[Code of Federal Regulations]
[Title 33, Volume 3]
[Revised as of July 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 33CFR238.4]

[Page 317-318]
 
                TITLE 33--NAVIGATION AND NAVIGABLE WATERS
 
         CHAPTER II--CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY
 
PART 238--WATER RESOURCES POLICIES AND AUTHORITIES: FLOOD DAMAGE REDUCTION MEASURES IN URBAN AREAS--Table of Contents
 
Sec. 238.4  Definitions.

    For purposes of this regulation the following definitions apply:
    (a) Urban areas are cities, towns, or other incorporated or 
unincorporated political subdivisions of States that:
    (1) Provide general local government for specific population 
concentrations, and,
    (2) Occupy an essentially continuous area of developed land, 
containing such structures as residences, public and commercial 
buildings, and industrial sites.
    (b) Flood damage reduction works in urban areas are the adjustments 
in land use and the facilities (structural and non-structural) designed 
to reduce flood damages in urban areas from overflow or backwater due to 
major storms and snowmelt. They include structural and other engineering 
modifications to natural streams or to previously modified natural 
waterways. Flood damage reduction works are designed to modify flood 
behavior typified by temporary conditions of inundation of normally dry 
land from the

[[Page 318]]

overflow of rivers and streams or from abnormally high coastal waters 
due to sever storms.
    (c) Storm sewer systems are the facilities in urban areas designed 
to collect and convey runoff from rainfall or snowmelt in the urban area 
to natural water courses or to previously modified natural waterways. 
They include storm drains, inlets, manholes, pipes, culverts, conduits, 
sewers and sewer appurtenances, on-site storage and detention basins, 
curbs and gutters, and other small drainageways that remove or help to 
manage runoff in urban areas. Storm sewer systems are designed to solve 
storm drainage problems, which are typified by excessive accumulation of 
runoff in depressions; overland sheet flow resulting from rapid snowmelt 
or rainfall; and excessive accumulation of water at the facilities 
listed in this paragraph because of their limited capacity.