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Storm Detention Requirements Frequently Asked Questions (May 16, 2025)
Frequently asked questions about changes to the storm detention requirements in Chapter 9 of the Infrastructure Design Manual (IDM).
Last updated: May 16, 2025
Storm Water Detention Examples
These example calculations of storm detention are based on Chapter 9 detention criteria in the Infrastructure Design Manual (IDM), effective March 31, 2021, and related governing documents.
• Outside of these examples, the IDM shall govern.
Updated 12-11-2023
02082-10 Standard LDWL Access Manhole Details
02082-10 Standard LDWL Access Manhole Details
TIA Approval Package
00102 Prebid Project Information Form
00609 List Of Non Diesel Equipment
02317-09 Standard LDWL Excavation and Backfill Detail
2021 Detail for 02317-09 Standard LDWL Excavation and Backfill Detail (effective October 1, 2021)
Last updated: July 6, 2021
Standard Construction Specifications Redlines from 2020-2021 Review Cycle