in stormcad modeling, I wonder how can I design An open surface urban network that contains channels( or conduits) as main elements.In fact I need gutters to carry main flow and not just excess flow.
In general, gutters are only intended to model short runs of gutters between inlets/catch basins. If you are serious about modeling the surface network, you should use conduits than represent open or open channel links.
If this covers a large area such that rational method hydrology is not sufficient or have significant storage in ponds or depressions, then you should consider using a dynamic wave solver such as the solvers in CivilStorm. The peak flow solver in StormCAD does not account for flow attenuation over long distances. How large is the area you are modeling?
thank you so much for your help. Im working on A project which the related are is about 13000 ha. And I assume this is A big number!!!
my major problem is, more than half of the surface network is constructed and I need to consider them As existing conduits.and all of them are openflow channels( or conduits), like big gutters ( in shape of course)
It sounds as if you should be using a dynamic wave solver such as the explicit solver in CivilStorm or SewerGEMS.
Each of the network links can be modeled as Conduits with a Section Type corresponding to an open channel or a Channel element with the cross section described at the end points of each channel link.
Assuming this gutter network carries all the runoff and there are no inlets/subsurface piping - if you use conduits to model the gutters, you can use the transition element between conduits to model the change in slope or shape. The cross sectional shape of the conduit is assumed to be constant/prismatic.
Another option is to use channels and cross sections. With this, the cross sectional area is defined at the cross section node. With the Implicit dynamic solver in SewerGEMS and CivilStorm, channels are treated as non-prismatic.
See related articles from our Wiki:
Conduit vs. Channel
Are Channels prismatic or non-prismatic?
Cross section vs Transition for modeling slope or size change
Jesse DringoliTechnical Support Manager, Haestad ProductsBentley Communities Site AdministratorBentley Systems, Inc.