Pearl Building Rating System - Estidama

PW-4: Stormwater Management
Intent To minimize peak stormwater discharge and protect the stormwater drainage system
and receiving water bodies from pollutant loading during and after storm events.
Credit
Requirements
GENERAL
Quantity Control
� Demonstrate that the project has developed a stormwater management system
that prioritizes infiltration, sustainable urban drainage systems, and utilizes
structural solutions when necessary.
� 1 Credit Points: Demonstrate that the post-development peak runoff rate and
quantity from the 2-year 24-hour design storm does not exceed the predevelopment
peak run-off rate and quantity through structural methods, or a
combination of both structural and non-structural methods.
� 2 Credit Points: Demonstrate that the post-development peak runoff rate and
quantity from the 2-year 24-hour design storm does not exceed the predevelopment
peak run-off rate and quantity through the use of non-structural
methods only
Quality Control
� 1 Credit Point: The proposed stormwater management system is capable of
collecting and treating a minimum of 90% of stormwater and that the treatment
process is capable of achieving the following minimum standards for quality
control:
� 80% removal of Total Suspended Solids (TSS);
� Minimum 95% removal of litter (gross pollutants, >1mm);
� Minimum 90% removal of hydrocarbons; and
� Use of petrol interceptors or suitable permeable paving for car parks of more
than 4 bays
Operation & Maintenance Plan
� 1 Credit Point: Achieve a minimum of 1 credit point in either Quantity or Quality
Control; and
� Demonstrate that an Operation & Maintenance Plan (OMP) is in place that shows
how all systems will be maintained throughout the life of the development. The
plan should include at a minimum:
� Protocol for maintaining regular system checks and maintenance;
� Methods for ensuring neighboring developments will not be adversely affected
by the project’s stormwater strategy; and
� Strategies to prevent onsite erosion.
ADDITIONAL REQUIREMENT/CLARIFICATIONS
None
Pearl Building Rating System: Design & Construction, Version 1.0, April 2010 135 of 223