fact sheet pervious pavement with infiltration · the pervious pavement may consist of asphalt,...

FACT SHEET DESCRIPTION Pervious pavement is a Green Infrastructure (GI) technique that combines stormwater infiltration, storage, and structural pavement consisting of a permeable surface underlain by a storage/infiltration bed. Pervious pavement is well suited for parking lots, walking paths, sidewalks, playgrounds, plazas, tennis courts, and other similar uses. A pervious pavement system consists of a pervious surface course underlain by a storage bed placed on uncompacted subgrade to facilitate stormwater infiltration. The storage reservoir may consist of a stone bed of uniformly graded, clean and washed course aggregate with a void space of approximately 40% or other pre-manufactured structural storage units. The pervious pavement may consist of asphalt, concrete, permeable paver blocks, reinforced turf/gravel, or other emerging types of pavement. Pervious Pavement with Infiltration BENEFITS • Volume control & GW recharge, moderate peak rate control • Versatile with broad applicability • Dual use for pavement structure and stormwater management Potential Limitations • Careful design & construction required • Pervious pavement not suitable for all uses • Higher maintenance needs than standard pavement • Steep slopes Alley 148 pervious pavers City of Lancaster, PA Alley connected to Plum Street parking lot City of Lancaster, PA YOUR WATER. YOUR MONEY. YOUR CITY. Potential Applications Residential Yes Commercial Yes Ultra Urban Yes Industrial Yes Retrofit Yes Highway Limited Recreational Yes Public Yes Conceptual diagram showing how porous pavement functions

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FACT SHEET

DESCRIPTION

Pervious pavement is a Green Infrastructure (GI) technique that combines stormwater infiltration, storage, and structural pavement consisting of a permeable surface underlain by a storage/infiltration bed. Pervious pavement is well suited for parking lots, walking paths, sidewalks, playgrounds, plazas, tennis courts, and other similar uses.

A pervious pavement system consists of a pervious surface course underlain by a storage bed placed on uncompacted subgrade to facilitate stormwater infiltration. The storage reservoir may consist of a stone bed of uniformly graded, clean and washed course aggregate with a void space of approximately 40% or other pre-manufactured structural storage units. The pervious pavement may consist of asphalt, concrete, permeable paver blocks, reinforced turf/gravel, or other emerging types of pavement.

Pervious Pavement with Infiltration

BENEFITS

• Volume control & GW recharge, moderate peak rate control

• Versatile with broad applicability

• Dual use for pavement structure and stormwater management

Potential Limitations

• Careful design & construction required

• Pervious pavement not suitable for all uses

• Higher maintenance needs than standard pavement

• Steep slopes

Alley 148 pervious paversCity of Lancaster, PA

Alley connected to Plum Street parking lotCity of Lancaster, PA

YOUR WATER. YOUR MONEY. YOUR CITY.

Potential Applications

Residential Yes

Commercial Yes

Ultra Urban Yes

Industrial Yes

Retrofit Yes

Highway Limited

Recreational Yes

Public Yes

Conceptual diagram showing how porous pavement functions

Page 2: FACT SHEET Pervious Pavement with Infiltration · The pervious pavement may consist of asphalt, concrete, permeable paver blocks, reinforced turf/gravel, or other emerging types of

KEY DESIGN FEATURES

Infiltration testing required

Do not infiltrate on compacted soil

Level storage bed bottoms

Provide positive storm water overflow from bed

Surface permeability >20”/hr

Secondary inflow mechanism recommended

Pretreatment for sediment-laden runoff

SITE FACTORS

Water Table/Bedrock Separation: 2-foot minimum

Soils: HSG A and B preferred; HSG C & D may require underdrains

Feasibility on steeper slopes: Low

Potential Hotspots: Not without design of pretreatment system/impervious liner

MAINTENANCE

• Clean inlets

• Vacuum annually

• Maintain adjacent landscaping/planting beds

• Periodic replacement of paver blocks

• Maintenance cost: approximately $400-500 per year for vacuum sweeping of a half acre parking lot

COST

• Varies by porous pavement type

• Local quarry needed for stone filled infiltration bed

• $7-$15 per square foot, including underground infiltration bed

• Generally more than standard pavement, but saves on cost of other BMPs and traditional drainage infrastructure

Stormwater Quality Functions Stormwater Quality Functions Additional ConsiderationsVolume High Total Suspended Solids High Capital Cost Medium

Groundwater Recharge High Total Phosphorus Medium Maintenance Medium

Peak Rate Medium / High Total Nitrogen High Winter Performance Medium / High

Erosion Reduction Medium / High Temperature High Fast Track Potential Low / Medium

Flood Protection Medium / High - - Aesthetics Low / Medium

For more information about the Green Infrastructure program please contact: Fritz [email protected](717) 392-7891 ext. 207

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