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Hello all, I am in the process of doing storm calcs for a relatively small site that is mostly developed (85-90% impervious). The site is a redevelop and I am trying to determine the best way to determine my pre-develoepd runoff rates. I am using the rational method. The redevelopment consists...

Thanks for all the responses. I'll check it out. I might just create a spreadsheet to get my HGLs. Were running civil 3d and I know Autodesk bought hydraflow, which they are providing for free as an extension to subscription customers so I'm gonna try that route, the problem is by the time I...

Hello, Does anyone know of a free storm sewer program with a graphical user interface available for download? Something similar to hydraflow? I used to use Hydraflow but have switched jobs and was given Qhec-12. Any suggestions would be greatly appreciated. Thanks

Hello all, Please help I am struggling with a water distribution model that says I am okay with kypipe but when I do it by hand I am not sure how it will work. I basically have a parallel pipe system (a six inch that splits into a 6" and an 8") I know the flowrate and pressure (670gpm)...

thanks again for the information. I would prefer to use the scs method but its a tight site and the county prefers rational.

Thanks for the info psmart. I am modeling my system using the modified rational method and basically have a subcatchment discharging to pond 1, then pond 1 to pond 2 and pond 2 to pond 3 then to my outlet structure. I double click my subcatchment node and update the critical duration analysis...

Hello, Does anyone know if HydroCAD will create a hydrograph using the modified rational method and if so can it be created using typical storm durations Tc, 1.5Tc, 2Tc, etc? Thanks....

Hi all, I am trying to model a basin that is divided into three separate basins by 2 concrete walls. Think of a rectangle divided into three equal areas. The walls will have small orifices so i can get my water quality and then have weirs on top for quantity. The last basin (#3) will have the...

Hi all, Does anyone know where I can find information regarding the 'Waller Method' or the 'Pagan method' for approximating detention storage requirements? One of the municipalities we do work for references the method in there SW design specs for small sites < 5acres. I have asked around here...

Hi all, I am a new engineer and I am trying to model a distribution network for a subdivision. The layout is basically a teardrop with spurs coming off the teardrop. The spurs end with fire hydrants. I am using epanet2 to model the pipe line and I am absolutely clueless. The required fire...