Software Demonstration Please left click to advance through the show CRM Stormflow Software Demonstration Please left click to advance through the show

CRM Stormflow Infiltration and Attenuation Calculator BRE 365 and CIRIA 156 infiltration Map Based FSR Rainfall Ability to manually enter FEH data Fixed flow / Orifice / Vortex Controller Output to MS Word Vista / Win 7 Compatible

CRM Stormflow main screen. To start in FSR mode click the rainfall icon

Select the area from the UK map, then click on the town closest to the project

Enter the optional Catchment Name, the area of buildings and dense surfacing. Run off coefficients default to 95% and 90% but can be changed.

Enter the storage details as length, width and depth Enter the storage details as length, width and depth. Assume a size to start with, which can be refined in light of results.

Next, the outflow details are selected, the options being soakaway, fixed outflow, orifice plate or vortex controller. In this case we are aiming for a max discharge of 11 l/s. The orifice plate has been selected, a size of 75mm entered, which gives a peak outflow of 21.9 l/s, and shows the storage fails, due to inadequate size

Next, the storage size is adjusted to bring the water level within the storage depth, and the reduced height brings the outflow to approximately the desired flow. If an exact correlation were required, the orifice size could be modified, and the storage rechecked.

For Vortex controllers the user can enter water depth and flow rate data, then call a defined controller from a pull down list. The insert shows the vortex controller data entry page.

The final attenuation option is the fixed outflow The final attenuation option is the fixed outflow. This option assumes a constant discharge regardless of head, such as would be generated by a pumped outfall, where the change in static head was a small component of total pump head losses.

CRM Stormflow will also size a soakaway using either the BRE method or the CIRIA 3D method of calculation. The infiltration rate is input in m/hour. For the CIRIA 3D case a Safety Factor is also selected – in this case ‘minor inconvenience’.

A combination of a infiltration and attenuation can also be assessed but only with attenuation by the fixed outflow method.

As a new feature in CRM Stormflow version 6 if a project contains more than one attenuation tank or soakaway then these can be added to a single data file, accessed in turn using the tab system, deleted if necessary, and all output as one Microsoft Word file.

Project details can be input by opening the Project Window, these will be sent to Microsoft Word when the design is output. The project can also be saved to a file and re-opened using buttons on the tool bar or by using the pull down menues.

Typical Output to Microsoft Word

Software Demonstration For more details contact CRM on: CRM Stormflow Software Demonstration For more details contact CRM on: 01204 701934 Sales@crmrainwater.co.uk