DESIGNING SUSTAINABLE SITES

Transcription

1 DESIGNING SUSTAINABLE SITES HOW TO GET YOUR NPDES / PCSM PLAN APPROVED MARCH 17, 18, 2016 ST VINCENT / FRED RODGERS CENTER BY: KATHY HAMILTON RLA, WESTMORELAND CONSERVATION DISTRICT

2 LEARNING OBJECTIVES Review the guiding principles of Low Impact Development (LID) and Green Infrastructure (GI) Compare the advantages of LID and GI Technologies with traditional stormwater infrastructure design Select location appropriate LID and GI technologies for a site to meet NPDES and PCSM requirements

3 DEFINITION : SUSTAINABLE DEVELOPMENT Meeting the needs of the present without compromising the ability of future generations to meet their own needs. The 3 pillars of sustainability* are: Environment Economy Society Sustainable *according to the 2005 World Summit at the United Nations in NYC

4 HOW CAN SWM DESIGN ADDRESS 3 PILLARS? Protect the environment by providing water quality improvements and volume reduction Create jobs using new and varied technologies Reduce costs from flooding events Benefit the community with cleaner water, cleaner air, healthier and biodiverse habitats, shade in the urban heat island, and more

5 GREY INFRASTRUCTURE VS GREEN INFRASTRUCTURE* Grey Infrastructure Challenges Aging infrastructure High construction, maintenance and repair costs Flood events, overloaded systems Increasing number of CSO events Introduction of pollutants into source waters New environmental concerns Green Infrastructure Benefits Environmental benefits water quality, air quality, groundwater recharge, reduced urban heat stress, energy savings Measureable reduction in CSO events Realized inancial benefits- reduced construction costs, reduced flood damage, green jobs Social benefits improved aesthetics, potential economic development, increased public education in stormwater management * Philadelphia Water Department Triple Bottom Line Analysis of CSO Options EPA Case Study 2013

6 HOW CAN SUSTAINABLE SITE DESIGN MEET NPDES? LOW IMPACT DEVELOPMENT TECHNIQUES* Protect sensitive / special value resources Cluster and concentrate Minimize disturbance and maintenance Reduce impervious cover Disconnect / Distribute / Decentralize Source control *2006 PA SW BMP MANUAL

7 PROTECT SENSITIVE RESOURCES /NATURAL FLOW PATHS

8 MINIMIZE DISTURBANCE BY CLUSTERING, CONTOUR DESIGN

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12 MINIMIZE DISTURBANCE: REDUCE IMPERVIOUS AREAS

13 DISCONNECT AND DISTRIBUTE: DOWNSPOUT DISCONNECT TO VEGETATION

14 THE MORE LID USED, THE LE$$ GI NEEDED DEP allows up to 20% reduction in SWM volumes using LID Full and fair comparison of green vs grey infrastructure for stormwater management Triple Bottom Line (tbl) financial social and environmental considerations Greater benefits of LID/GI Sustainable Triple bottom line

15 HOW CAN SUSTAINABLE SITE DESIGN MEET NPDES? GREEN INFRASTRUCTURE TECHNIQUES* Pervious pavement Infiltration devices Rain garden Vegetated swale Vegetated roof Wet pond Forebay Riparian buffer Landscape restoration Soil amendments *2006 PA SW BMP MANUAL

16 PERMEABLE PAVING: LOW-VOLUME TRAFFIC AREAS

17 RAIN GARDEN OR BIORETENTION AT SOURCE

18 WATER QUALITY BASIN AND FOREBAY

19 LANDSCAPE RESTORATION

20 3 POINTS TO WIN Less is More Simplicity with necessary components Everything in its place (Fit the BMP to the site) Go native

21 TAKE HOME Use GI and LID techniques AT THE SOURCE to approach pre-development conditions Community liveablility is increased with pollutant reduction, stormwater reduction, energy use reduction, air quality improvements GI reduces stormwater, reduces pollutants, restores ecosystems, restores health and vitality of watersheds, restores natural hydrology Engineers / Landscape Architects must education and inform their clients

22 IF YOU WANT TO LEARN MORE: COMING UP NEXT at 2:00 pm NPDES permit Refresher with Jim Pillsbury PE MS with WCD A Case Study for Stream Restoration with Patrick Shirey Ecologist with RASmith National A Case Study for Stormwater BMPs with Michael Takacs RLA with CEC Inc COMING UP at 2:55 pm NPDES Refresher again PCSM Design Exercise with Kathy Hamilton RLA with WCD MS-4 Audits with Kevin Brett PE with LSSE Inc