Riverside County Design Handbook for
Low Impact Development Best Management Practices

The Design Handbook for Low Impact Development Best Management Practices (aka. LID BMP Design Handbook) was developed by the Riverside County Flood Control and Water Conservation District, for use on development projects in Riverside County, in conjunction with the Riverside County Water Quality Management Plans (WQMPs) for the Santa Ana, Santa Margarita, and Whitewater River watersheds.

This manual provides design and maintenance guidance for seven BMPs, however before selecting particular BMPs for use on your site, it is important to consult the WQMP applicable to your project, based on the watershed permit area it is located within. If you are unsure which WQMP to use, consult the local municipality.

Please note this handbook utilizes Microsoft Excel worksheets to aid in calculating VBMP and QBMP, and for designing and documenting your design for each BMP. The PDF files linked below include the excel files as embedded attachments. If your version of acrobat does not support attachments, download the zip files below to access the excel sheets.


LID BMP Design Handbook   11.6MB   11.4MB (entire handbook)  
Main Body   (Sections 1.0 through 3.0)
Individual BMP Downloads:
3.1 Infiltration Basin    
3.2 Infiltration Trench    
3.3 Permeable Pavement    
3.4 Harvest and Use    
3.5 Bioretention Facilities    
3.6 Extended Detention Basins    
3.7 Sand Filter Basins    
Appendix A   (Infiltration Testing Guidelines)
Appendix B   (Underdrains Guidelines)
Appendix C   (Basin Guidelines)
Appendix D   (Isohyetal Map for the Santa Ana and Santa Margarita Watersheds)
Appendix E   (Pollutant Removal Effectiveness Table)
Appendix F   (Worksheets for Calculating Vbmp and Qbmp)


*The Isohyetal Map included in Appendix D of this handbook cannot be used in
conjunction with BMP designs provided in prior BMP handbooks.