Putting It All Together Integrated Natural Resource Protection, Stormwater Management and Site Desig - PowerPoint PPT Presentation

Loading...

PPT – Putting It All Together Integrated Natural Resource Protection, Stormwater Management and Site Desig PowerPoint presentation | free to view - id: 817b8-ZDc1Z



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Putting It All Together Integrated Natural Resource Protection, Stormwater Management and Site Desig

Description:

Putting It All Together Integrated Natural Resource Protection, Stormwater Management and Site Desig – PowerPoint PPT presentation

Number of Views:25
Avg rating:3.0/5.0
Slides: 49
Provided by: Mik7292
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Putting It All Together Integrated Natural Resource Protection, Stormwater Management and Site Desig


1
Putting It All Together Integrated Natural
Resource Protection, Stormwater Management and
Site Design
Mike Novotney, P.E. (MD) Center for Watershed
Protection
2
Stormwater Site Design Criteria
3
Meeting the Stormwater Site Design Criteria
  • Satisfying these criteria requires the successful
    integration of natural resource protection and
    stormwater management with the site planning and
    design process
  • This integration can be accomplished by using an
    approach to the site planning and design process
    that
  • (1) identifies and protects valuable natural
    resources
  • (2) limits land disturbance and the creation of
    new impervious and disturbed pervious cover
  • (3) reduces and manages post-construction
    stormwater runoff rates, volumes and pollutant
    loads

4
Natural Resource Protection Stormwater
Management Practices Techniques
  • This approach involves the use of two distinct,
    but complementary groups of natural resource
    protection and stormwater management techniques
  • Green Infrastructure Practices
  • Natural resource protection and stormwater
    management practices and techniques (e.g., better
    site planning and design techniques, low impact
    development practices) that can be used to help
    prevent increases in post-construction stormwater
    runoff rates, volumes and pollutant loads
  • Used to protect natural resources from the direct
    impacts of the land development process, limit
    land disturbance and the creation of new
    impervious and disturbed pervious cover, and
    reduce post-construction stormwater runoff rates,
    volumes and pollutant loads
  • Stormwater Management Practices
  • Stormwater management practices (e.g., wet ponds,
    swales) that can be used to manage
    post-construction stormwater runoff rates,
    volumes and pollutant loads.

5
How do I best use these practices during the site
planning and design process?
  • Need guidance for the developer, site designer
    and plan reviewer
  • Stick with the existing process
  • But make sure that we consider natural resource
    protection and stormwater management from the
    very beginning of process

6
Six-step stormwater management planning and
design process
7
Prior to Site Assessment
  • Have a project idea or find a site that leads to
    an idea
  • Develop knowledge of all applicable constraints
    and requirements
  • Make a basic go or no go decision
  • Goal is to understand the site constraints and
    possibilities without investing too much time and
    money

8
Prior to Site Layout
  • Complete site assessment natural resources
    inventory
  • Develop site fingerprint
  • Identify primary and secondary conservation areas
    and buildable area
  • Goal is to ID important resources and reduce
    impacts of land development by design

9
(No Transcript)
10
Step 4 Prepare Stormwater Management Concept Plan
11
Can complete iterative process using Coastal
Georgia Site Planning Design Worksheet…
12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
  • Lets walk through an example
  • Peachtree Strip Mall

16
Farm Field
  • Our site is pretty basic

Natural Vegetation
Small Pond
17
  • Peachtree Strip Mall
  • Conventional Design

18
(No Transcript)
19
Concept Plan
Concentrated Parking Area
Disturbed Pervious Area
Restaurant
Shops
Drugstore
Shops
Supermarket
Detention Pond
Disturbed Pervious Area
PEACHTREE STRIP MALL CONVENTIONAL DESIGN
20
Peachtree Strip Mall Conventional Design
  • HSG B Soils
  • Area 18 acres
  • Impervious Cover 15.2 acres
  • I 84 impervious
  • RRv
  • (0.05 0.00984)1.21218
  • 1.46 ac-ft
  • Assume Tc 15 min.
  • P 3.6 in
  • ARPv 2.65 ac-ft

21
Concept Plan
Concentrated Parking Area
Disturbed Pervious Area
Restaurant
We can probably do a better job protecting
natural resources and reducing stormwater runoff
rates, volumes and pollutant loads…
Shops
Drugstore
Shops
Supermarket
Detention Pond
Disturbed Pervious Area
PEACHTREE STRIP MALL CONVENTIONAL DESIGN
22
  • Peachtree Glen
  • Innovative Design Using Green Infrastructure
    Practices

