Stormwater System Maintenance
Storm Drain System Mapping and Illicit Discharge Detection
Elimination (IDDE) references
The following information is provided to assist you in complying with the mapping and Illicit
Discharge Detection and Elimination (IDDE) components of the Phase II program.
Please note that RIDEM is currently working on an asset management system that will allow
tracking of BMPs, outfalls and other stormwater assets. At this time they are reviewing
potential database management systems. It is anticipated that a program will be available for
use in the next 2 years at low to no cost to municipalities. If you chose to begin working
with a data management system now; several database systems have been included in this
document, for your review. There are many other databases available. URI is currently
looking to RIDEM to provide a list of requested data that will allow migration from any
municipal database that contains the requested data to the new RIDEM system.
Regulations:
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Mapping and IDDE requirements are found in the “General Permit, Rhode Island
Discharge from Small Municipal Separate Storm Sewer Systems and from Industrial
Activity at Eligible Facilities Operated by Regulated Small MS4s” located on the
RIPDES Stormwater Page:
http://www.dem.ri.gov/programs/benviron/water/permits/ripdes/stwater/index.htm
Also, check your municipal Stormwater Pollution Prevention Plan (SWPPP) for
additional specific information on requirements.
Resources:
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Introduction to GPS for Stormwater Managers workshop; Instructions on how to map
and record stormwater outfall location using GPS units; link photographic records of
outfalls with GPS data; overview of mapping requirements under Rhode Island Phase
II program; spreadsheet for reporting collected information to RIDEM and Illicit
Discharge Detection and Elimination (IDDE) survey forms.
http://geospatial.uri.edu/answers/default.html (scroll down to the titles under “Living
in the Past?”
Illicit Discharge Detection and Elimination Guidance Manual from the Center for
Watershed Protection: http://www.cwp.org/idde_verify.htm
EPA website with many useful links to additional guidance on IDDE:
http://cfpub.epa.gov/npdes/stormwater/idde.cfm There is also an access database and
field reporting form for outfall inventory data on this site.
Module 3: Typical Roadway Drainage
Mapping and IDDE references
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Stormwater System Maintenance
Databases:
□ RIDOT access database for keeping track of outfalls and BMP maintenance is located
on the training CD. Including forms for use in the field to record inspections of
BMPs. Includes ability to link photographs into data record.
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Operator Assisted Sewer Information System (OASIS); http://www.sewers.com/ This
access database also keeps track of stormwater systems information. There is a free
trial version, but the full version costs approx. $4000. There is also a user manual.
EPA IDDE access database; http://cfpub.epa.gov/npdes/stormwater/idde.cfm This
access database includes a field reporting form for outfall inventory data.
Module 3: Typical Roadway Drainage
Mapping and IDDE references
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