> For the complete documentation index, see [llms.txt](https://hydrosense.gitbook.io/ildas/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hydrosense.gitbook.io/ildas/technical/hydrodynamic-models.md).

# Hydrodynamic Models

## MizuRoute:

MizuRoute is a vector-based routing model that simulates regionally dispersed streamflow by utilizing runoff supplied by land models or hydrological models. There are two steps involved in routing:

1. A unit hydrograph based on gamma distribution is used to route basin runoff from the hillslopes to the river reach.
2. The water is routed downstream through the river channel network using either an Impulse Response Function (IRF), Diffusive Wave (DW), or a Kinematic Wave Tracking (KWT) routing scheme. 

In standalone, MizuRoute internally remaps the gridded runoff supplied by the hydrological or land model to the basin specified in the vector-based river.

## HyMAP:

HyMAP is a global hydrodynamic routing model that is designed specifically to be able to couple with Land Surface Models. It uses the local inertia approximation of shallow water equations to simulate surface water dynamics in rivers and floodplains. It intakes base flow and surface runoff from the Land Surface Model outputs at each modeling time step. 

HyMAP comprises four modules that account for: 

1. The surface runoff and groundwater baseflow time delay where it introduces a time delay factor. 
2. A river floodplain interface. 
3. River channel and floodplain flow routing.
4. Evaporation from the open water surface.