Page 76 - GRIHA Manual Volume I - Introduction to National Rating System
P. 76
Criteria for GRIHA rating 63
Criterion 5 Reduce hard paving on-site and/or provide
shaded hard-paved surfaces
Objective
To reduce hard paving on-site (open areas surrounding building premises) and/or provide shade on
hard-paved surfaces to minimize the heat island eff ect and imperviousness of the site.
5.1 Commitments
5.1.1 Net paved area of the site under parking, roads, paths, or any other use not to exceed 25%
of the site area or net imperviousness of the site not to exceed the imperviousness factor as
prescribed by the National Building Code of India, Bureau of Indian Standards, 2005; Part 9
(Plumbing services) Section 5.5.11.2.1, whichever is more stringent.
5.1.2 Total surface parking not to exceed the area as permissible under the local bylaw and
# more than 50% of the total paved area to have pervious paving/open grid pavement/
grass pavers, or
# a minimum 50% of the total paved area (including parking) to have shading by vegetated
roof/pergola with planters, or
# a minimum 50% of the total paved area (including parking) to be topped with fi nish
having solar refl ectance of 0.5 or higher.
Combination
Minimum 50% of total paved area to have any combination of above mentioned strategies for
pervious paving shaded paved area or area with SRI (solar refl ectance index) > 50% where common
area having 2 or more strategies shall be calculated only once.
5.2 Compliance
The following may be submitted.
5.2.1 Calculations to support design commitment, as per following equations (1–6)
Net impervious area on ground (sq. m.)
Net paved area (%) = x 100 equation (1)
Total site area minus building footprint (sq. m.)
Impervious paved area on-site to include parking, driveways, sidewalks, roads, boundary wall, often
plazas walkways, etc. Exclude areas that have pervious paving (grass pavers, open grid pavements,
gravel paving, etc.) Total site area is an area of plot used for calculation of fl oor area ratio/fl oor space
index.
2
Net imperviousness of site (m ) = Surface area × Runoff coeffi cient equation (2)
(from table 5.1)
2
Net imperviousness of site as per equation 2(m )
Imperviousness (%) = x 100 equation (3)
2
Total site area(m )
(Pervious paving+paving with vegetated roof/shading+paving with high SRI ) > 50%
equation (4)
Total Paved area
Criterion 5 Reduce hard paving on-site and/or provide
shaded hard-paved surfaces
Objective
To reduce hard paving on-site (open areas surrounding building premises) and/or provide shade on
hard-paved surfaces to minimize the heat island eff ect and imperviousness of the site.
5.1 Commitments
5.1.1 Net paved area of the site under parking, roads, paths, or any other use not to exceed 25%
of the site area or net imperviousness of the site not to exceed the imperviousness factor as
prescribed by the National Building Code of India, Bureau of Indian Standards, 2005; Part 9
(Plumbing services) Section 5.5.11.2.1, whichever is more stringent.
5.1.2 Total surface parking not to exceed the area as permissible under the local bylaw and
# more than 50% of the total paved area to have pervious paving/open grid pavement/
grass pavers, or
# a minimum 50% of the total paved area (including parking) to have shading by vegetated
roof/pergola with planters, or
# a minimum 50% of the total paved area (including parking) to be topped with fi nish
having solar refl ectance of 0.5 or higher.
Combination
Minimum 50% of total paved area to have any combination of above mentioned strategies for
pervious paving shaded paved area or area with SRI (solar refl ectance index) > 50% where common
area having 2 or more strategies shall be calculated only once.
5.2 Compliance
The following may be submitted.
5.2.1 Calculations to support design commitment, as per following equations (1–6)
Net impervious area on ground (sq. m.)
Net paved area (%) = x 100 equation (1)
Total site area minus building footprint (sq. m.)
Impervious paved area on-site to include parking, driveways, sidewalks, roads, boundary wall, often
plazas walkways, etc. Exclude areas that have pervious paving (grass pavers, open grid pavements,
gravel paving, etc.) Total site area is an area of plot used for calculation of fl oor area ratio/fl oor space
index.
2
Net imperviousness of site (m ) = Surface area × Runoff coeffi cient equation (2)
(from table 5.1)
2
Net imperviousness of site as per equation 2(m )
Imperviousness (%) = x 100 equation (3)
2
Total site area(m )
(Pervious paving+paving with vegetated roof/shading+paving with high SRI ) > 50%
equation (4)
Total Paved area
