The document provides an overview of sustainable stormwater management and low impact development (LID). It discusses the importance of effective stormwater management given finite freshwater resources. It describes the paradigm shift from conventional stormwater approaches to LID, which aims to maintain pre-development hydrologic functions through decentralized small-scale controls like bioretention and permeable pavements. LID can provide multiple benefits including reduced infrastructure costs, improved water quality and more.
1. Overview of Sustainable Stormwater Management/Low Impact Development Presented by Sandeep Mehrotra Vice President Hazen and Sawyer P.C. www.hazenandsawyer.com Sponsored by
25. LID Development Conservation Minimization Soil Amendments Open Drainage Rain Gardens Rain Barrels Pollution Prevention Disconnected Decentralized Distributed Multi-functional Water Use Multiple Systems
26. Good Drainage Paradigm The Problem: Conventional Site Design Collect Concentrate Convey Centralized Control
30. Lot Level Source Controls LID Site Create a Hydrologically Functional Lot Conservation Open Drainage Rain Gardens Amended Soils Rain Barrel Porous Pavement Narrower Streets
49. IMP Effect or Function Slow Runoff Filtration Infiltration Retention Detention Evaporation Water Quality Control Soil Amendments X X x Bioretention X X X X X X Vegetated Buffers X X X X Grassed Swales X X X X Rock Swales X X X X Rain Barrels X Street Trees X Vegetated Roofs X X X X Permeable Materials X X X Rock Beds X X X X
LID development uses every part of the landscape to maintain the natural runoff conditions. This graphic shows how the LID techniques can be incorporated into every part of the lot design. The roofs, pavement, road design, soils, and landscaping elements have been modified to store, detain, infiltrate or filter runoff.
The design of each lot is then incorporated into the overall site plan to create this “functional” landscape within the built environment.