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Surface flow – catchment/watershed modeling – hydraulics

  • Storm-water management
  • Urban drainage storm runoff control and retention design
  • Flooding and pollution prediction under complex urban and river interaction
  • Catchment yield factors and resulting runoff rates are calculated for each parcel of land
  • Water can be transported on the surface (2-D equations) as well as directly discharged into the sewer system
  • Bi-directional coupling of sanitary, storm and combined sewer systems with surface models: modeling of above- and belowground elements of catchments in an integrated fashion.

++SYSTEMS lets the user create models that seamlessly integrate sanitary, storm and combined sewer systems (1-D flow equations) with surface flow (2-D flow equations) and flowing bodies of water (1-D flow equation) to provide a combined and holistic view of urban drainage.

2-D surface flow is calculated with the ++SYSTEMS-component "GeoCPM", using the same fast, accurate and stable numerical solution scheme ("complex parallel step method", CPM), developed in-house at tandler.com, as is employed for 1-D flow in sewer systems and watercourses.

This allows operators not only to design and verify sufficient road and highway drainage, but also to more accurately identify surface run-off pathways, flood risks, evaluate potential damage, and propose suitable mitigation measures for a multitude of operational scenarios and load situations (single event / long term rainfall data etc.). Such mitigation measures can be as elaborate as whole urban catchment strategies including separate storm sewers, extra volume storage provided by intentional flooding of suitable parcels of land, and active control strategies – all conceived, evaluated, and planned in ++SYSTEMS!

Together with the ++SYSTEMS hydraulic modeling functionality for flowing bodies of water and included reactive-transport modeling of chemical substances , holistic flowing watercourse, sewage system and drainage master plans can be devised. Such master plans can include amongst others the implementation of sustainable urban drainage systems (SUDS), the design of appropriate retention volumes, and the verification of the system’s ability to handle future scenarios in terms of demography and climate change.