Knowledge Base Software Storm NETWORK ANALYSIS & DESIGN PROGRAM Stormwater is a comprehensive tool for the network analysis and design program for runoff events. It will calculate catchment runoff, culvert flows, overflows, and routing and detention storage through user-defined ponds. It also calculates culvert sizes, invert levels and slopes and supports the Illudus, Rational and SWMM runoff models. The program will model a network consisting of both existing and new culverts. Any culverts that do not have a size, invert level and/or slope will automatically be designed according to the design parameters. The design is controlled by a number of parameters that 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. Storm also supports interactive drawing functionality in order to create and edit networks quickly and easily.

Supports Illudas, Rational and EPA SWMM runoff models Simulate dual runoffs with partial flow capture and overflows Provision for detention storage at inlets Hydraulic routing by continuity equation or time shift method Attenuate runoff by means of detailed reservoir routing Analyzes flow, overflow, capacity, velocity and flow depth Calculates optimal culvert size, slope, inlet and outlet levels Standard and user defined culverts Graphical functions Graphically define catchment areas with attributes from DTM SABS 1200 quantities with bedding material/selected backfill Culvert clash analysis with crossing services Pump stations with up to 4 pumps with various controls Generates layout plan with pipe schedule and long sections Bitmaps and cadastral backdrops Fully compatibility with DWG and other formats

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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.

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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 i.e. stormwater flowing in a road (major system) with only partial capture into the culvert (minor system) during large storms.

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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.

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HYDRAULIC ROUTING BY CONTINUITY EQUATION OR TIME SHIFT METHOD You may select one of two routing methods for modelling the passage of flow hydrographs through the links, i.e. 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.

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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.

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ANALYZES FLOW, OVERFLOW, CAPACITY, VELOCITY AND FLOW DEPTH 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.

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

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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.

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GRAPHICAL FUNCTIONS Storm catchment areas, manholes and culverts can defined and modified graphically. These 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.

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GRAPHICALLY DEFINE CATCHMENT AREAS WITH ATTRIBUTES FROM DTM This function allows you to create 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.

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SABS 1200 QUANTITIES WITH BEDDING MATERIAL/SELECTED BACKFILL Culvert trench quantities are calculated according to SABS 1200 with user-defined depth increments. Quantities include excavation lengths, excavation volumes with extra over for intermediate and hard material, culvert lengths, bedding material volume and selected backfill volume. The ground profile is automatically extracted from the supporting digital terrain model.

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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 crossing services. Problem areas are displayed on the layout drawing and the longitudinal section window can be opened to display a long section of the chosen branch as well as the crossing services. You may then adjust the invert levels and slopes of the affected culverts.

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PUMP STATIONS WITH UP TO 4 PUMPS WITH VARIOUS CONTROLS Pump stations can contain up to 4 pumps with different characteristics and separate sets 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.

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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 is 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.

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

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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. 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.