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The RR module includes a range of rainfall-runoff models
- NAM - A lumped, conceptual rainfall-runoff model simulating overland flow, interflow and baseflow as a function of the moisture content in each
of four mutually interrelated storages:
- Snow storage
- Surface storage
- Root zone storage
- Groundwater storage
- UHM - a unit hydrograph technique for single storm events and areas where no stream records exist
- SMAP - a monthly soil moisture accounting model
- FEH - UK Flood Estimation Handbook methodology
The RR module can either be applied independently or used to represent one or more contributing catchments that generate lateral inflows to a river
network. In this manner it is possible to treat a single catchment or a large river basin containing numerous catchments and a complex network of rivers and channels within the same modeling framework.
Efficient and Accurate Auto-Calibration Tool for NAM
An auto-calibration tool has been developed for the NAM model. In just a few minutes it does what an experienced hydrologist used to spend days on!
The user selects up to nine different NAM parameters to be included in the auto-calibration and sets allowed minimum and maximum values for each parameter, and the tool does the rest. The tool is based on
optimization of up to four objectives (water balance, overall hydrograph shape, peak flows and low flows). A global optimization routine called the Shuffled Complex Evolution (SCE) algorithm does the optimization.
It typically requires about 2000 model evaluations to reach a good calibration, and this is typically done in 1-2 CPU minutes.
Rainfall-Runoff Interface
The RR module provides the following interface facilities:
- Input and editing of rainfall-runoff data and computational parameters required for rainfall-runoff modeling
- Specification of rainfall/runoff time series. Time series are specified on the time-series page within the RR editor
- Calculation of weighted rainfall by use of a weighting of different rainfall stations in order to obtain representative catchment rainfall
- Digitizing of catchment boundaries and rainfall stations in a graphical display (Basin View) including automatic calculation of catchment areas
and mean area rainfall weights
- Presentation of Results. Specification of discharge stations used for calibration and presentation of results
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