00:10in prospector expand catchments and then expand the storm catchments group in this drawing we
00:17have created some catchment areas for our storm drainage catchments are areas of ground which
00:24will capture rainfall runoff and are used to calculate input flows to our network the cyan
00:31polyline in the drawing is a catchment area that we need to add to our group in prospector right
00:38click on the storm catchments group you can create a catchment from an object or you can create a
00:44catchment automatically from a surface by picking a discharge point choose create catchment from
00:51object and select the cyan polyline on the command line it's asking you to pick a polyline for the
00:57flow path we don't need a flow path for this catchment so press escape to skip this step in
01:05the crate catchment dialog will accept the default name group and styles for the reference pipe network
01:14structure use the select button and pick the storm structure in the catchment as shown this should
01:21be mh9 the runoff coefficient is an estimate of the fraction of total rainfall in the catchment that
01:28will flow into the network set this to 0.7 click ok to save the catchment and press escape to
01:36end the
01:36command we can now run our analysis go to the analyze ribbon tab for a comprehensive drainage analysis you
01:47can export the network to external applications such as storm sewers or storm and sanitary analysis we're
01:55going to run a basic flow analysis in civil 3d select analyze gravity network in the drawing press enter
02:03to select the network from a list in the select pipe network dialog select the storm one network and
02:11click ok there are three types of analysis that we can run we can analyze flows in the pipes and
02:19resize
02:20the pipes and reset the inverts we can calculate the energy and hydraulic grade lines and we can analyze
02:28inlets to check capacity select the first and second options for the outfall it is automatically
02:36selected the headwall structure based on the structure type select hold outfall invert the tail water
02:46condition calculates the water level at the outfall we will use elevation and leave this at zero for rainfall
02:56data click on the browse button and choose the sample fha idf file these are intensity duration
03:06frequency curves and provide rainfall information in tabular form click open now click on the intensity
03:14table button here you can see the tabular rainfall data the columns contain rainfall values in inches per
03:23hour split into different storm durations the rows indicate the probability of the storm event occurring
03:30in any given year select the row one in five for our storm and then click save and return now
03:40click on the
03:40settings button set the minimum velocity to five feet per second and set the maximum velocity to 30 feet
03:49per second set the minimum cover depth to three feet set the default n value the friction coefficient for the
03:59pipe to 0.013 the minimum crown drop should be 0.1 the minimum time of concentration will be 10
04:11minutes this
04:12is an estimate of the time taken for runner flows to reach the network click save and return now click
04:21on
04:21the network details button this displays a summary of all of the inputs for the analysis items not
04:29grayed out can be edited time of concentration has been calculated based on the catchments note that
04:38where it is less than 10 minutes then the default of 10 minutes will be used the catchments the
04:45catchment and areas for each structure are listed if there are any direct inputs into the network such
04:51as additional branches these can be entered as known flows click back to return to the analysis now click the
05:02analyze button to run the analysis in the results you can see that some of the pipes are shown as
05:08flooded and so the
05:10network has failed click start over go back to the settings and change the minimum velocity to three feet per
05:19second click save and return to the
05:21return in the outfall deselect hold outfall invert now click on analyze again this time you can see that some
05:31pipes are surcharged in other words the water level is above the crown of the pipe however the manholes are
05:38not flooded
05:40the pipe diameter columns show the pipes have been resized to handle the storm flows note the items colored in
05:48red do not meet the minimum requirements for either velocity or pipe slope in the top
05:55right corner click on the profile button and in the drawing pound to the profile viewer show and pick the
06:02view review the changes to the network press escape to
06:09return to return to the results now click on the report button browse to your project reports folder and save
06:19the report with your chosen name the report may take some time to save if excel is installed the report
06:30should open automatically
06:35review the report and then close it to commit the changes to the network click apply again it may take
06:47some time to save the changes once the changes are made pipe network will update in the profile views close
06:56the analyze dialog now you can review the pipe network and
07:01in the profile view when you look at the profile view you'll see extra lines have been added
07:08the magenta line represents the energy grade line from the analysis the green dashed line represents the hydraulic grade line
07:18you can see where the hydraulic grade line is running above the pipe indicating the pipe is surcharged
07:26if i select a pipe and look at the pipe properties you can see the information from the analysis has
07:33been added into the pipe properties
07:34this
07:35this
07:35is
07:35is
