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ICPI revises permeable design program with CAD output

Updated from a charter 2008 version and available in a free trial, Permeable Design Pro Software v2.0 for permeable interlocking concrete pavement (PICP) generates time-saving cross section drawings 21-NS-ICPI-300with base and subbase thicknesses, plus CAD drawings illustrating calculated hydrologic and structural requirements from user-designated rainfall events, runoff flows from contiguous surfaces, traffic loads, underdrains and soil subgrade characterizations.

The Interlocking Concrete Pavement Institute program enables users to quickly evaluate PICP solutions for stormwater management in pedestrian area, parking lot, alley and street conditions. Upon calculating the subbase thickness for water storage and anticipated traffic loads, it automatically selects the thicker of two subbase thickness solutions and presents the PICP cross section as a CAD drawing. Based on user inputs, drawing outputs can include an underdrain, geotextile and impermeable liner if no infiltration into the soil subgrade is desired. The cross section drawing also specifies underdrain outlet height as determined by the user to detain water for infiltration. Users can also directly modify the drawing cross section output from within the program, changing such items as subbase thickness, underdrain pipe diameter, geotextile presence or absence, and an impermeable liner.

Other program modifications include the minimum surface infiltration required for designs now set at 100 in./hour. PICP has substantially higher initial surface infiltration rates, but this value is used as a starting point to facilitate intake of all rainfall and runoff from adjacent surfaces into low or no slope installations.

The new software version can now be downloaded from www.permeabledesignpro.com for a 30-day free trial; users can then purchase a license key to register and activate the software for ongoing work. The program is available to ICPI members and design professionals for $95/single user license or $75/license for three or more users; nonmembers, $190/single user license.