MIDUSS provides many Hydrology and
Design features. Below is a short summary. MIDUSS
provides a blend of Simulation and Design features
intended to help you be more efficient in producing effective
designs. [ Learn more ]
STORM: You can define
a rainfall hyetograph either of the synthetic, design type or
a historic storm. Choose from five types of storms.
CATCHMENT: You can define
a subcatchment and compute the total overland flow
hydrograph for the currently defined storm. Runoff hydrographs
from the pervious and impervious areas are computed separately
and summed. There are 4 alternative methods for routing the
overland flow and 3 different models for estimating
infiltration and rainfall losses.
LAG and ROUTE: This
feature is a useful for
modelling the runoff from very large subcatchments without
having to resort to specifying unrealistically long overland
BASE FLOW: This
allows you specify
a constant value of base flow to be added to the
current inflow hydrograph.
IUH HYDROGRAPH: This lets you define a hydrograph
based on a peak flow value and time to peak applied to an
Instantaneous Unit Hydrograph.
PIPES: With this
feature you can design a pipe to
carry the peak flow. MIDUSS carries out a uniform flow
analysis and reports the actual depth and velocity and also
the critical depth.
CHANNELS: You can design channels
with a general trapezoidal shape defined or your design shape
defined by up to 50 pairs of coordinates. Feasible designs are
presented. MIDUSS carries out a uniform flow analysis for
the given flow, roughness and geometry and reports the depth
of flow, the average velocity and the critical depth in the
ROUTING: You can route the Inflow hydrograph
through a reach of specified length to obtain the Outflow
hydrograph at the downstream end. MIDUSS checks that the
time step and reach length are acceptable to ensure stability
in the routing process.
DETENTION POND: You can design a detention pond to
achieve a desired reduction in the peak flow of a hydrograph.
Specify the desired peak outflow and MIDUSS will estimate the
maximum storage requirement to achieve this. Storage routing
assistance is provided. The outflow control can be designed
using multiple orifices and weir controls. The Stage -
Storage values can be estimated for different types of storage
facility. These may be a multi-stage pond with:
- an idealized rectangular plan shape and different side
slopes in each stage;
- one or more "super-pipes" or oversized storm sewers;
- wedge storage formed on graded parking lots; or
- a combination of these types of storage.
Rooftop storage can also be modelled to simulate controlled
flow from the roof of a commercial development.
EXFILTRATION TRENCH: This feature lets you proportion an
exfiltration trench to provide underground storage for flow
peak attenuation and also to promote return of runoff to the
DIVERSION DEVICE: With this feature the inflow hydrograph
split into two separate components, the outflow hydrograph and
the diverted flow hydrograph. You can specify the diverted
fraction or you can define this implicitly by specifying the
desired peak outflow and MIDUSS will then work out the
necessary fraction to be diverted.
CULVERT: You can design a culverts of various shapes
and then route the flow. An embankment weir can be
designed. Profile and cross plots are provided in real time as
you design. Upstream channel design can precede the
culvert design to add detailed upstream storage analysis.
CASCADE: You can design two cascading cells of
super-pipes. A variety of commercial shapes are
provided. Surcharging conditions are highlighted.
Layout provides a visual display of the elements added to the
drainage network. The procedure is carried out automatically;
Catchments, Pipes, Channels and other stormwater control
devices are drawn on the Layout as they are designed.
You can move the network around to match your actual real life
design. Hovering over the drainage elements provides
popup design and performance data.
You can add a background image that matches the topology or
IDF Curve Fit: Computes Chicago storm parameters
‘a’, ‘b’ & ‘c’ for observed data.
Time of Concentration: Estimates the time of
concentration at various locations in the drainage network.
Roughness Height: Converts roughness element
height to a Manning ‘n’ value.
Edit Storm: Lets you modify an existing Mass
Rainfall Curves file or create a new one.