Low Impact Development Training Design Exercise Presented by: The Low Impact Development Center,...

Low Impact Development TrainingDesign Exercise

Presented by:

The Low Impact Development Center, Inc. A non-profit water resources and sustainable design organizationwww.lowimpactdevelopment.org

Copyright 2009 Low Impact Development Center, Inc.

• Application of Concepts

• New and Redevelopment

• New VA and MD SWM Concepts

• EISA Requirements

Objectives


Redevelopment

• Replace Parking Lot

• Correct poor drainage around building

• Improve pedestrian circulation


Redevelopment

• Program development goals

• SWM requirements and objectives

• Identify critical resource areas

• Opportunities and Constraints

• Retrofit strategies

• Retrofit techniques

• Identify Benefits


New Development

• Construct new office with similar footprint

• Connect circulation with existing site

• Identify potential environmental issues


LID UFC Process

• Define Planning Goals

• Perform Site Evaluation

• Develop LID Strategies

• Prepare LID Concept Design

• Target O & M Strategy


• % Imperviousness (assume 65%)

• Rainfall Depth/ESD Runoff Depth

• QE = PE*Rv 0r ~1.24”

• Post Cn > Pre and PE>1 inch so calc Cpv

• Approx 0.4 inch depth over surface so if 30 acres then 4,500 cf

Virginia Key Points


Maryland Key Points

• Redevelopment (Assume 40% imperviousness):• Reduce Impervious area by 50% or,• ESD/LID for wq for 50% or,• ESD and reduction for 50%

• OR• On-site structural or,• Off-site structural for 50% or, • Or Combination

• OR• Retrofit off-site• Stream restoration• Trading• Planning

• AND… • Implement ESD for NET INCREASE in impervious areas


EISA 438: Norfolk 95Th Percentile

• 1.63 Inches


UFC Tools

• LID Manual NRCS Charts

• 95th Percentile Charts

Low Impact Development Training Design Exercise Presented by: The Low Impact Development Center,...

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