TITLE 17: CONSERVATION
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AUTHORITY: Implementing and authorized by Sections 23, 29a, 30 and 35 of the Rivers, Lakes and Streams Act [615 ILCS 5/23, 29a, 30 and 35].
SOURCE: Adopted at 17 Ill. Reg. 4484, effective March 23, 1993; emergency amendment at 18 Ill. Reg. 790, effective January 14, 1994, for a maximum of 150 days; amended at 18 Ill. Reg. 8167, effective May 16, 1994; recodified from 92 Ill. Adm. Code 700, Department of Transportation, to the Department of Natural Resources, at 22 Ill. Reg. 7362; amended at 27 Ill. Reg. 7774, effective April 21, 2003; amended at 29 Ill. Reg. 8316, effective May 26, 2005; amended at 34 Ill. Reg. 12875, effective August 20, 2010; amended at 38 Ill. Reg. 934, effective December 27, 2013; amended at 39 Ill. Reg. 1158, effective December 31, 2014.
Section 3700.10 Purpose
a) The purpose of this Part is to protect the rights, safety and welfare of private and public landowners by the regulation of floodway development. Construction activities which restrict a stream's capacity to carry flood flows may result in channel instability and increased flood damages to neighboring properties.
b) This Part applies to all rivers, lakes and streams under the Department's jurisdiction except those in the counties of Cook, Will, DuPage, Kane, Lake and McHenry for which floodway limits have been defined pursuant to 17 Ill. Adm. Code 3708.
c) Compliance with this Part does not excuse an applicant from complying with the following Department of Natural Resources, Office of Water Resources construction related rules:
1) Rules for Construction and Maintenance of Dams, 17 Ill. Adm. Code 3702. This Part is applicable statewide.
2) Regulation of Public Waters, 17 Ill. Adm. Code 3704. This Part applies to the entire State geographically but is limited to only those lakes, rivers, streams and waterways that are considered public waters.
d) Additionally, permits issued under this Part do not relieve the permittee of the responsibility of securing all other required authorizations.
Section 3700.20 Definitions
As used in this Part, the words and terms listed shall have the meanings ascribed to them as follows:
"Bridge or Culvert Reconstruction" − The total replacement of an existing bridge or culvert, including substructure and superstructure, on the existing road alignment or on an alignment within 100 feet upstream or downstream of the existing alignment in an urban area, or within 500 feet upstream or downstream of the existing alignment in a rural area.
"Construction" − The placement, erection or reconstruction of any building or structure, any filling or excavation, the installation of any utility, or the storage of any materials. Construction includes, but is not limited to, modifications to an existing building that would increase the building's outside dimensions, channel modifications and enclosures, roads, bridges, culverts, levees, bank protection, walls, fences, and any other man-made activity that would modify the physical features of a floodway with respect to the storage or conveyance of flood waters. Construction does not include normal maintenance and repair activities or farming operations such as discing and plowing.
"Department" − The Illinois Department of Natural Resources.
Floodplain – The land area adjacent to a stream or watercourse with ground surface elevations at or below the 1% annual chance of exceedence (100-year frequency) flood elevation.
"Floodway" The channel of a river, lake or stream and that portion of the floodplain that is needed to store and convey the 1% annual chance of exceedence flood discharge with no more than a 0.1 foot increase in stage due to the loss of flood conveyance and storage. Where floodways have been delineated for regulatory purposes, the mapped lines show the floodway encroachment limits and will be used. For other areas, the entire floodplain shall be considered to be in the floodway unless an analysis is approved by the Department demonstrating that a project site is outside of the floodway. The Department will review floodway delineation analyses provided by the applicants to verify that the resulting loss of flood conveyance and storage will result in no more than a 0.1 foot increase in stage. The Department will either approve or disapprove floodway delineation analyses and inform applicants of the reason for disapproval.
"Office of Water Resources" – The Office of Water Resources of the Illinois Department of Natural Resources.
"Permittee" − The entity issued a permit pursuant to this Part.
"Rural Areas" − All areas of the State not classified as urban areas.
"Urban Areas" − Areas of the State where residential, commercial or industrial development currently exists or, based on land use plans or controls, is expected to occur within 10 years after the application date. In determining urban areas, the Department will consider the expertise of local officials, regional and local planning commissions, city and county planners, or private development planners, as well as all available mapping. Areas with only isolated or widely scattered buildings will not be classified as urban areas.
"Worst-case Analysis" − The calculation of the maximum increases in flood heights, velocities and damages a project would cause due to conveyance and storage losses considering both the project alone and the combined effects of other existing construction and reasonably anticipated equally obstructive construction on other similarly situated properties in the locality. Flood events up to and including the flood which has a 1% annual chance of exceedence shall be used in this analysis (see Section 3700.75 for exception).
(Source: Amended at 38 Ill. Reg. 934, effective December 27, 2013)