1 January 2005
with change 25 October 2006
GeneRAL DesIGn COnsIDeRAtIOns
The purpose of this Chapter is to provide the Design Agency with general
information and direction on the systems and materials applicable to all USAR facilities,
on the design of the site, and on the design of the various buildings. The Chapter
includes some "lessons learned" by Corps of Engineers and private-sector A/E teams
on previous USAR projects.
The considerations in this Chapter are those which affect the site and
landscaping, or an entire facility or building; for information on individual spaces, see
Chapter 4. USAR building system and material preferences are also reviewed and
discussed in this Chapter.
CIVIL AnD UtILItIes
Grading and Drainage
3-220.127.116.11 Sites should be developed for positive drainage away from all building areas.
Site drainage should be accomplished by sheet drainage, preferably over turf areas or
other means of erosion control, especially adjacent to foundations. Use of onsite ditches
and channels for conveyance of surface water will be minimized. Extremely flat sites on
which it is not practical to establish sufficient elevation differences for overland drainage
may require use of localized storm sewers and catch basins to convey storm water flow.
3-18.104.22.168 In general, all sites now require detention/retention of
storm water to meet the standards of local or state water
resources agencies responsible for regulation of surface water
discharges; designs will comply with local requirements for
release of storm water from the site. Government installations
with a public works department may have adopted installation
specific drainage requirements.
Storm Water Quality and Control
3-22.214.171.124 The storm water runoff rate from the site should typically be held to its
predeveloped rate, utilizing on-site detention or retention facilities. Surface ponds or
depressions should be developed which are capable of storing, by detention or
retention, the required amount of water.
3-126.96.36.199 If the site to be developed has been acquired on the commercial market and
is part of a larger overall development scheme, it may be part of a regional ponding