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 then please download the zip files below to access the excel sheets.


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

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

© - Riverside County Flood Control and Water Conservation District