original_query: What are the key factors that a CAFO may use to identify the annual maximum rates of application of manure, litter, and process wastewater by field and crop for each year of permit coverage?
query: What are the key factors that a CAFO may use to identify the annual maximum rates of application of manure, litter, and process wastewater by field and crop for each year of permit coverage?
answer: A CAFO can use either a linear approach (expressing the rate in terms of nitrogen and phosphorus allowed) or a narrative rate approach (prescribing how to calculate the amount of manure, litter, and process wastewater allowed). The narrative approach offers more flexibility, allowing operators to adjust based on real-time data and changing conditions without needing permit revisions.