Michigan Administrative Code
Department - Transportation
Bureau of Highway Development
Drainage Assessments
Section R. 280.8 - Pro rata share of runoff for county roads and state highways; computation examples

Universal Citation: MI Admin Code R. 280.8

Current through Vol. 24-04, March 15, 2024

Rule 8. The computations hereinafter set forth are included to clarify the method by which the pro rata share of runoff for county roads and state highways may be determined.

Formula: Q=ciA Q = runoff c = runoff coefficient i = rainfall intensity

A = area

Rainfall intensity is assumed to be constant throughout the drainage district, according to R 280.2(2), and since the apportionment is based on the pro rata share of the runoff, the rainfall intensity has been deleted from these computations.

(a) Computation No. 1:

Click Here To View Image

(b) Computation No. 2:

Click Here To View Image

(c) Utilities, railroads, or streets may also be subtracted from the total entitled "remaining lands," and computed on an equitable "c" factor at the discretion of the assessing authority.

Disclaimer: These regulations may not be the most recent version. Michigan may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.