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RIST - Rainfall Intensity Summarization Tool

RIST - Rainfall Intensity Summarization Tool - 3.99.12

RIST (Rainfall Intensity Summarization Tool) is a Windows-based program designed to facilitate analysis of precipitation records.

RIST has improved efficiency and output files suitable for input to runoff, erosion, and water quality models including RUSLE, WEPP, SWAT, and AnnAGNPS. RIST inputs text files in user-specified fixed-width or comma-delimited formats. Rainfall records may be time-and-date stamp, fixed interval, or variable interval (breakpoint) data. Standard outputs include:

  • Standard RUSLE outputs include a storm-by-storm summary of total precipitation, duration, intensity, kinetic energy, and EI30; and bi-weekly and monthly rainfall summaries of rainfall, energy, EI30 and erosivity density.   Optionally, storms with less than 0.5 in. (12.7mm) of precipitation may be excluded from the energy and intensity calculations.
  • Standard WEPP outputs include daily rainfall, storm duration (reduced by excluding periods greater than 30 minutes without rain), ip, and tp.
  • Output for SWAT and AnnAGNPS include daily precipitation and, optionally, sub-daily precipitation totals.
  • RIST also includes the capability to generate (1) precipitation totals at any user-specified  fixed  time interval  or (2) a storm-by-storm analysis including maximum intensities observed during  5, 10, 15, 20, 30, and 60 minute within-in storm periods.


RIST 3.99.12 New, February 2023


AnnAGNPS - Annualized AGricultural NonPoint Source model

The Annualized Agricultural Non-Point Source Pollution Model (AnnAGNPS) is a continuous simulation watershed-scale program. The model is an expansion of the capabilities developed in the single event model AGNPS and is the pollutant loading model in the suite of models for the next generation of the suite of AGNPS modeling components. To use AnnAGNPS, the watershed is subdivided into homogenous land areas with respect to soil type, land use, land management, and climate. Areas can be of any shape including hydrologically-based or square grid (as was used in the single-event AGNPS). AnnAGNPS simulates quantities of surface water, sediment, nutrients, and pesticides leaving the land areas (cells) and their subsequent travel through the watershed. Some of the sediment, nutrients, and pesticides will reach the watershed outlet while the remainder will be deposited in the stream system. Calculations are done on a daily time step. Runoff quantities are based on runoff curve number while sheet & rill sediment is determined using RUSLE. Special components are included to handle concentrated sources of nutrients (feedlots and point sources), ephemeral gully sources, concentrated sediment sources (classical gullies), added water (irrigation), and the impacts of riparian buffers and wetlands. Output is expressed on an event basis for selected stream reaches and as source tracking (contribution to outlet or any other point in the watershed) from land or reach components over the simulation period.