county low impact development (lid) outreach

60
County County Low Impact Development Low Impact Development (LID) (LID) Outreach Outreach BRIAN LEADERS, RLA BRIAN LEADERS, RLA REGISTERED LANDSCAPE ARCHITECT REGISTERED LANDSCAPE ARCHITECT

Upload: skah

Post on 04-Feb-2016

29 views

Category:

Documents


0 download

DESCRIPTION

County Low Impact Development (LID) Outreach. BRIAN LEADERS, RLA REGISTERED LANDSCAPE ARCHITECT. Discussion Topics. _______________________________________________ What is a watershed? Why we need a Stormwater Management Ordinance Problems caused by not having a Plan - PowerPoint PPT Presentation

TRANSCRIPT

Page 1: County  Low Impact Development (LID)  Outreach

County County Low Impact Development Low Impact Development

(LID) (LID) OutreachOutreach

BRIAN LEADERS, RLABRIAN LEADERS, RLAREGISTERED LANDSCAPE ARCHITECTREGISTERED LANDSCAPE ARCHITECT

Page 2: County  Low Impact Development (LID)  Outreach

Discussion Topics Discussion Topics ______________________________________________________________________________________________

What is a watershed?What is a watershed? Why we need a Stormwater Management Why we need a Stormwater Management

OrdinanceOrdinance Problems caused by not having a PlanProblems caused by not having a Plan Urban Conservation ProblemsUrban Conservation Problems EPA “Today”EPA “Today” BMP’s (Best Management Practices)BMP’s (Best Management Practices) Iowa DNRIowa DNR

Page 3: County  Low Impact Development (LID)  Outreach

What is a Watershed?What is a Watershed?

Page 4: County  Low Impact Development (LID)  Outreach

A watershed is a geographic A watershed is a geographic area from which water drains area from which water drains

toward a toward a commoncommon watercourse (such as a lake, watercourse (such as a lake, stream or ocean) in a natural stream or ocean) in a natural

basin. basin.

Page 5: County  Low Impact Development (LID)  Outreach
Page 6: County  Low Impact Development (LID)  Outreach

When thinking of a watershed When thinking of a watershed do not just think of water, do not just think of water,

include land, include land, landuselanduse, , topography, geology etc. All of topography, geology etc. All of

these components affect these components affect watersheds. watersheds.

Page 7: County  Low Impact Development (LID)  Outreach

Why do we need a Why do we need a Stormwater Management Stormwater Management

Ordinance?Ordinance?

Page 8: County  Low Impact Development (LID)  Outreach

This is what we are seeing now!This is what we are seeing now!

Page 9: County  Low Impact Development (LID)  Outreach
Page 10: County  Low Impact Development (LID)  Outreach
Page 11: County  Low Impact Development (LID)  Outreach
Page 12: County  Low Impact Development (LID)  Outreach
Page 13: County  Low Impact Development (LID)  Outreach

Yes this is a paved street!Yes this is a paved street!

Page 14: County  Low Impact Development (LID)  Outreach

What problems are causedWhat problems are caused by not having a by not having a

Stormwater Management Stormwater Management Plan?Plan?

Page 15: County  Low Impact Development (LID)  Outreach

Watershed Hydrology BEFORE DevelopmentWatershed Hydrology BEFORE Development

evapotranspiration: 40-50%

interflow: 20-30%

surface runoff: <1%

www.psat.wa.gov/Programs/LID.htm

Page 16: County  Low Impact Development (LID)  Outreach

Watershed Hydrology AFTER DevelopmentWatershed Hydrology AFTER Development

evapotranspiration: ~25%

interflow: 0-30%

surface runoff: ~30%

www.psat.wa.gov/Programs/LID.htm

Page 17: County  Low Impact Development (LID)  Outreach

Urban Conservation Problems Urban Conservation Problems ______________________________________________________________________

Page 18: County  Low Impact Development (LID)  Outreach

Urban Conservation Problems Urban Conservation Problems ____________________________________________________________________ 10 to 20 times higher erosion than agriculture10 to 20 times higher erosion than agriculture

Page 19: County  Low Impact Development (LID)  Outreach

Urban Conservation Problems Urban Conservation Problems ______________________________________________________________________ Storm water runoff is carrying Storm water runoff is carrying high concentration of high concentration of

pollutantspollutants directly into creeks, stream and river. directly into creeks, stream and river.

