Storm Features

SUPPORTS ILLUDAS, RATIONAL AND EPA SWMM RUNOFF MODELS
The Illudas Time-Area method is used for the estimation of runoff from a uniformly distributed design storm. The results correspond satisfactorily with observed runoff events for the method to be an accurate and useful design tool.

The Rational Method is implemented as described in the National Transport Commission Road Drainage Manual, with an additional option to specify specific point rainfall for each subcatchment.

The EPA Storm Water Management Model (SWMM) is a dynamic rainfall-runoff simulation model used for single event or long-term (continuous) simulation of runoff quantity and quality from primarily urban areas. The runoff component of SWMM operates on a collection of subcatchment areas that receive precipitation and generate runoff and pollutant loads. The routing portion of SWMM transports this runoff through a system of pipes, channels, storage/treatment devices, pumps, and regulators. SWMM tracks the quantity and quality of runoff generated within each subcatchment, and the flow rate, flow depth, and quality of water in each pipe and channel during a simulation period comprised of multiple time steps.

SIMULATE DUAL RUNOFFS WITH PARTIAL FLOW CAPTURE AND OVERFLOWS
The dual runoff facility may be used to simulate the typical major and minor drainage system in the urban environment, ie. stormwater flowing in a road (major system) with only partial capture into the culvert (minor system) during large storms.

PROVISION FOR DETENTION STORAGE AT INLETS
If the incoming flow exceeds the capacity of the link and an overflow node is not specified, the excess flow will be taken into local or detention storage. As soon as the link is capable of conveying the overflow that is held in detention storage it is taken into the link and added onto the flow hydrograph.

The detention storage facility may be applied in two ways. Firstly, it can calculate the required storage volume and keep all the excess flow in detention storage. In the second instance the designer may specify the volume of available detention storage at a node. Should the calculated storage requirement be more than the available volume the excess flow will be diverted to an overflow node.

STANDARD AND USER DEFINED CULVERTS
The Link Tables allow the designer to define up to 15 different link types or culverts between nodes. These links may be circular (pipes), rectangular (box culverts), portal/skew haunch, or custom link types.

Custom link types allow you to input the depth to proportional flow and depth to proportional area curves, thus enabling the use of non-standard culvert shapes such as egg-shaped pipes, portal culverts or even parabolic channels.

GRAPHICALLY DEFINE CATCHMENT AREAS WITH ATTRIBUTES FROM DTM
This function allows you to create subcatchment runoff areas by defining the area graphically by drawing a polygon and giving it an identifying name. The program will save all the vertex coordinates together with the subcatchment name. The subcatchment can then be linked to a specific node of which the runoff area will be updated to the calculated size of the subcatchment. The drainage path can be indicated graphically and the drainage length and a weighted average slope will be calculated and entered into the Runoff time calculation. The subcatchment can also be displayed graphically by specifying the subcatchment settings in the Display settings.

Showcases & Testimonials

DEVELOPMENTS IN UNIONDALE "The great thing about projects of this nature is that you can rely on a program like Civil Designer to help you out" Andre Delport Vela VKE Engineers, Mosselbay GATEWAY TO BOOM TOWN "When you work with a program like Civil Designer it simplifies this task tremendously" Victor de Wet Arcus Gibb East London

ATTENUATE RUNOFF BY MEANS OF DETAILED RESERVOIR ROUTING
Attenuate runoffs by means of reservoir routing with full performance reporting. Reservoir results include a table of the water depth, inflow, outflow and storage for the duration of the runoff event as well as a graph of depth verse time indicating the full storage level.

HYDRAULIC ROUTING BY CONTINUITY EQUATION OR TIME SHIFT METHOD
You may select one of two routing methods for modeling the passage of flow hydrographs through the links, ie. Continuity or Time Shift routing. During the routing process a volumetric check is performed on the flow to ensure a high level of accuracy. The results of this check are displayed with the other analysis results.

ANALYZES FLOW, OVERFLOW, CAPACITY, VELOCITY AND FLOW DEPTH
The program will model a network consisting of both existing and new culverts. Any culverts which do not have a size, invert level and/or slope will automatically be designed according to the design parameters.

The program will simulate a complex system of detention storage, overflows and dual runoff thereby enabling you to model the intricate networks that are typical of modern cities.

Each model may have multiple sub networks and outfalls. You may specify the outfall levels if you wish to connect to existing systems. Alternatively, the program will determine the best possible outfall level in accordance with the design parameters.

The design is controlled by a number of parameters which are set by the user. This facility enables the design to be tailored to your own requirements or that of the local authorities or councils.

CALCULATES OPTIMAL CULVERT SIZE, SLOPE, INLET AND OUTLET LEVELS
The Storm Water Analysis will calculate the optimal network by designing according to the specified minimum cover, minimum and maximum flow velocities, minimum and maximum allowable link slopes and the available link sizes from the link tables.

SABS 1200 QUANTITIES WITH BEDDING MATERIAL/SELECTED BACKFILL
There are various default bedding classes included, any value may be changed, and the diagram will update to graphically show the changes. Clicking on the Default button will reset all the options back to the default SABS 1200 values for the specific bedding class.

CULVERT CLASH ANALYSIS WITH CROSSING SERVICES
This function checks for clashes between any two services such as sewer, storm, water, roads or other services defined in the pipe database. The Longitudinal Section dialog can be opened to display a long section of the chosen branch as well as a symbol indicating the crossing service.

GENERATES LAYOUT PLAN WITH PIPE SCHEDULE AND LONG SECTIONS
Production drawings such as plans with pipe schedules and long sections with title blocks and company logos etc can be created with no or little CAD editing. The layout of production drawings are completely customizable according to your specific company standards, Crossing services from the other modules can also automatically be displayed on long sections and cross sections.

THE SECOND BIGGEST DEVELOPMENT "The stormwater design was particularly tricky. One half of the estate had a flat terrain with poor drainage while the other half had steep slopes with deep valleys. Andre Botha, SSI, Port Elizabeth BIRDS EYE VIEW "Fortunately our engineers are standardized on Civil Designer and AllyCAD, so we could design around these zones quite easily" Stanley van den Heever Sintec Consulting Engineers Knysna

Read more testimonials and showcases here ⇒