23
(No Transcript)
24
Farm Field
  • Our site is pretty basic

Natural Vegetation
Better Site Planning Technique Preserve
Secondary Conservation Areas
Small Pond
25
Better Site Design Technique Reduce Clearing
and Grading Limits
Better Site Design Technique Reduce Parking Lot
Footprint
Better Site Design Technique Create Landscaping
Islands in Parking Lot
26
Sketch Plan
Shops
Drugstore
Shops
Shops
Supermarket
Restaurant
PEACHTREE GLEN INNOVATIVE DESIGN
27
Concept Plan
Shops
Drugstore
Shops
Shops
Supermarket
Restaurant
Conservation Areas
PEACHTREE GLEN INNOVATIVE DESIGN
28
(No Transcript)
29
Site Information
  • Assume Tc 15 min.
  • P 3.6 in
  • ARPv 2.35 ac-ft
  • 12 savings
  • HSG B Soils
  • Area 18 acres
  • Impervious Cover 13.6 acres
  • I 76 impervious
  • RRv
  • (0.009760.05)1.21218
  • 1.31 ac-ft
  • Was 1.45 ac-ft
  • 10 savings even before stormwater management
    credits

Next, apply credits…
30
Same number of parking spaces but with slightly
narrower widths
Conservation Area
Shops
Drugstore
Shops
Shops
Supermarket
Restaurant
Conservation Area
PEACHTREE GLEN BETTER SITE DESIGN
31
After Better Site Planning/Design Credits
  • RRv
  • (0.009760.05)1.212(18-3.9)
  • 1.03 ac-ft
  • Was 1.45 ac-ft, then 1.31 ac-ft
  • 29 savings over conventional design with
    credits

32
(No Transcript)
33
Low Impact Development Practice Selection
  • In general, the following information should be
    considered when deciding what green
    infrastructure practices should be used on a
    development site
  • Ability to Help Satisfy the Stormwater Management
    Criteria (Table 7.1)
  • Overall Feasibility (Table 7.2)
  • Site Applicability (Table 7.3)
  • In addition, site planning and design teams
    should consider how the following site
    characteristics and constraints, which are
    commonly encountered in coastal Georgia, will
    influence the use of green infrastructure
    practices on a development site
  • Poorly drained soils, such as hydrologic soil
    group C and D soils
  • Well drained soils, such as hydrologic soil group
    A and B soils
  • Flat terrain
  • Shallow water table
  • Tidally-influenced drainage

34
Table 7.1 Ability to Help Satisfy the Stormwater
Management Criteria
35
Table 7.2 Overall Feasibility
36
Table 7.3 Site Applicability
37
Practice Selection
  • We might have picked grass channels or dry swales
    for conveyance
  • But we protected the natural drainage features as
    a secondary conservation area
  • We might consider green roofs or permeable
    pavement
  • We might also think about rainwater harvesting or
    stormwater planters
  • Lets start with bioretention areas and sheetflow
    to conservation areas
  • Can use distributed landscaping areas to
    receive stormwater runoff

38
Sheetflow to Cons. Area
0.4 ac
Shops
Drugstore
Shops
Shops
Supermarket
Restaurant
Sheetflow to Cons. Area
1.8 ac
PEACHTREE GLEN INNOVATIVE DESIGN
39
Bioretention
Area 1
Areas 2 3
40
(No Transcript)
41
Apply Runoff Reduction Credits
  • Target RRv 1.03 ac-ft
  • Apply runoff reduction credits for each of our
    low impact development practices
  • Site Planning Design Worksheet helps automate
    this process, so lets go there…

42
(No Transcript)
43
Check Stormwater Management Criteria
  • If we havent completely satisfied the criteria,
    we may want to go back to the concept plan to
    apply additional low impact development practices
    to further reduce post-construction stormwater
    runoff rates, volumes, and pollutant loads…

44
(No Transcript)
45
Apply Stormwater Management Practices
  • If we determine that the criteria cannot be
    satisfied exclusively through the use of green
    infrastructure practices, the next step is to
    apply stormwater management practices to the site
  • Lets try a stormwater pond to satisfy the
    remainder of the criteria…

46
Shops
Drugstore
Shops
Shops
Supermarket
Restaurant
Overland Flow Area
1.8 ac
PEACHTREE GLEN INNOVATIVE DESIGN
47
Stormwater Pond
48
Moving on to Final Design
  • Discuss concept plan with local development
    review authority
  • Further develop stormwater management plan
  • Include details about green infrastructure and
    stormwater management practice design
About PowerShow.com