Water Balance Approach for Buildings
Definition
A water balance approach maps site supply, end uses, losses, wastewater, and rainwater so demand can be reduced first and remaining nonpotable demands can be matched to suitable alternative supplies.
Sourced Facts
- The guide recommends assessing existing water resources, demand-reduction opportunities, and alternative supplies through an integrative process. PDF p. 68; guide p. 61
- It describes an efficiency-first sequence: reduce total and potable-water demand before considering nonpotable or alternative supplies. PDF p. 69; guide p. 62
- A water end-use profile helps identify major uses and evaluate strategies; submetering can track trends, fixture performance, and leaks. PDF p. 69; guide p. 62 PDF p. 70; guide p. 63
- Rainwater, graywater, or reclaimed water may serve suitable nonpotable uses where regulations permit. PDF p. 69; guide p. 62 PDF p. 70; guide p. 63
Interpretation
Interpretation
Build the water model by end use, not by a single whole-building total. Sequence measures as avoid demand, improve efficiency, substitute fit-for-purpose water, meter, and correct. Verify local health and plumbing rules before assuming an alternative source is permissible.
Evidence
- Primary pages: PDF p. 68; guide p. 61, PDF p. 69; guide p. 62, and PDF p. 70; guide p. 63
- Source note: LEED Core Concepts Guide - Third Edition > Water Efficiency