The user defines the size and characteristics of each area being evaluated, based on the total acreage of each land-use entered into STEPL. There is no functional difference in the way STEPL calculates loads when watersheds or fields are used. For instance, if a user needs to estimate the load reductions from BMPs on individual farm fields, the “watersheds” can be further defined as “Field 1”, “Field 2”, “Field 3”, etc. Although the terminology used throughout STEPL to define land use areas is “watershed,” these same input fields can also be treated as smaller areas, such as a project area or individual agricultural fields. STEPL can be used to evaluate loading and load reductions at a variety of scales. sediment delivery based on various land uses and management practices.It usually reflects the amount of oxygen consumed in five days by biological processes breaking down organic waste. nutrient loads, including nitrogen, phosphorus, and 5-day biological oxygen demand biological oxygen demandAn indirect measure of the concentration of biologically degradable material present in organic wastes.
STEPL provides a user-friendly Visual Basic (VB) interface to create a customized spreadsheet-based model in Microsoft (MS) Excel.
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