Green buildings and Griha norms giving information related to how much water can be saved and the points allocated by Griha for satisfying water related norms.

1. BY
R.DILLI BABU
S.R.SAKTHIVEL

2. WHY AUDIT BUILDINGS ?
 Establishes building baseline
 Defines capital expenditures
 Incentives potential
 Marketing to potential tenants
 Anticipates legislation and regulation

3. ASSESMENT
 Building Walk-through
 Energy Star Benchmarking
 Environmental Comfort Analysis
 Gap Analysis-Building Benchmark
 Baseline to IGBC
 Comprehensive Report with Cost Analysis

4. GRIHA NORMS
Residential Buildings
Commercial Buildings

5. CALCULATIONS
 Methodology for
calculating water
consumption and water
use reduction,
Water consumption =
N×FR×U
• N = Total occupants
• FR = Flow rate of each type
of fixtures
• U = Number of uses of each
type of fixtures fixed
 Water use reduction (%) =
 {(A–B) /A }× 100
 A = Annual building water
consumption through
water fixture- Base case
(liters/year)
 B = Annual building water
consumption through
water fixture- Existing case
(liters/ year) Non

6. Calculations Cont
 Landscape water requirement
(lpd)= (Plant factor
× Evapotranspiration rate
(mpd) × Canopy area (sq.m))
Irrigation system efficiency ×
1000
 Plant factor refers to water
requirement of the plants.
 Evapotranspiration rate refers
to the amount of water
required by the plant for
healthy growth and
determines the rate at which
the plant loses water through
evaporation.
 Landscape water use
reduction (%) = (A–B) /A ×
100
 A = Annual landscape water
demand of base case
 B = Annual landscape water
demand of existing case

7. Calculations Cont
 Cumulative water
performance
 {Annual water demand of
the municipal or ground
water /Annual water
demand of the project } ×
100
 Annual ground water
demand (liters/year)=
(Annual water demand of
the project) – (Annual
water recycled & reused)
 Annual water demand
liters/year of the project
includes the water
requirement are
 Planned and floating
population.
 Landscape
 Services like HVAC, fire-
fighting,

8. WATER FOOTPRINT
 Minimizing lawn area and restricting it to 25% of the
total landscaped area. – 2 points
 Use of water-efficient irrigation systems to reduce the
water requirement by at least 50% from the GRIHA
base case. – 2 points
 Reduction in building water consumption by 30%
below the base case through water efficient fixtures. –
3 points

9. REDUCTION IN CUMULATIVE
WATER PERFORMANCE
 Cumulative water performance (WP) reduces to 20%
of total water use. – 2 points
 Cumulative WP reduces to 30% of total water use. – 3
points
 Cumulative WP reduces to 50% of total
water use. – 6 points
 Cumulative WP reduces to 70% of total water use. –
10 points

10. CONSERVATION EFFECTS