Explanation
The WaterSense label or local equivalent requirement in Water Efficiency Prerequisite, Indoor Water Use Reduction ensures that eligible newly installed plumbing fixtures will be both water efficient and high performing. The WaterSense label is a voluntary program by the U.S. Environmental Protection Agency (EPA) that identifies and promotes water-efficient products that meet EPA's specifications for water efficiency and performance. The label applies to tank-type toilets, water-using urinals, private lavatory faucets, and showerheads. For projects outside the U.S., local equivalents may be used if they meet the same criteria as WaterSense or are listed on the USGBC website. The label does not imply that the fixtures are LEED compliant, comply with mandatory federal government regulations, or comply with all international plumbing system requirements. References:
Water Efficiency Prerequisite: Indoor Water Use Reduction in LEED BD+C: New Construction v4.1 - LEED v4.11 What is the WaterSense Label and How Does it Apply?2 LEED QUALIFICATION GUIDE - v43 WaterSense Labeled Homes4

Explanation
This option requires the project to include all parking spaces that are outside the project boundary but are used by the project occupants, visitors, or customers in the calculations for the reduced parking footprint credit1.
This option ensures that the project accounts for the total parking demand and supply associated with the project, regardless of the location of the parking spaces2.
References: = [LEED v4: Building Design + Construction Guide], NC-v4 LTc7: Reduced parking footprint | LEEDuser.

Explanation
Building Product Disclosure and Optimization is based on market transparency, which means providing information about the environmental and social impacts of the products and materials used in the building. The LEED v4 Reference Guide for Building Design and Construction states that "the intent of this credit category is to encourage the use of products and materials for which life-cycle information is available and that have environmentally, economically, and socially preferable life-cycle impacts"1. By disclosing the information about the product ingredients, environmental product declarations, sourcing of raw materials, and material ingredients optimization, the project team can make informed decisions and support the development of a more sustainable market.
References:
* LEED v4 Reference Guide for Building Design and Construction, Materials and Resources Credit:
Building Product Disclosure and Optimization - Environmental Product Declarations, page 5462
* LEED v4 Reference Guide for Building Design and Construction, Materials and Resources Credit:
Building Product Disclosure and Optimization - Sourcing of Raw Materials, page 5502
* LEED v4 Reference Guide for Building Design and Construction, Materials and Resources Credit:
Building Product Disclosure and Optimization - Material Ingredients, page 5542

Explanation
Makeup water meters, conductivity controllers and overflow alarms
According to the Water Efficiency Prerequisite for Indoor Water Use Reduction, cooling towers and evaporative condensers must be equipped with makeup water meters, conductivity controllers and overflow alarms to reduce water consumption and prevent water waste. These devices help monitor and control the water quality, flow rate and level of the cooling system, and alert the operators of any malfunctions or leaks.
References: As per the LEED AP Building Design + Construction (LEED AP BD+C) V4 resources, the installation of makeup water meters, conductivity controllers and overflow alarms is a requirement for cooling towers and evaporative condensers under the Water Efficiency Prerequisite for Indoor Water Use Reduction.
This prerequisite aims to reduce indoor water consumption by setting baseline and efficiency standards for fixtures, fittings, appliances, equipment and processes. For cooling towers and evaporative condensers, the prerequisite also requires efficient drift eliminators that reduce drift to a maximum of 0.002% of recirculated water volume for counterflow towers and 0.005% of recirculated water flow for cross-flow towers. For more detailed information, you can refer to the web-based reference guide in the credit library atUSGBC's official website.

Explanation
According to the LEED v4: Building Design and Construction Guide, an integrated, whole-building approach is a process that requires collaboration and communication among all project team members and stakeholders throughout all phases of a project, from pre-design to occupancy and operations.The goal of this approach is to optimize the environmental and human health performance of a building as a whole, rather than focusing on individual components or systems1.
One of the benefits of an integrated, whole-building approach is that it allows the project team to identify and evaluate the interrelationships and trade-offs among various design strategies and decisions, and to optimize the synergies and minimize the conflicts among them1.For example, increasing the size of a glazed opening on the south facing wall may have implications for the daylighting, solar heat gain, thermal comfort, energy use, and mechanical system design of the building2.Therefore, the team members who are first affected by this change are the mechanical engineers, who are responsible for designing the heating, ventilation, and air conditioning (HVAC) system of the building, and ensuring that it meets the thermal comfort and energy performance requirements of the project3.The mechanical engineers may need to adjust the size, type, and location of the HVAC equipment, ductwork, and controls, as well as perform energy modeling and analysis to evaluate the impact of the change on the building's energy consumption and emissions3.The mechanical engineers may also need to coordinate with the architects, lighting designers, and other team members to ensure that the change does not compromise the other design goals and criteria of the project3.
References: LEED v4: Building Design + Construction Guide, Integrative Process, Introduction1; LEED v4:
Building Design + Construction Guide, Energy and Atmosphere Credit, Optimize Energy Performance, Requirements2; LEED v4: Building Design + Construction Guide, Indoor Environmental Quality Credit, Thermal Comfort, Requirements3