Table 12
Comparison Between Midwest and Florida Cost Ranges (1987 Dollars) for
Harvesting and Herbicide Treatments of Lakes and Reservoirs
Procedure
Cost Range (per hectare)
Harvesting
Midwest
Florida
Herbicides
Midwest
7-905
Florida
4-863
Note:
Based on data from
Livermore, and
1974, 1977; Culpepper
and Decell 1978; Dunst and Nichols 1979;
1979; Smith 1979;
Cannellos 1981; Sassic 1982;
1982;
et al. 1982;
Conyers and Cooke 1983; Sabol and
1984; Cooke et al. 1986; and
Thayer and Ramey 1986.
* Larger number refers to cost for dense waterhyacinth population.
** Larger number refers to cost for dense hydrilla population.
factors such as overhead, labor, transportation, and disposal, and most
investigators do not report costs at all so that data are scarce.
Further,
costs vary with the type of plant infestation.
For example, Thayer and Ramey
(1986) report a harvesting cost range for
to be
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,230 to ,900
-1
ha
but for waterhyacinth, the cost range is ,960
,531 ha
Good estimates of effort (manpower)', time, and cost of a proposed
mechanical harvesting operation can be obtained using the US Army Corps of
Engineers' computer model HARVEST (Sabol and
1984).
Input requirements
of the model are generally straightforward and easily measured or estimated.
Naturally, the more precise the input variables provided by the user, the more
precise the results will be.
Output includes estimated time and costs, given
specific machinery configurations, and density of vegetation growth.
Compared
actual operations performed, these time/cost estimates are accurate
enough to give a "best-case" estimate of the proposed effort to the planner.
The HARVEST program, which runs on a personal computer, can be obtained by
contacting the Program Manager, Aquatic Plant Control Research Program,
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