| Popis: |
A feedlot database was used to evaluate the Concentrated Animal Feeding Operations (CAFOs). The database included 478 feedlots in 318 livestock operations. ArcVIEW GIS software was used to import the database into a digital environment; then spatial evaluations were conducted.The database and evaluation results include the distance to major aquifers and surface waters, operations having more than 200 animal units (AU), soil type, optimum slope, aspect, and finally, runoff flowpath. The following step was to create a GIS database that can be browsed on the Internet. HTML ImageMapper 8.3 extension was used to achieve this goal. Finally, the feedlot hydrology/nutrient transport model was provided in a spreadsheet program that can be used through the Internet.Evaluation of NDHD data showed that the number of operations in North Dakota having more than 200 AUs is 124. That means 39 % of the operations have enough animals to be considered as CAFO. The average AUs for those operations is 619. Among 318 livestock operations, 35 of them are located within 0.60 m per animal unit of waters of the state. There were 256 operations not located on the optimum slope ranges of 2-6 %, and 208 operations were not located properly as far as the aspect is concerned. The number of operations that are not located a safe distance from the major aquifers was 122. Among 487 feedlots, 333 of them are located on fine-textured soils, which have higher runoff capacities. |
