comparison of run off hydro-graphs

Question

Greetings, 
 generally speaking, how would a run off hydrograph generated in CivilStorm for a given catchment using the SCS unit hydrograph method compare to a hydrograph generated in Open Flows Flood by running a precip on grid simulation for the same catchment. 
 
 Thanks

Douglas Miranda · Answer

Hello, 
 once running a storm event in OpenFlows FLOOD, the catchment areas, that you need to delineate in CivilStorm for each inflow node, is not an required input to determine the contribution area, since the Digital Surface model together with 2D calculation (Saint-Venant and Manning-Strickler equations) will do it. Same happens with Time of Concentration input, that is also taken by the surface&acute;s conditions, while in CivilStorm is another user input. 
 Another situation that can happens while applying the 2D calculation is when you have depressions that causes water ponding, something that you need to enter in CivilStorm explicitly, while in 2D calculation it&acute;s seen as a result. 
 I believe this topics above bring the differences regarding the runoff calculation in CivilStorm and OpenFlows FLOOD. 
 Hope that helps. 
 regards, 
 Douglas MIranda.

Douglas Miranda · Answer

You can enter information regarding the soil permeability (fraction number) that can be a unique value for all basin or based in a grid file to determine where infiltration is higher and where is lower. 
 About surface depressions, if they are not welcomed in the modeling, OpenFlows FLOOD has tools to remove it.

Yashodhan Joshi · Answer

Hello, 
 The responses to this thread and additional information are now documented in the following wiki article; 
 Runoff Comparison between CivilStorm / SewerGEMS and OpenFlows FLOOD 
 Hope this helps.

comparison of run off hydro-graphs

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