Lesson 20: Sizing Considerations

Environmental Stewardship Assessment:

 
Name of Operation:
Date:

Existing Storage:

1. Is sufficient storage volume available until suitable land, climatic conditions, or labor/ equipment availability allows application?

Manure is often spread at an undesirable time of yr (frozen or snow-covered soil conditions) or at undesirable rates on any available land due to a full storage. Corresponding magnitude of risk
 
Manure is occasionally spread at an undesirable time of yr (frozen or snow-covered soil conditions) or at undesirable rates on any available land due to a full storage.
Sufficient volume exists to allow spreading of manure based on a plan for nutrient utilization that minimizes nutrient runoff.

New Storage:

2. Sizing procedure includes:

a. Sufficient storage volume for
< 3 months Corresponding magnitude of risk
 
3-6 months
6-11 months
At least 1 yr

b. Allowance for treatment volume (anaerobic lagoon only)?
Designed below ASAE, NRCS, or state standards for anaerobic lagoon treatment volume. Corresponding magnitude of risk
 
Designed according ASAE, NRCS, or state standards for anaerobic lagoon treatment volume.
Designed at double ASAE, NRCS, or state standards for anaerobic lagoon treatment volume.

c. Allowance for depth or freeboard (spillway included)?
None above maximum level for start pumping? Corresponding magnitude of risk
 
< 1 ft
1 ft
At least 1 ft

d. Allowance for depth above maximum level (freeboard) for start pumping (no spillway)?
None Corresponding magnitude of risk
 
1 ft (uncovered storage)
At least 1 ft + rainfall from 25-yr, 24-hr storm (uncovered storage) OR
At least 1 ft (covered storage)

e. Allowance for sludge (anaerobic lagoon) or solids accumulation in barn pits or storage basin)?
No Corresponding magnitude of risk
 
Yes

f. Allowance for storage of runoff from open lots, roof water, or other contributing drainage area?
None Corresponding magnitude of risk
 
Allowance for runoff < a 25-yr, 24-hr storm
Allowance for runoff from a 25-yr, 24-hr storm OR
Extended chronic wet period (wettest yr in 10 yrs)
No contributing drainage area OR
Allowance for runoff from a 25-yr, 24-hr storm AND
Chronic wet period (wettest yr in 10 yrs)

  Manure Storage Level Indicator:

3. Manure level is indicated by:

a. Start pumping marker
No Corresponding magnitude of risk
 
Yes but not clearly visible
Yes, marker is clearly visible

b. Stop pumping marker (for permanent pool (for treatment volume level) in lagoon and wet seal maintenance in earthen basin)?
No Corresponding magnitude of risk
 
Yes but not clearly visible
Yes, marker is clearly visible

c. Depth or "% of Full" marker?
No Corresponding magnitude of risk
 
Yes but not clearly visible
Yes, marker is clearly visible

 
Net Survey Score:
Magnitude of risk:

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