Davenport Permeable Pavement and Pavers Permitted Uses

Municipal code 17.02.040 Rules of Measurement for Impervious Surface Coverage.
H. 2. When pervious paving is used, it is calculated at a reduced percentage of impervious coverage, as follows:
a. Pervious concrete and open grid paving systems are calculated as 50% impervious surface, provided that no barrier to infiltration is installed beneath the material. Open grid pavers must be installed on a sand base, without an impervious liner, to qualify.
b. Other types of pervious surfaces, such as permeable pavers, porous asphalt, or gravel-crete, are credited based upon field performance data and coefficients of permeability provided by the manufacturer.

Municipal code 17.10.030 Off-Street Parking Design Standards
C. Surfacing. All off-street parking lots must be improved with a hard surfaced, all-weather dustless material; pervious paving is encouraged and may also be used. Gravel is prohibited. Sealcoating and roto milling (the process of removing at least part of the surface of a paved area) is prohibited.