Page 20: County  Low Impact Development (LID)  Outreach

Urban Conservation Problems Urban Conservation Problems ______________________________________________________________________ Developing in the fragile loess soils Developing in the fragile loess soils

Page 21: County  Low Impact Development (LID)  Outreach

Urban Conservation Problems Urban Conservation Problems ______________________________________________________________________ Rural vs. urban conflictsRural vs. urban conflicts

Page 22: County  Low Impact Development (LID)  Outreach

EPAEPAand and

Effluent Discharge LimitsEffluent Discharge Limits

Page 23: County  Low Impact Development (LID)  Outreach

Effluent Limitation GuidelinesEffluent Limitation Guidelines(ELG’s)(ELG’s)

______________________________________________________________________________________________

On December 1, 2009, the U.S. On December 1, 2009, the U.S. Environmental Protection Agency (EPA) Environmental Protection Agency (EPA) released effluent limits on stormwater released effluent limits on stormwater dischargesdischarges from many construction and from many construction and development sites (the Construction Rule). development sites (the Construction Rule). (74 Fed. Reg. 62,996)(74 Fed. Reg. 62,996)11

Page 24: County  Low Impact Development (LID)  Outreach

The Construction Rule became effective The Construction Rule became effective February 1, 2010, and imposes the February 1, 2010, and imposes the following general requirements:following general requirements:

__________________________________________________________________________________________________________________________________________________________________

1)1) Non-numericNon-numeric limitations apply to construction limitations apply to construction activity that disturbs activity that disturbs one or more acres;one or more acres;

2)2) Beginning August 2, 2011Beginning August 2, 2011, a numeric turbidity , a numeric turbidity limit and related monitoring requirements will limit and related monitoring requirements will apply to construction apply to construction activity that disturbs 20 or activity that disturbs 20 or more acres at one time;more acres at one time;

Page 25: County  Low Impact Development (LID)  Outreach

Numeric TurbidityNumeric Turbidity______________________________________________________________________________________________

20 32 50 110 178 345 412

EPA’s Numeric Turbidity Limit is 280.

Page 26: County  Low Impact Development (LID)  Outreach

3) 3) No later than February 2, 2014No later than February 2, 2014, the numeric , the numeric turbidity limit will apply to projects that disturbs turbidity limit will apply to projects that disturbs 10 or more acres.10 or more acres.

Page 27: County  Low Impact Development (LID)  Outreach

EPA’s EPA’s Main GoalsMain Goals

____________________________________________________________________________________________________________

Preserve and improve Preserve and improve water qualitywater quality on a on a national scale.national scale.

Reduce sediment dischargedReduce sediment discharged from from construction sites by construction sites by four billion pounds four billion pounds each year.each year.

Page 28: County  Low Impact Development (LID)  Outreach

Effective Controls and Required Effective Controls and Required BMP’sBMP’s

________________________________________________________________________________________________________________

Controls are considered Controls are considered EffectiveEffective When: When:

“…“…bare soil is uniformly and evenly coveredbare soil is uniformly and evenly covered with vegetation or other suitable materials, with vegetation or other suitable materials, storm water is controlled so that rills or storm water is controlled so that rills or gullies are not visible and channels or gullies are not visible and channels or stream banks are stream banks are not erodednot eroded. .

Page 29: County  Low Impact Development (LID)  Outreach

Selecting temporarySelecting temporary BMP’S BMP’S

(Best Management Practices)(Best Management Practices) for you!for you!

