Of course there is "urban" table, but it isn't enough since I try to model large city. Especially I have problem with green areas such parks, lawns, orchards and courts. BTW, in the table there is a field "urb cn" with value always 98 - does it force CN number in HRU?
If so, is it a good idea to split landuses on urban+grass, depending on %of impervious surface?
I've chosen swat+ because of its popularity, but maybe there is a better software for hydrological modelling of urban areas?
You can try stormwater maangement model (swmm) software. It is open access and it is robust and can be used for large and small cities or areas.
It depends on how you want to represent the urban. The urbca2 are the default values but if you have your own values you can change them in "SWAT2012" though the name might vary with the version. Usually default value is okay.
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