Some jurisdictions offer incentives for storm water quantity reduction or have limits on impervious cover; where this is the case, we recommend that you discuss using PCIP with your local municipal and/or regulatory agency before proceeding with your project. If the agency is not familiar with PICP, Oaks staff can provide in-house training and design support. Some common misconceptions about PICP: 1. PICP can not be used in vehicular applications. Permeable pavers are suitable for a wide range of vehicular applications, provided that speed limits are less than 65 km/hr (40mph). 2. PICP are not safe in pedestrian areas. Early versions of permeable pavers were a concern for pedestrians because of their large openings. Oaks more modern permeable pavers are designed to be safe for wheelchairs and pedestrians, and are heel-safe. (Details on Page 10) 3. PICP cannot be used on clay soils. Provided that the system is designed accordingly, PICP can be used on any type of soil. (Details below) 4. PICP systems are too expensive to build and maintain. Factoring the total cost of pavement, drainage infrastructure, storm water quality management and land, PICP can be a cost-effective option. (Details on page 19) Selecting Which PICP System To Use PERMEABLE PAVEMENT TYPES There are three main types of Permeable Pavement designs: Full-Infiltration, Partial-Infiltration and No-Infiltration, each referring to the amount of water that infiltrates into the native sub-grade.
SUB-GRADE INFILTRATION FEASIBLE/ PERMITTED
INPUT EXCEEDS INFILTRATION CAPACITY
FULL INFILTRATION: Use Full-Infiltration systems where the infiltration rate of the native soils exceeds the amount of water added to the PICP system. Underdrains and geotextile are optional. PARTIAL INFILTRATION: Use Partial-Infiltration systems where the amount of water added to the PICP system exceeds the infiltration rate of the native soil and some degree of water storage is required. Include an under-drain and an outlet control device (see Page 16) to control the water storage depth in the sub-base.
YES
NO
YES
YES
NO INFILTRATION: Use No-Infiltration systems over very low permeability, swelling or contaminated soils, or where water harvesting is an objective. Include an under- drain and impermeable liner (on bottom and sides of the system).
NO
–
PIPC Pavement Design
ASCE 68-18 Permeable Interlocking Concrete Pavement was developed to provide design, construction and maintenance guidance for permeable interlocking concrete pavements to achieve storm water management goals while providing a structurally adequate pavement section to accommodate the anticipated vehicular loading in a cost efficient manner.
For copies of the ASCE Manual, or to receive a lunch and learn on the topic by one of its authors , contact Oaks staff.
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APPLICATIONS AND SOLUTIONS
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