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Minnesota Stormwater Manual

Percent P Removed Via Non-Volume Reduction Treatment
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Percent P Removed Via Non-Volume Reduction Treatment
Link to this table

Particulate P Dissolved P
Current Proposed Current Proposed
No underdrain 0% 0% 0% 0%
Elevated underdrain 45% Is soil P content tested to be < 36 mg/kg per Mehlich III test?

If yes, 40 % If no, 0%

0% Is soil P content tested to be < 36 mg/kg per Mehlich III test?
  • If no, 0%
  • If yes, is there at least 2 feet of soil above the elevated underdrain? If yes, 20% credit,
  • If no, credit = 0.2*x
Where x = (soil depth above elevated underdrain) /2 feet
  • Additional credit for approved P-sorbing soil amendments = 40 percent if one of the following conditions aapplies.
    • 5% by volume elemental iron filings above IWS or elevated underdrain
    • Minimum 5% by volume sorptive media above IWS or elevated underdrain
    • Minimum 5% by weight water treatment residuals (WTR) to a depth of at least 10 cm (1/3 foot)
    • Other P sorptive amendments with supporting third party research results showing P reduction for at least 20 year lifespan, P credit commensurate with research results
Underdrain at the bottom 91% Is soil P content tested to be < 36 mg/kg per Mehlich III test?
  • If yes, 40 %
  • If no, 0%
  • Additional credit for approved P-sorbing soil amendments = 40 percent if one of the following conditions applies.
    • 5% by volume elemental iron filings above IWS or elevated underdrain
    • Minimum 5% by volume sorptive media above IWS or elevated underdrain
    • Minimum 5% by weight water treatment residuals (WTR) to a depth of at least 10 cm (1/3 foot)
    • Other P sorptive amendments with supporting third party research results showing P reduction for at least 20 year lifespan, P credit commensurate with research results
 0% Is soil P content tested to be < 36 mg/kg per Mehlich III test?

If yes, 20 % If no, 0% Does the system include approved P-sorbing soil amendments*? For iron enhanced soils, Imbrium or WTRs, additional 40% credit

Internal Water Storage (IWS) Is soil P content tested to be < 36 mg/kg per Mehlich III test?

If yes, 40 % If no, 0%

Is soil P content tested to be < 36 mg/kg per Mehlich III test?

If yes, 20 % If no, 0% Does the system include approved P-sorbing soil amendments*? For iron enhanced soils, Imbrium or WTRs, additional 40% credit

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