FLOOD06610

• County: Statewide
• Basin: Statewide
• Title: Regulation Number 61 Colorado Discharge Permit System Regulations
• Date: 4/30/1999
• Prepared For: State of Colorado
• Prepared By: Water Quality Control Commission
• Floodplain - Doc Type: Educational/Technical/Reference Information

(45) "MEDIUM MUNICIPAL SEPARATE STORM SEWER SYSTEM" means all municipal
separate storm sewers that are either:

(a) located in the City of Aurora, City of Lakewood, or the City of Colorado Springs; or

(b) located in a municipality other than that described in (a) and meets the criteria of
either (b) (i) or (b)(ii) below:

(i) in an incorporated place, other than that described in (a), with a population of
100,000 or more but less than 250,000, as determined by the 1990 Decennial Census by the
Bureau of Census; or

(ii) in the unincorporated portions of a county that has areas designated as
urbanized areas by the 1990 Decennial Census by the Bureau of Census and where the
population of the urbanized areas exceeds 100,000 but less than 250,000, after the population
in the incorporated places with in the urbanized areas is excluded, except municipal separate
storm sewer systems that are located in the incorporated places within such counties;

(c) owned or operated by a municipality other than those described in paragraphs (a) or
(b) and that are designated by the Division as part of the large or medium municipal separate
storm sewer system due to the interrelationship between the discharges of the designated
storm sewer and the discharges from municipal separate storm sewers described under
paragraphs (a) or (b). In making this determination the Division may consider the following
factors:

(i) physical interconnections between the municipal separate storm sewers;

(ii) the location of discharges from the designated municipal separate storm sewer
relative to discharges from municipal separate storm sewers described in subparagraph (a);

(iii) the quantity and nature of pollutants discharged to state waters;

(iv) the nature of the receiving waters; or

(v) other relevant factors; or

,

(d) the Division may, upon petition, designate as a medium municipal separate storm
sewer system, municipal separate storm sewers located within the boundaries of a region
defined by a stormwater management regional authority based on a jurisdictional, watershed, or
other appropriate basis that includes one or more of the systems described in paragraphs (a),
(b) or (c).

.

(46) "MUNICIPAL SEPARATE STORM SEWER" means a conveyance or system of
conveyances (including roads with drainage systems, municipal streets, catch basins, curbs,
gutters, ditches, man-made channels, or storm drains):

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