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MIDUSS Features

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 ]

Hydrology Summary     [ More detail ]

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 flow lengths.

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.


Design Summary     [ More detail ]

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 channel.

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 groundwater.

DIVERSION DEVICE:  With this feature the inflow hydrograph can be 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     [ More detail ]

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 lotting fabric.


Tools    [ More detail ]

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.















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Design makes
the difference
Latest Update:
v2.25 Rev468
March 6, 2009
On-line videos

There are 25 Flash videos available to help you use MIDUSS.  Click here.

Quick Story

How about a quick MIDUSS review in 180 seconds or less? We know your time is valuable. Click here for the fast story.

College or University faculty?

Please see our academic page for our low price offer.  Click here.

MIDUSS Automatic Mode Problems?

Recent Windows XP and 2000 updates have caused some MIDUSS 98 and Version 2 installations to fail in Auto mode.  If you are experiencing this problem click here.

Theory anyone?

If you are interested in the hydrological or hydraulic theory built into MIDUSS click here.

What do MIDUSS users say

View the results of our May 2004 User survey.  No marketing fluff, just the facts.  Click here.

You have a custom version of MIDUSS distributed through Winz Connections.
Find out more informaion about the custom Malaysia storms.  Click here.









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