UFC 3-210-10
25 October 2004
Budget constraints often limit construction funding to that necessary for
conveyance or flood control requirements. The limited framework may create situations
where regulatory requirements are met but the design results in degradation of the
natural resources. LID principles use hydrology as the integrating framework of design,
and protect the overall ecology of the watershed. LID allows facilities to meet the
regulatory requirement for flood control (by storing and infiltrating a sufficient volume)
while sufficiently filtering targeted pollutants through natural and man-made systems.
5-3
FUNDAMENTAL SITE PLANNING CONCEPTS. The goal of LID site
planning is to allow for full development and function of the intended site activity while
maintaining the site's essential natural or existing hydrologic function. The LID site
Hydrology is the Integrating Framework for the Design
Distribute Controls through Micromanagement
Stormwater is Controlled at the Source
Utilize Non-structural Systems Where Possible
Create Multifunctional Landscape, Buildings and Infrastructures
5-3.1
Hydrology is the Integrating Framework for the Design. LID designs have
the goal of mimicking the natural site drainage processes and functions. Techniques
are used to modify hydrologic processes, such as infiltration or storage, to meet the
specific water quality, water quantity, and natural resource objectives. LID designs
create an effective drainage process for stormwater on the site. A stormwater
management system will come closest to mimicking natural flow patterns when storage
and infiltration components are distributed across the site.
5-3.2
Distribute Controls Through Micromanagement. In order to emulate
natural processes, it is imperative to view the site as a series of interconnected small-
scale design controls. Such a structure creates opportunities for redundancy in
treatment and control, the development of a "treatment train" for water quality control,
and the opportunity to strategically locate LID components.
5-3.3
Stormwater is Controlled at the Source. Controlling and treating runoff as
it is being generated reduces or eliminates the risks associated with transporting
pollutants further downstream through pipes and channels. Management of stormwater
at the source is especially valuable if remediation is required, such as in the case of an
accidental spill of pollutants, because the problem can be easily isolated or the
treatment system adjusted.
5-3.4
Incorporate Non-Structural Systems. LID designs recognize the potential
of natural systems to intercept and filter pollutants. Phytoremediation techniques that
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PGDER, 2000a.
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