Geosynthetic BMPs for Storm Water Management engineered ... · Geosynthetic BMPs for Storm Water Management A Cellular Confinement System (CCS) is an ... Steep Access Road / Surface

Geosynthetic BMPsfor Storm Water Management.

May 3rd, Berks County Ag Center,Leesport,PA

ASCE Lehigh Valley Section Workshop /Warren Cohn CPESC ACF Environmental

Section Three – Run Off Management1

RUN OFFCONTROLS

PorousParking &

VehicleAccess

Cellular ConfinementSystems (CCS)

Geosynthetic BMPs for Storm Water Management A Cellular Confinement System (CCS) is anengineered, expandable, polyethylene,

honeycomb-like cellular structure.

CCS cells and panels are available varioussizes.

Width - 10 Cells Width - 8 Cells Width - 5 Cells

Small Cell

Medium Cell

Large Cell

3”

4”

6”

8”

CCS cells and panels are available variousheights.

10 mmDIAMETER

HOLES(TYPICAL)

PERFORATEDCELL WALL

INTERLOCKBETWEEN

PARTICLESAT EACH

PERFORATION

ENHANCEDLOAD TRANSFERBETWEEN CELL

WALL AND INFILL

CCS Cell Properties: Perforated Cell Walls.

10 mmDIAMETER

HOLES(TYPICAL)

PERFORATEDCELL WALL

CROSS CELLFLOW OF WATERAND NUTRIANTS







10 mmDIAMETER

HOLES(TYPICAL)

PERFORATEDCELL WALL

CROSS CELLGRASS ROOT

LOCK-UP

SECTION A-A

TEXTURED CELLWALL SURFACE

A

A

TEXTUREDCELL WALL

CCS Cell Properties: Textured Surface

OPTIMUM CELLWALL / INFILLINTERFACEFRICTION

Palletized CCS is delivered to project sites. The CCS is expanded and then installed.

• Tendons

– Kevlar

– High StrengthPolyester

– Polypropylene

– Special devices

CellularConfinement

Systems (CCS)

Components

CCS Components – Anchors





CCS Components: Staples & Stapling devices

Geosynthetics:

ECBs & TRMs / Geotextiles / Grids / Geomembranes

Topsoil Infill

Infill options for theCCS include free

draining soil, sand,stone, concrete or

mixtures of soil withsand and/or stone.

The CCS structure will enhance theperformance of any infill materials. Load Support

ShearSurface

CCSApplications

A CCS in a load support application is amulti-component, engineered system

consisting of:

CCS Load Distribution

•A specifically sized geocell (cell area and depth).

•A geosynthetic separation layer between the in-situsoils and the structural infill materials when thosematerials are different from each other (this layer isnot needed when the underlying soil type and the infillmaterial are the same).

•A structural infill material which is placed andcompacted in the cell.

Virtually all manufacturers offer basic designguidance, some offer preliminary evaluations.








CCS Gravel parking: Site is prepared.

CCS panels are expanded and stapled. Infill is placed onto expanded CCS.





Infill is spread and compacted into CCS. Completed CCS Gravel parking Application.

Comparison of CCS gravel parking area vsconventional gravel lot during a rain event.

Pa. American Water Co. / West Decatur, PA Water Tank

Steep Access Road / Surface Stability Application / April 2003

Unexpanded, palletized CCS panels on site. Grade surface and cut termination trenches.





Finish grade road / install geotextile fabric Pre-attach panels before expanding intoplace…

Expand panels and anchor in place. Filling cells with a 2A stone w/ 2” wearingsurface

Some hand work may be needed to finish-grade surface.

Finished installation





Steel Structures Industrial Yard Rutting of unconfined gravel caused costly maintenanceproblems for both the yard and equipment

UNCONFINED GRANULAR PAVEMENT SYSTEM

AGGREGATE BASE

SUBGRADE

The engineered solution called for a combination ofCellular Confinement and Geotextile…

…a specific section was designed based onloads, numbers of passes, etc…

SURFACE

CCS SECTION

INFILL

SUBBASE

GEOTEXTILE

SUBGRADE

Sub-grade

Sub-baseGeotextile

Cellular Confinement panel is held open with sand bags. CCS Panels stapled together and ready for in-fill





Panels are easily fit around protrusions. In-filling Cellular Confinement with stone.