Page 30: County  Low Impact Development (LID)  Outreach

Down Gradient Perimeter Down Gradient Perimeter ControlControl

________________________________________________________________________________________________

Page 31: County  Low Impact Development (LID)  Outreach

Ditch ChecksDitch Checks______________________________________________________________________________________________

Page 32: County  Low Impact Development (LID)  Outreach

Channel ProtectionChannel Protection______________________________________________________________________________________________

Page 33: County  Low Impact Development (LID)  Outreach

Temporary PondingTemporary Ponding______________________________________________________________________________________________

Page 34: County  Low Impact Development (LID)  Outreach

Construction PhasingConstruction Phasing______________________________________________________________________________________________

Page 35: County  Low Impact Development (LID)  Outreach

Access ProtectionAccess Protection______________________________________________________________________________________________

Page 36: County  Low Impact Development (LID)  Outreach

Inlet ProtectionInlet Protection______________________________________________________________________________________________

Page 37: County  Low Impact Development (LID)  Outreach

Temporary Cover & ProtectionTemporary Cover & Protection______________________________________________________________________________________________

Page 38: County  Low Impact Development (LID)  Outreach

Spoil and Stockpile AreasSpoil and Stockpile Areas______________________________________________________________________________________________

Page 39: County  Low Impact Development (LID)  Outreach

Selecting permanentSelecting permanent BMP’S BMP’S

(Best Management Practices)(Best Management Practices) for you!for you!

Page 40: County  Low Impact Development (LID)  Outreach

Rain GardenRain Garden______________________________________________________________________________________________

Page 41: County  Low Impact Development (LID)  Outreach

Infiltration BermInfiltration Berm______________________________________________________________________________________________

Page 42: County  Low Impact Development (LID)  Outreach

Soil TestingSoil TestingInfiltration and EmbankmentInfiltration and Embankment______________________________________________________________________________________________

Page 43: County  Low Impact Development (LID)  Outreach

Sand FiltersSand Filters______________________________________________________________________________________________

Page 44: County  Low Impact Development (LID)  Outreach

Dry Detention Dry Detention ______________________________________________________________________________________________

Page 45: County  Low Impact Development (LID)  Outreach

Wet Detention Wet Detention ______________________________________________________________________________________________

Page 46: County  Low Impact Development (LID)  Outreach

Constructed Wetlands Constructed Wetlands ______________________________________________________________________________________________

Page 47: County  Low Impact Development (LID)  Outreach

Grassed Swales Grassed Swales ______________________________________________________________________________________________

Page 48: County  Low Impact Development (LID)  Outreach

Dry and Wet Swales Dry and Wet Swales ______________________________________________________________________________________________

Page 49: County  Low Impact Development (LID)  Outreach

Grassed Vegetated Grassed Vegetated Filter Strips Filter Strips ______________________________________________________________________________________________

Page 50: County  Low Impact Development (LID)  Outreach

Pervious Pavement Pervious Pavement ______________________________________________________________________________________________

Page 51: County  Low Impact Development (LID)  Outreach

Open Channel Flow Open Channel Flow ______________________________________________________________________________________________

Page 52: County  Low Impact Development (LID)  Outreach

Iowa Senate File Bills Iowa Senate File Bills ______________________________________________________________________________________________

Working on an act related to Working on an act related to flood plain management.flood plain management.

Page 53: County  Low Impact Development (LID)  Outreach

In a nut shell… In a nut shell… ______________________________________________________________________________________________

Prohibit the reconstruction of structures and Prohibit the reconstruction of structures and infrastructureinfrastructure substantially damaged by floods in a substantially damaged by floods in a floodway.floodway.

Limit reconstruction or new construction in a flood plain.Limit reconstruction or new construction in a flood plain. Require new construction of facilities Require new construction of facilities critical for health critical for health

and safety of the public and the environmentand safety of the public and the environment to be to be located in areas that are not flood plains whenever located in areas that are not flood plains whenever practicable.practicable.

Page 54: County  Low Impact Development (LID)  Outreach

In a nut shell… In a nut shell… ______________________________________________________________________________________________

Conduct a subsurface tiling studyConduct a subsurface tiling study to determine the to determine the impact that tile drainage has impact that tile drainage has on infiltration, surface on infiltration, surface runoff, and flooding.runoff, and flooding.

