Utilizing Peak Water Demand Calculator benefits developers, builders and residents.

CPC Appendix M or the Water Demand Calculator (WDC) provides a
method for estimating the demand load for the building water supply,
principal branches, and risers for single family and multifamily dwellings.

The peak water demands derived using CPC Appendix M inform the
recommended diameter of water supply pipes. The alternative approach of
using CPC Appendix M methodology in conjunction with CPC Appendix A
or pipe sizing yields lower design flow rates and smaller distribution piping
when compared to using only CPC Appendix A.

Construction cost savings to builders from:

• Smaller diameter pipes and fittings, valves, pumps, and other equipment
• Smaller inside diameter pipe insulation
• Smaller water service entrance size, resulting in smaller water meter size with lower connection fees.

• Water savings from faster hot water delivery, resulting in smaller monthly water service charges and lower associated volumetric sewer charges
• Energy savings due to decreased heat loss in the hot water distribution system.
• Faster delivery of hot water to occupants.
• Reduced public health and safety risk and improved water quality due to shorter water dwell times within plumbing systems.
• Reduced carbon emissions due to material savings and energy reductions.