Explanation
Installing concrete sidewalks and parking areas will increase the quantity of the rainwater that is discharged from a site. Rainwater is the water that falls as precipitation on a site. Rainwater discharge is the amount of rainwater that leaves a site as surface runoff or subsurface flow. Rainwater discharge can affect the quantity and quality of water resources downstream by causing erosion, flooding, sedimentation, pollution, and habitat loss. Concrete sidewalks and parking areas are examples of impervious surfaces that prevent rainwater from infiltrating into the soil and increase rainwater discharge by creating more runoff1 . References: LEED v4 Green Associate Candidate Handbook1, EPA's Stormwater Management

Stormwater runoff can indeed be treated and used in a facility's cooling towers. This is an example of using non-potable water (water that is not of drinking quality) for purposes that do not require potable water. Other uses for treated stormwater might include toilet flushing or irrigation. Reference: LEED Green Associate Candidate Handbook, U.S. Green Building Council resources

Conserving the Earth's potable water supply is a green building objective that can be achieved by utilizing high efficiency water fixtures. High efficiency water fixtures reduce the amount of water used for indoor plumbing, which reduces the demand on municipal water supply and wastewater systems. This also saves energy and money for the building owners and occupants. The LEED Green Associate Candidate Handbook states that one of the intents of the Water Efficiency category is to "reduce potable water use within buildings and for landscape irrigation" [1, p. 13]. Reference: LEED Green Associate Candidate Handbook, [Water Efficiency | U.S. Green Building Council]

The Integrative Process enables collaboration across disciplines from the earliest project phases, promoting synergy among systems and components. This leads to optimized performance and aligns with LEED's emphasis on holistic design.