Table
Anaerobic Lagoon Cost Data
0,194
0,065
of base cost
20 years
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.00831cubic feet
year
0,194
10% of base cost
years'
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.01cubic feet
year
Based on SCS cost data of
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.50 per cubic yard.
Although the SCS life expectancy for the practice is 20 years, calculations based on a 1 O-year value are
presented for comparison purposes.
Lagoon Effectiveness Relative to Typical Preexisting Conditions
As discussed earlier, the key to determining the effectiveness
animal waste
cost share monies is to know the preexisting animal waste `management practice
on a farm. The effectiveness of the cost-share monies is the difference between
the effectiveness of the enhanced, cost-shared practice and the pre-existing
practice.
the Tar-Pamfico basin, the Soil Conservation Service estimates that most farms
which receive lagoon cost-share funds typically have a lagoon which is undersized
Hansard, 1994). When
and/or not up to SCS technical design specifications
lagoons are undersized, the farmers must typically land apply their wastes at
levels greater than agronomic fates. Therefore, we have used land application at
greater than agronomic rates as the typical baseline condition for cost-shared
lagoons in the Tar-Pamlico basin.
After the lagoon is installed, the operator can begin to carry out a land application
program at agronomic rates.. Consequently, the pre-and post-bmp scenarios for
lagoon cost-sharing are effectively the same as
used in the analysis of land
application in Section 2.3.1
In Section 2.3.1.1, we estimated the reduction in
surface and subsurface load associated with switching from excess application (at
various rates) to land application at agronomic rates. These figures were
presented in Table 2-5. Because the pre- and post-BMP scenarios for land
application and lagoon cost- sharing are the same, the mass reduction estimates
in Table 2-5 also represent the nutrient reductions that can be expected from a
typical cost-shared lagoon in the Tar-Pamlico basin (via the change from
application of wastes to application at agronomic rates).
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