Page 148 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

128 Cha pte r T h ree

Gallons Generated per Gallons Generated
Use [Gallons per Flush per Minute (gpm)
or Cycle (gpf)] (WCR, (LFR, KSR, PRR
i i i i
Specific Fixture Type LCF i or UR i ) or SR i )
Baseline water closet (commercial and 1.6 n/a
residential)
Baseline urinal 1.0 n/a
Baseline commercial lavatory faucet (not 0.25 metered 0.5 not metered
private applications)
Baseline commercial lavatory faucet n/a 2.2
(private applications such as hotel rooms)
Baseline residential lavatory faucet n/a 2.2
(Baseline Commercial lavatory faucet (n/a) (2.5)
LEED 2.2)
Baseline prerinse spray valves n/a 1.6
Baseline kitchen sink n/a 2.5
Low-flow kitchen sink n/a 1.8
Baseline shower n/a 2.5
Low-flow shower n/a 1.8

∗ The project team may add other fixture types to this list as applicable. See Table 3.2.2 for typical water closet
2
and urinal options. LEED 2009 also allows for additional showerhead flows for shower areas >2500 in and
provides a listing of EPA Watersense options for design including 1.28 gpf WC, 1.5–2 gpm showerheads, and
1.5 gpm private lavatory fixtures.
TABLE 3.3.2 Baseline Flow Rates by Fixture Type and Some Typical Low-flow Kitchen and Shower Rates ∗

or
IWUB = (1.6 × TWCU) + (1.0 × TUU) + [0.25 × TLFU]
auto
+ [2.2(0.25 min) × TKSU] + [2.5(5 min) × TSU] + [1.6 (? min)
× TPRU] for lavatory faucets with autocontrols (metered),
in gallons per year, no private applications (3.3.5)
To calculate the applicable design indoor water usage (IWUD), the factors in Eqs. (3.3.4)
and (3.3.5) are replaced with those appropriate for the alternate fixture type i used such
as LFR , KSR , and SR from the design (see Table 3.3.2 for some typical values). Note
i i i
that the prerinse spray rates and the metered lavatory faucet volumes have not been
modified and will need to be reduced in these equations if the design values are lower.

IWUD = (WCR × TWCU) + (UR × TUU) + [LFR (0.25 min) × TLFU]
no-auto i i i
+ [KSR (0.25 min) × TKSU] + [SR (5 min) × TSU] + [1.6 (? min)
i i
× TPRU] for lavatory faucets without autocontrols, in gallons
per year, no private applications (3.3.6)