Page 97 - GRIHA Manual Volume I - Introduction to National Rating System
P. 97
84 Griha Manual: Volume 1
Criterion 21 Water recycle and reuse (including rainwater)
Objective
To utilize the treated waste water and rainwater for various applications (including groundwater
recharge) where potable municipal water is normally used, to reduce the load on both the municipal
supplies as well as the sewerage system and to improve the groundwater level.
21.1 Commitment
21.1.1 Provide necessary treatment of wastewater for achieving the desired composition for
various applications.
21.1.2 Implement rainwater harvesting and storage systems depending on the site-specifi c
conditions. All necessary steps to prevent possible contamination of ground water by
rainwater harvesting should be taken (design requirements as per Central Ground Water
Board). This is a mandatory requirement.
21.1.3 Reuse the treated wastewater and rainwater for meeting the building water and irrigation
demand.
21.1.4 Recharge the surplus water (after reuse) into the aquifer.
21.2 Compliance
The following documents are to be submitted.
21.2.1 Narrative along with drawings and specifi cations of the type of treatment and harvesting
system being employed.
21.2.2 Drawings indicating the specifi cations of dual plumbing system.
21.2.3 Documents indicating the projected quality of water, as per specifi cations.
21.2.4 Drawings with specifi cations of the systems, along with delivery lines, indicating the
capacity of water treated and harvested.
21.2.5 Calculation sheet representing the total quantity of water treated and harvested and the
amount being used for diff erent applications including use within the building, landscape,
and fraction recharged into ground.
21.2.6 Details of fi ltration system to show that adequate preventative measures are being taken to
avoid contamination of aquifer by the recharged rainwater (mandatory if applicable).
21.3 Appraisal (maximum points – 5)
21.3.1 Annual water reuse of 25%, as per clause 21.2.5 (1 point).
21.3.2 Annual water reuse of 50%, as per clause 21.2.5 (1 point).
21.3.3 Annual water reuse of 75%, as per clause 21.2.5 (1 point).
21.3.4 Recharge of surplus rainwater into aquifer (2 points).
Non applicability condition: For sites that have high water table where recharge is not
advisable as per CGWB norms, 2 points related to ground water recharge shall not be
applicable to sites in which recharge is not feasible and the points related to reuse does not
apply to projects which do not qualify for criterion 20.
Criterion 21 Water recycle and reuse (including rainwater)
Objective
To utilize the treated waste water and rainwater for various applications (including groundwater
recharge) where potable municipal water is normally used, to reduce the load on both the municipal
supplies as well as the sewerage system and to improve the groundwater level.
21.1 Commitment
21.1.1 Provide necessary treatment of wastewater for achieving the desired composition for
various applications.
21.1.2 Implement rainwater harvesting and storage systems depending on the site-specifi c
conditions. All necessary steps to prevent possible contamination of ground water by
rainwater harvesting should be taken (design requirements as per Central Ground Water
Board). This is a mandatory requirement.
21.1.3 Reuse the treated wastewater and rainwater for meeting the building water and irrigation
demand.
21.1.4 Recharge the surplus water (after reuse) into the aquifer.
21.2 Compliance
The following documents are to be submitted.
21.2.1 Narrative along with drawings and specifi cations of the type of treatment and harvesting
system being employed.
21.2.2 Drawings indicating the specifi cations of dual plumbing system.
21.2.3 Documents indicating the projected quality of water, as per specifi cations.
21.2.4 Drawings with specifi cations of the systems, along with delivery lines, indicating the
capacity of water treated and harvested.
21.2.5 Calculation sheet representing the total quantity of water treated and harvested and the
amount being used for diff erent applications including use within the building, landscape,
and fraction recharged into ground.
21.2.6 Details of fi ltration system to show that adequate preventative measures are being taken to
avoid contamination of aquifer by the recharged rainwater (mandatory if applicable).
21.3 Appraisal (maximum points – 5)
21.3.1 Annual water reuse of 25%, as per clause 21.2.5 (1 point).
21.3.2 Annual water reuse of 50%, as per clause 21.2.5 (1 point).
21.3.3 Annual water reuse of 75%, as per clause 21.2.5 (1 point).
21.3.4 Recharge of surplus rainwater into aquifer (2 points).
Non applicability condition: For sites that have high water table where recharge is not
advisable as per CGWB norms, 2 points related to ground water recharge shall not be
applicable to sites in which recharge is not feasible and the points related to reuse does not
apply to projects which do not qualify for criterion 20.
