# 17 Ill. Adm. Code 37100.3710.20: Section 3710.20 Development Standards

> Illinois · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_20

## Section

- **Citation:** 17 Ill. Adm. Code 37100.3710.20
- **Heading:** Section 3710.20 Development Standards
- **Jurisdiction:** Illinois
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Illinois Administrative Code / Title 17  /  / Part 37100  / Section 3710.20 Development Standards

## Text

TITLE: 17: CONSERVATION
CHAPTER I: DEPARTMENT OF NATURAL RESOURCES
SUBCHAPTER h: WATER RESOURCES
PART 3710 FLOODPLAIN DEVELOPMENT REQUIREMENTS FOR STATE OWNED PROPERTIES
SECTION 3710.20 DEVELOPMENT STANDARDS
Section 3710.20  Development Standards
All State development activity must first comply with and
obtain required permits pursuant to 17 Ill. Adm. Code 3700, 3704, and 3708.
After compliance with 17 Ill. Adm. Code 3700, 3704, and 3708, all development
activity located in a floodplain, which includes both floodway and flood
fringe, shall comply with all requirements of 44 CFR 60 as effective on January
1, 2025 and does not include any later editions or amendments. This Part
applies to State development on both new and existing construction. The
following are additional standards to the requirements of 44 CFR 60 that all State
development activity must also comply with:
a)         All
new, substantially improved, or substantially damaged structures must have the
lowest floor, including basements, at or above the flood protection elevation.
b)         Critical
facilities that are new, substantially improved, or substantially damaged must
have the lowest floor, including basements, elevated or structurally dry
floodproofed to the 0.2% annual chance flood elevation when delineated on the
FIRM or three feet above the BFE, whichever is greater.  Adequate parking shall
be provided for staffing of the critical facilities at or above the BFE or 0.2%
chance flood when delineated on the FIRM, when defined.
c)         For
all projects involving channel modification, fill, or stream maintenance
(including levees), the flood carrying capacity of the watercourse shall be
maintained. In addition, the State agency performing the development activity
shall notify communities, that are both adjacent to the impacted watercourse
and adjacent to the project, in writing thirty days prior to applying for a
permit for the alteration or relocation of the watercourse
, fill, or stream maintenance
(including levees), the flood carrying capacity of the watercourse shall be
maintained. In addition, the State agency performing the development activity
shall notify communities, that are both adjacent to the impacted watercourse
and adjacent to the project, in writing thirty days prior to applying for a
permit for the alteration or relocation of the watercourse. A copy of this
notification shall be included with the permit application.
d)         If
the proposed development activity modifies the FIRM, then the agency that is
applying for the permit is responsible for submitting an application to FEMA
for a formal determination to change the map. This process is done through the
Letter of Map Change request and includes Letter of Map Amendment, Letter of
Map Revision, and the Conditional Letter of Map revision.

## Nearby sections

- [17 Ill. Adm. Code 37100.3710.10 Section 3710.10  Purpose](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_10.md)
- [17 Ill. Adm. Code 37100.3710.15 Section 3710.15  Definitions](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_15.md)
- [17 Ill. Adm. Code 37100.3710.20 Section 3710.20  Development Standards](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_20.md)
- [17 Ill. Adm. Code 37100.3710.25 Section 3710.25  Application](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_25.md)
- [17 Ill. Adm. Code 37100.3710.30 Section 3710.30  Requirements to Obtain and Contents of a Development Permit](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_30.md)
- [17 Ill. Adm. Code 37100.3710.35 Section 3710.35  Variances](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_35.md)
- [17 Ill. Adm. Code 37100.3710.40 Section 3710.40  Reports and Certification](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_40.md)
- [17 Ill. Adm. Code 37100.3710.45 Section 3710.45  Suspension of Permit](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_45.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P37100_S3710_20. Check the current official text before relying on it. Not legal advice.