Evaluate the feasibility of seasonal retention of water Evaluate the feasibility of seasonal retention of water in in

tile drained fields as a drainage management strategy.tile drained fields as a drainage management strategy.

Integrate multipurpose wetlandsIntegrate multipurpose wetlands into watersheds. into watersheds.

Page 55: County  Low Impact Development (LID)  Outreach

In a nut shell… In a nut shell… ______________________________________________________________________________________________

DNR will seek funding to plan, implement, and monitor a DNR will seek funding to plan, implement, and monitor a watershed demonstration pilot project watershed demonstration pilot project for urban and rural for urban and rural areas involving a twelve=digit hydrologic unit code areas involving a twelve=digit hydrologic unit code subwatershed as defined by the United States geological subwatershed as defined by the United States geological survey. survey.

Page 56: County  Low Impact Development (LID)  Outreach

In a nut shell… In a nut shell… ____________________________________________________________________________________________IOWA DNR WILL CONDUCT A STUDY PROJECT THATIOWA DNR WILL CONDUCT A STUDY PROJECT THATSHALL INCLUDE FEATURES THAT SEEK TO DO THESHALL INCLUDE FEATURES THAT SEEK TO DO THEFOLLOWING:FOLLOWING:

11. Maximize soil water holding capacity. Maximize soil water holding capacity from rain. from rain. 2. 2. Minimize severe scour erosion Minimize severe scour erosion and sand depositionand sand deposition during floods. during floods. 3. 3. Manage water runoff in uplandsManage water runoff in uplands under saturated soil under saturated soil moisture conditions.moisture conditions. 4. 4. Reduce and mitigateReduce and mitigate structural and nonstructural structural and nonstructural floodflood damage.damage.

Page 57: County  Low Impact Development (LID)  Outreach

In a nut shell… In a nut shell… ______________________________________________________________________________________________ DNR will change DNR will change climate criteria climate criteria due to due to

weather changes. weather changes. Adopt minimum storm water standards Adopt minimum storm water standards to to

be implemented be implemented July 1,2011 July 1,2011 to limit:to limit:

1.1. Limit water runoffLimit water runoff2.2. Reduce potential future flood damageReduce potential future flood damage3.3. Assess effects of stream channelizationAssess effects of stream channelization4.4. Improve watershed management for both water quantity Improve watershed management for both water quantity

and quality.and quality.

Page 58: County  Low Impact Development (LID)  Outreach

In a nut shell… In a nut shell… ______________________________________________________________________________________________

Modify Modify NPDESNPDES permits permits to require the mitigation of to require the mitigation of soil soil compaction and replacement of topsoilcompaction and replacement of topsoil as part of the as part of the completion of construction for permitted actions completion of construction for permitted actions involving involving one or more acresone or more acres of disturbed land. of disturbed land.

Page 59: County  Low Impact Development (LID)  Outreach

Stormwater Management is Stormwater Management is here.here.

Page 60: County  Low Impact Development (LID)  Outreach

Questions? Questions? ______________________________________________________________________________________________Special thanks to the following sources:Special thanks to the following sources:

Mike Isensee CPESC, Urban ConservationistMike Isensee CPESC, Urban Conservationist Farmington, MinnesotaFarmington, Minnesota

Blayne W. Renner, NPDES Stormwater CoordinatorBlayne W. Renner, NPDES Stormwater Coordinator

Iowa Department of Ag. And Land StewardshipIowa Department of Ag. And Land Stewardship

Natural Resource Conservation ServicesNatural Resource Conservation Services

--______________________________________________________________________________________________________________________________BRIAN LEADERS, RLA BRIAN LEADERS, RLA REGISTERED LANDSCAPE ARCHITECTREGISTERED LANDSCAPE ARCHITECT25966 ROSEWOOD ROAD25966 ROSEWOOD ROADUNDERWOOD, IOWA 51576UNDERWOOD, IOWA 51576402-670-9700402-670-9700