Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 570 - DESIGN AND MAINTENANCE CRITERIA REGARDING RUNOFF FIELD APPLICATION SYSTEMS
Subpart B - DESIGN CRITERIA
Appendix A - Design Procedure Outlined

DESIGN PROCEDURE OUTLINED

1. Collect Site Specific Data

a. Types and Areas (sft) contributing drainage

b. Slope of Field Application Area (FAA) - Appendix D

c. Soil Infiltration Rate (SI) of FAA - Appendix C

2. Calculate Runoff Volume and Total Drainage Area

Working Table in Appendix B

3. Settling Basin Design

4.5 cft/100 sft of drainage area + 10% extra volume

Dimensions from Appendix I

4. Field Application Area Design

FAA = (VR x 12)/((2 x SI) - 1.69) (square feet)

Dimensions from Appendix E

5. Calculate Flow onto Field Application Area

Flows from Appendix G

or

Qf = (.0026) (FAA) (gpm)

6. Effluent Transport System Design

Recommended Designs from Appendix F

7. Junction Box Design

Recommended Design from Appendix H

8. Distribution Manifold Design

Recommended Designs from Appendix H