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Table 4

Investment and annual operation and maintenance cost for the implementation of the treatment systems for rainwater (US$)

Scenario	Investment							Annual O&M costs
Scenario	FFD^a	GOT^b	ASF^c	CD^d	WST^e	PWDS^f	Total	Annual O&M costs
Roofs	450	2,048	9,528	964	26,604	2,975	42,569	906
Maneuvering yard	–	–	10,152	964	23,789	2,843	37,745	1,146
Both	450	2,048	10,389	964	18,616	2,843	35,302	1,682

Scenario	Investment							Annual O&M costs
Scenario	FFD^a	GOT^b	ASF^c	CD^d	WST^e	PWDS^f	Total	Annual O&M costs
Roofs	450	2,048	9,528	964	26,604	2,975	42,569	906
Maneuvering yard	–	–	10,152	964	23,789	2,843	37,745	1,146
Both	450	2,048	10,389	964	18,616	2,843	35,302	1,682

^aFirst-flush diverters.

^bGrease and oil traps.

^cAnthracite-sand filter.

^dChlorine dosifiers.

^eWater storage tanks.

^fPumping and water distribution system.