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Step 1 - Calculate Storage Needed Input numbers - Yellow
boxesOutput numbers - Orange boxesFinal answer - Green box
Number of days
needed for storage Average flow
days times MGD equals MG divided by 0.326 MG/acre-ft equals
Step 2 - Calculate Storage Available
Actual depth
Pond 1 ft minus ft equals times acres equals
Pond 2 ft minus ft equals times acres equals
Pond 3 ft minus ft equals times acres equals
Pond 4 ft minus ft equals times acres equals
=
Step 3 - Calculate Total Volume Needed to Discharge
Total volume neededStorage needed (step 1) Storage available
(step 2) to sc arge see note
acre-feet acre-feet acre-feet
Step 4 - Calculate Total Feet Needed to DischargeTotal feet
needed
Total volume needed Size of pond being to discharge (see note)to
discharge (step 3) discharged from
acre-feet divide by acres
** Note: Assume rainfall = Seepage + Evaporation
minus equals
Total storage available
Storage ava
Total flow Storage nee
Date calculated:
Pond size
equals
Pond Discharge Calculation WorkWastewater Permit
Doc Type:
Max depth
wq-wwtp7-30 7/5/12 www.pca.state.mn.us 651-296-6300 800-657-3864
TTY 651-282-5332 or 800-657-3864 Available in alternative formats
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This form is provided as an aid for the stabilization pond
operator to calculate the amount of treated wastewater to discharge
in
order to provide the approximate storage needed for the upcoming
summer or winter time period. The assumption used in this
calculation is that rainfall will equal pond seepage plus pond
evaporation. The form has been created to be used electronically.
After
you enter your numbers in the 'yellow' form field boxes, the
'orange' and 'green' form field boxes will automatically be
populated
with the calculations. The form is not required to be submitted
to the Minnesota Pollution Conrol Agency. However, you are
required to keep this form for a period of three years as a
record of your pond discharge calculations.
Instructions Pond Discharge Calculation Worksheet
wq-wwtp7-30 7/5/12 www.pca.state.mn.us 651-296-6300 800-657-3864
TTY 651-282-5332 or 800-657-3864 Available in alternative formats
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