Sewer Features

UNIT FLOW CLASSES, HARMON FORMULA OR HYDROGRAPH INFLOWS
The Sewer module supports three inflow calculation methods: Unit Flow, Harmon, and Hydrograph. The Unit Flow method is an empirical method that assigns an inflow class to each type of contributing unit. The number of contributing units of each class is specified at each node. The Sewer module calculates the peak design inflow from the information in the Unit Flow Class table.

The Inflow Hydrograph method uses unit inflow hydrographs to determine the flow in the network over a period of time. The inflow hydrographs may be input with any time increment.

CALCULATES ATTENUATION ACCORDING TO POPULATION
The Sewer module calculates the peak design inflow from the information in the Unit Flow Class table according to a specific formula.

The result will be an inflow in liters per second which is representative of all the contributing units at that node.

During the network analysis the program will keep a total of all the units of each inflow class. At each node in the network it will calculate the total design flow as well as the total contributing population.

The design flow is attenuated according to the attenuation curve for the total contributing population at that point.

DYNAMIC TIME SIMULATION WITH MULTIPLE INFLOW HYDROGRAPHS
The Inflow Hydrograph method uses unit inflow hydrographs to determine the flow in the network over a period of time. The inflow hydrographs may be input with any time increment. Up to 10 hydrographs can be displayed on a common set of axes. It is extremely useful to see how various flows interact with each other.

INFILTRATION BY PERCENTAGE FLOW OR BY LENGTH OF CULVERT
The infiltration defines the extra inflow due to stormwater infiltration into the sewer network as either a percentage of the sewer flow or a fixed inflow value per kilometer of sewer pipe.

PUMP STATIONS WITH UP TO 4 PUMPS WITH VARIOUS CONTROLS
Pump stations can contain up to 4 pumps, possibly of different characteristics, each of them with a separate set of control levels. The pump control levels work in combination with the pump station sump for which a depth-storage curve and initial depth must be defined.

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.

CULVERT HYDRAULICS USING PROPORTIONAL FLOW DEPTH
Culvert sizes are automatically adjusted according to specified flow depth. The maximum flow depth that will be allowed in the links is usually set to 80%.

ANALYZES FLOW, OVERFLOW, CAPACITY, VELOCITY AND FLOW DEPTH
The Sewer Analysis and Design module is a complete tool for the design of foul water or sewerage networks. It will calculate the invert levels, slopes and diameters of the culverts as well as the design flow, capacity and the flow velocity of each culvert.

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.

In most cases multiple inflows may be specified at each node. Inflows may be user-defined in the inflow parameters tables.

The program will simulate a complex system of local storage (surge tanks) and overflows 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 Guidelines for the Provision of Engineering Services in Residential Townships published by the Department of Community Development have been followed in the calculation of unit flows. In addition the design flows may also be calculated according to the Harmon formula or using unit inflow hydrographs.

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.

Showcases & Testimonials

MEETING CAPE TOWN'S HOUSING NEEDS "We used the as-built information together with GIS data of the total catchment area to create a model with the use of interactive design package, Civil Designer" Adrian Coetzee, KV3 Engineers, Belville

GATEWAY TO BOOM TOWN "When you work with a program like Civil Designer it simplifies this task tremendously. You can create a virtual model of what is on site so that you get an accurate picture of what the obstacles are" Victor de Wet, Arcus Gibb, East London

CALCULATES OPTIMAL CULVERT SIZE, SLOPE, INLET AND OUTLET LEVELS
The Sewer 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.

FULL ERF CONNECTION DRAINAGE ANALYSIS USING MINIMUM ERF LEVEL
The Sewer module now includes erf connection functionality. Users can now graphically insert erf connections using the familiar Sewer user interface while the program automatically indicates the lowest point on each erf. The erf connection database can then be analyzed to report results and warn the user where erf connections are unable to drain to the main line.

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.

CALCULATES INFLOWS WITH ATTENUATION AT EVERY MANHOLE WITH DYNAMIC TIME SIMULATION
The dynamic time simulation (unit inflow hydrographs) allows you to view the flow hydrographs of single or multiple culverts in order to gain an insight into the dynamics of the system.

DESIGN TAKES INTO ACCOUNT THE HYDRAULIC AND GEOMETRIC RELATIONSHIP BETWEEN THE DIFFERENT BRANCHES IN THE NETWORK
The design will take into account the hydraulic and geometric relationship between the different branches in the network. Attenuation is calculated at every manhole resulting in a solution, which is 30% to 100% more cost-effective than simply adding the inflow peaks together.

BITMAPS AND CADASTRAL BACKDROPS
View the network with a bitmap or cadastral backdrop. Or display the site contours and slope shading to decide on optimum network layout.

GRAPHICAL FUNCTIONS
The graphical functions allow you to easily insert nodes and links, make changes to an existing layout by moving a node, change the flow direction or query a node or link with a click of the mouse.

GENERATE CONSTRUCTION DRAWINGS
Thereafter you can generate construction drawings such as layout plans and long sections or calculate quantities. The ground profile is automatically extracted from the supporting digital terrain model.

FULLY COMPATIBILITY WITH DWG AND OTHER FORMATS
Knowledge Base is a founder member of the Open Design Alliance and, as such, our inside knowledge of the DWG drawing structure ensures high compatibility when loading and saving DWG and DXF drawing formats, including Paper Spaces. In addition we also support loading of Caddie CEX, Arcview SHP, Microstation DGN and Ultimate CAD UCX files. This gives you unprecedented flexibility to move between drawings without having to worry about incompatibilities and data exchange problems.

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.

BULK WATER SERVICES "It was in evaluating which options would provide the client with the best solution, that the power and ease of Civil Designer was fully appreciated." Johann du Preez, FST Consulting Engineers East London

SANITATION & WATER SERVICE DELIVERY Designs were detailed on Civil Designer which has become an internal standard within Kwezi V3's branches. "The programme is used extensively and has been instrumental on this project." Alphons van der Merwe, Kwezi V3 Engineers, Bloemfontein

Read more testimonials and showcases here ⇒