Table 2.

The necessary processes for different systems.

Scenarios	Water supply	Drainage	Yellow water treatment	Brown water treatment	Solar power b
Scenario A	√a	√	×	×	×
Scenario B1	√	√	√	×	√
Scenario B2	√	√	√	×	×
Scenario C1	√	×	√	√	√
Scenario C2	√	×	√	√	×
Scenario C3	×	×	√	√	√
Scenario C4	×	×	√	√	×

^a√ = the scenario has this process, × = the scenario does not have this process.

^bSB1, SC1, and SC3 are powered by photovoltaic cells while other scenarios are powered by the grid.