More panels are staged as construction continues CCS stone infill is compacted with standardequipment.

Large section of stone filled CellularConfinement.

Section completed adjacent to curb





Field testing completed CCS application. Field testing completed CCS application.

THE GEOWEB GRANULAR PAVEMENT SYSTEM

SUBGRADE

AGGREGATE SUBBASE

SURFACE

GEOWEB SECTION

Field testing completed CCS application. Field testing completed CCS application.

USD HomeMPSS WQI GCLs PP&VA WMPP PPPS SC EP SS <CCS

CCS filled with stone can provide a cost effective and easy toconstruct pervious roadside treatment.

Filling CCS with stone and soil mixture will facilitate final turfsurface.





Filling CCS with stone and soil mixture will facilitate final turfsurface.

CCS Pavement Base Rehabilitation

CCS Load Distribution Stream Crossing Heavy duty industrial use facility

Heavy duty industrial use facility CCS Load Distribution: Road over Soft Soils.





CCS LoadDistribution:

Temporary Roadover Soft Soils.

CCS LS Applications and Concepts Supported

The CCS as a load support system can beused in a wide variety of applications:

•Load support systems over non-supportivesoils,•Surface stabilization of unstable aggregatesareas (parking lots and roadsides),•Stabilization of road bases to reduce sitedisturbance and provide greater pavement life,•Vegetated load support systems (parking andemergency access areas).

CCS LS Applications and Concepts Supported

A CCS can support the non-structural andstructural BMPs listed below:

•Protect/utilize natural flow pathways in overallstormwater planning and design• Minimize soil compaction in disturbed areas•Reduce Impervious Cover•Reduce Street Imperviousness•Reduce parking Imperviousness•Runoff Volume / Infiltration based•Vegetative and soil based•Vegetated Filter Strips•Porous pavement with infiltration beds

H H

CCS Key Benefits

The CCS provides the following benefits:

•In-filled can be stone or soil for permeablepaving/parking applications•Reduction in depth of engineered baserequirements leading to reduced sitedisturbance•The CCS can be rapidly placed to provideimmediate load support.

H

Key Design ElementsThe CCS for load support uses the following

elements:•a geosynthetic separation layer, may be:

*non-woven geotextile for soil type separation,*woven geotextile for reinforcement and soil typeseparation,

•an appropriately sized geocell section:*small or medium cell size

*4, 6, 8, 9.5 inch depth•cell infill materials(s), may be:

*aggregate*aggregate / topsoil blend

H

Key Design ConsiderationsKey design considerations in determiningwhich of proper selection of, and designwith, the components will be as follows:•Stone versus vegetated infill.•If a vegetated solution is desired access timeand sustainability of turf have to be considered(traffic may have to be kept off the CCS tofacilitate healthy establishment of the vegetatedinfill).•Vehicle loads and frequency of will play asignificant role in proper selection and design ofa CCS load support project.





H

Preconstruction checklist(site walk-through check list)Prior to construction, check:

•Site grading plan•Presence of CCS materials

•Geotextile separation layer if required•Geocell materials•Infill, if other than from site excavations

•Presence of installation tools•Presence of installation instructions•Presence of qualified manufacturersrepresentative if required

H

Post construction inspection checklistDuring and after construction, check:

•Is grade and elevation as specified•Has the separation layer been placed•Are the geocell sections expanded correctly

•infilled with the specified infill•is infill compacted to specification

•If vegetated, are the appropriate seed andnutrients applied

Documents

Geosynthetic BMPs for Storm Water Management engineered ... · Geosynthetic BMPs for Storm Water Management A Cellular Confinement System (CCS) is an ... Steep Access Road / Surface