Hydraulic Design - Point Devices
For dimensioning and checking drainage and sewer networks
the following properties are required:
- Top Contribution (CTop, Double) - direct contribution to the structure
In Sewage Networks it could be the connection of a building. In Drainage Networks, the total contribution from another Catchment
- drainage
- Time of concentration (Tc, Double) - can be arbitrated when not calculated depending on the Catchment
- Coefficient of runoff (C, Double) - also called coefficient of impermeability (0 < C = 1)
If you have more than one area connected to the device, a weighted average will be calculated for each area
can be arbitrated when not calculated according to the Catchment
- System Time (TM, Double) - maximum concentration time for the structure, taking into account the top contribution
and the upstream branches
TM = Math.Max(Tc, TMamount + TP)
Where:
- TP - travel time inside the tube
- TUpstream - system time (TM) of the pipe upstream structure
- Recurrence Time (Tr, Double) - set in network properties of drainage
on Designing and network properties of drainage
on verification
- Precipitation (I, Double) - precipitation evaluated by the rainfall equation for the characteristics of this Catchment (I)
I = function (Rain Equation, Tr, TM)
- Fantoli coefficient (F, Double)
Where:
- C - Runoff coefficient
- I - Precipitation, depending on Tr and TM
- Inlet Flow (Qin, Double) - direct inlet flow into the upstream device, or the flow that enters from the top
QIN = Cr * C * F * Area * I
Where:
- F - Fantoli coefficient
- C - Runoff coefficient
- Cr - Retardation coefficient
- Area - Direct contribution area of the amount structure
To access these properties, use the Properties Tab, select the gravity point device and
click the icon:
to edit the dimensioning data
to edit the verification data