Oskaloosa Conservation Design Credit for Reducing Impervious Area

Code of Ordinances 8.28.060 recognizes that the reduction in stormwater runoff related to certain conservation design practices. Conservation design credit that reduce impervious area can receive a reduction stormwater utilities service charges. The maximum credit provided for any impervious area is the largest credit of applicable individual conservation design practices and a cumulative reduction is not allowed. The reduction of the impervious area of facilities subject to conservation design practices is:
1. Green roof design 65% reduction
2. Porous pavement 50% reduction*
3. Rain gardens, bioswales and similar facilities 50% reduction

*The reduction for porous pavement shall be valid for a period of five years. The city will inspect the porous pavement every five years and determine if the porous pavement continues to maintain the high porosity associated with porous pavement design. If the high porosity continues, the credit will be renewed for a period of five years. If the porosity has been decreased due to plugging or fouling, the credit will not be renewed.