University of Illinois Extension

Quiz

Practice Problems: Sizing Residential Subsurface Seepage Systems 4

Sizing of subsurface seepage systems is done by applying the soil loading rate to the average daily flow, or the number of bedrooms for residential settings.

The soil loading rate can be calculated by using either a percolation (perc) test or a soil evaluation.  The procedure for conducting percolation tests is found in section 905, Appendix A, Illustration G of the administrative code.

Information on using soil evaluations and loading rates is found in Section 905, Appendix A, Illustration M

Information on calculations for gravel trenches is found in Appendix A, Illustration H, Exhibit A.  Exhibit B is used for gravelless pipe.

Residential Practice problems.

A 4 bedroom house has a soil evaluation of soil group 4C from 0 to 24 inches, 5D from 24 to 46 inches, and 5E from 46 to greater than 60 inches.
  1. Practice Problems: Sizing Residential Subsurface Seepage Systems 4

    How many linear feet of 24 inch gravel trench would be required?

    feet
  2. Practice Problems: Sizing Residential Subsurface Seepage Systems 4

    How many linear feet of 10 inch gravelless pipe would be required?

    feet
  3. Practice Problems: Sizing Residential Subsurface Seepage Systems 4

    How many linear feet of 18 inch chamber would be required?

    feet