Overview
This course is intended to present recommended design procedures and guidelines for use in complying with the requirements of Section 1-303.03 Stormwater Storage.
The main purpose of a detention basin is to store excess runoff thus reducing peak discharges downstream. Detention basins should be considered when increased runoff due to highway activities would cause additional damage to downstream property or would worsen flooding conditions. The cost of a detention basin should be compared to other methods of mitigation, such as downstream channel improvements or purchasing flood easements, to determine the most feasible solution.
A detention facility should be designed to project an image acceptable to the public. Multiple use of detention facilities is also a major means of gaining public acceptance for the stormwater management facility. Because an area used for detention of runoff may have other uses; the size, shape and slopes of the detention facility should be compatible with such auxiliary uses of the facility. In addition, the allowable depth of water for the design discharge and the length of time that stored water remains in the facility should also be compatible with other uses of the facility.
In this course, the student will review Chapter 12 of the Illinois Department of Transportation Drainage Manual. This course is relevant to municipal engineers, highway engineers, and consulting engineers serving private developers.
The student must take a multiple-choice quiz consisting of thirty (30) questions at the end of this course to obtain PDH credit.
Specific Knowledge or Skill Obtained
This course teaches the following specific knowledge and skills:
- General considerations for detention storage
- General Design Procedures
- Outlet Structure Hydraulics
- Flood Routing Techniques
- Detention Storage Routing
- Linear Stormwater Detention
- Example Problems
Course
Click on the following link to the PDF document to review the course material before taking the quiz for credit.
Stormwater Detention Document 1
Stormwater Detention Document 2
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