diagram of SB-RF operation model of flood control is shown as
Fig. 1. In the SB-RF model for flood control, the rainwater from block raft foundations
are collected or released from either rooftop systems or vacant lot systems. As illustrated
in Fig. 1a, the hypothetical rainwater drainage pipes collect water into the raft foundation
or release water out into the block street. As shown as Fig. 1b, the rainwater drainage
pipes have hypothetical flow control valves, R-valvet and V-valvet, that respectively
adjust the amount of rainwater collected and released