NaysDw2 is a solver in iRIC for tracking driftwoods using material tracking functions of UTT. The method used in NaysDw2 is the same as UTT which is the Lagrangian method of tracing materials. NaysDw2 also has a function of hitting and rotating materials to each other as the DEM method.

DHABSIM (Diversity based HABitat SIMulation) is an easy-to-use two-dimensional habitat calculator. It can calculate habitat condition of mid to small scale river without using HSI for specific fish species. It imports geometry, velocity, and depth from other flow calculation solvers, and outputs a habitat distribution map.

Nays1D+ is a one-dimensional solver for rivers with general cross-sectional shape. This solver can calculate flows by non-uniform steady flow model as well as unsteady flow model. The solver also calculate bed deformation considering bedload. The obstacles such as bridge pier and spur-dikes, inflow from tributaries can be also considered in the computaions. You can visualize the results using two-dimensional visualization window equiped in iRIC with the methods of color contour, vectors, particl trace, ets.

CERI1D is a solver for one-dimensional (1D) unsteady flow calculation. The calculation model was developed by Yasuhiro Yoshikawa of the Civil Engineering Research Institute for Cold Region (at Kitami Institute of Technology as of November 2012), and the model was improved to create a solver for iRIC by Takuya Inoue from the Institute and Michihiro Hamaki from Kaihatsu Koei Co., Ltd.

SAC can be used to compute peak flood discharges from measurements of high-water marks along a stream reach. The slope-area method used by the program is based on the U.S. Geological Survey (USGS) procedure presented in Techniques of Water Resources Investigations of the U.S. Geological Survey, book 3, chapter A2, "Measurement of Peak Discharge by the Slope-Area Method".

The basic equations of three-dimensional flow that incorporate the dynamic water pressure. This solver can simulate the fully three-dimensional flow phenomena, such as, the secondary current of the first kind, the horseshoe vortex around river structures, etc., and associated bed morphodynamic features. So, this solver can cover wider range of phenomena compared with 2D models, although it requires one-order (or more) larger CPU time. Therefore, this solver is suitable to be applied not on wide region of a river but on a limited portion for detailed analysis. The right figure shows an example for simulated the secondary flow of the first kind at a river bend.

Nays3Dv is 3Dimensional model developed for calculation of vertical and horizontal movement of fluid with density currents. The Nays3Dv solver is developed by Professor Yasuyuki Shimizu from Hokkaido University. Density currents occured due to density differences, arise from temperature variations, suspended solids or dissolved materials. Therefore, formation and evolution of density currents are induced by natural conditions such as saline intrusions, oil spills etc. Density flow is important for problems in lakes, reservoirs and estuaries.

In river engineering problems, the flow cannot always be approximated by two-dimensional models.

The Storage Routing Model (SRM) solver is a runoff calculation solver that uses storage routing models. The models had been developed by Dr. Kiyoshi Hoshi, former Director General of the Hokkaido Civil Engineering Institute (the current Civil Engineering Research Institute for Cold Region, Public Works Research Institute) and former Research Director of the Research Institute of the Foundation of Hokkaido River Disaster Prevention Research Center (the current River Center of Hokkaido). The model has been improved to apply to a solver for iRIC by Dr. Makoto Nakatsugawa of Muroran Institute of Technology, Dr. Tomohide Usutani of Japan Weather Association and Terumasa Nishihara of Civil Engineering Research Institute for cold region. The solver consists of two types of storage routing models: a synthetic storage routing model and a two-cascade storage routing model. The solver is equipped with two functions: One can calculate runoff amount from rainfall, while another can optimize parameters of the storage routing model. Using the iRIC GUI, you can calculate the runoff by applying rainfall data (or rainfall and discharge data) to this solver.

iRIC-ELIMO has been developed with a motto of ”simple and easy tsunami computation” for people with minimum knowledge to operate Window softwares, which is capable of reliable estimations of tsunami generation, propagation and evolution on coasts on easy-performable GUI environment provided by iRIC.

U.S. Geological Survey Culvert Analysis Program (CAP)