Page 208 - Solar Power in Building Design The Engineer's Complete Design Resource

178 LEED—LEADERSHIP IN ENERGY AND ENVIRONMENTAL DESIGN

Storm water management, credit no. 6 The objective of this measure involves
preventing the disruption of natural water flows by reducing storm water runoffs and
promoting on-site water filtration that reduces contamination.
Essentially these requirements are subdivided into two categories. The first one
deals with the reduction of the net rate and quantity of storm water runoff that is
caused by the imperviousness of the ground, and the second relates to measures under-
taken to remove up to 80 percent of the average annual suspended solids associated
with the runoff.
Design mitigation measures include maintenance of natural storm water flows that
include filtration to reduce sedimentation. Another technique used is construction of
roof gardens that minimize surface imperviousness and allow for storage and reuse of
storm water for nonpotable uses such as landscape irrigation and toilet and urinal
flushing.
The point weight granted for each of the two categories discussed here is 1.

Heat island effect, credit no. 7 The intent of this requirement is to reduce the
microclimatic thermal gradient difference between the project being developed and
adjacent lands that have wildlife habitats. Design measures to be undertaken include
shading provisions on site surfaces such as parking lots, plazas, and walkways. It is
also recommended that site or building colors have a reflectance of at least 0.3 and that
50 percent of parking spaces be of the underground type.
Another design measure suggests use of Energy Star high-reflectance and high-
emissivity roofing. To meet these requirements the project site must feature extensive
landscaping. In addition to minimizing building footprints, it is also suggested that
building rooftops have vegetated surfaces and that gardens and paved surfaces be of
light-colored materials to reduce heat absorption.
The point weight granted for each of the two categories discussed here is 1.

Light pollution reduction, credit no. 8 Essentially, this requirement is intended
to eliminate light trespass from the project site, minimize the so-called night sky
access, and reduce the impact on nocturnal environments. This requirement becomes
mandatory for projects that are within the vicinity of observatories.
To comply with these requirements, site lighting design must adhere to Illumination
Engineering Society of North America (IESNA) requirements. In California, indoor
and outdoor lighting design should comply with California Energy Commission
(CEC) Title 24, 2005, requirements. Design measures to be undertaken involve the use
of luminaires and lamp standards equipped with filtering baffles and low-angle spot-
lights that could prevent off-site horizontal and upward light spillage.
The point weight granted for this measure is 1.

WATER EFFICIENCY MEASURES

Water-efficient landscaping, credit no. 1 Basically, this measure is intended
to minimize the use of potable water for landscape irrigation purposes.