| Tips for Effective Ordering |
Our service is to search for a copy of the applicable hydraulic model run.
See Scope of the ISWS Floodplain Model Service for additional details.
Before You Request Model Data:
- Visit the community's local floodplain map repository:
- to determine the FEMA maps that you need, and
- to search for any FEMA Letters of Map Revision (LOMRs) that may affect your area of interest.
- Determine an appropriate reach of interest, identifying specific landmarks (or FIS cross-sections).
- Order the effective FIRM(s) and FIS (and Floodway panels, if the FIRM is dated prior to 1988) from FEMA.
- Find all the applicable text in Sections 3 & 4 of the FIS text describing the methods used to map your reach. (Also check for added revision sections in the back of the text.)
When to Request Data from ISWS:
- You just need the hydraulic model.
- You have not been able to obtain the corresponding model from another source (including FEMA).
When to Request Data from a Source Other than the ISWS:
- You need more of the study documentation than just the computer runs.
- You need the topographic work maps used to map the FIRM.
- The subject floodplain is a ponding area.
- Any of the subject reach is covered by a LOMR that is still in effect.
- Permitted modifications other than your project are occurring or have occurred recently in the subject reach.
| Other Sources for Model Data |
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FEMA’s Map Coordination
Contractor and repository: PBS&J, (800) 697-7275 x406, or mapspecialist@pbsj.com |
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The village, city, or county engineer (staff or
consultant); or stormwater management commission staff |
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The study contractor who performed the currently
effective flood study (identify by thoroughly reading FIS Sections 1.2, 3.1, and 3.2, and any revision sections). |
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Illinois Department of Natural Resources (IDNR) Office of Water
Resources engineering staff |