LID Usage Editor in InfoSWMM and H2OMap SWMM

LID Usage Editor in InfoSWMM and H2OMap SWMM

The LID Usage Editor is invoked when the LID Usage Icon of a Subcatchment is selected for editing. It is used to identify a group of previously defined LID controls that will be placed within the Subcatchment, the sizing of each control, and what percent of runoff from the non-LID portion of the Subcatchment each should treat.

The editor displays the current group of LIDs placed in the Subcatchment along with buttons for adding an LID unit, editing a selected unit, and deleting a selected unit. These actions can also be chosen by hitting the Add Row, the Update Row, and the Delete Row, respectively. Clicking on the LID Icon will bring up an LID Usage Editor where one can enter values for the data fields shown in the Usage Editor.

LID Usage Icon in the Browser that calls up the LID Usage Editor.

LID Usage Editor

Note that the total % Of Area for all of the LID units within a Subcatchment must not exceed 100%. The same applies to % From Impervious.

The LID Usage Editor is invoked from a Subcatchment’s LID Group Editor to specify how a particular LID control will be deployed within the Subcatchment. It contains the following data entry fields:

· Control Name

o The name of a previously defined LID control to be used in the Subcatchment. (LID controls are added to a project by using the Data Browser — see LID Utilization)

· Number of Replicate Units

o The number of equal size units of the LID practice (e.g., the number of rain barrels) deployed within the Subcatchment.

· Area of Each Unit

o The surface area devoted to each replicate LID unit (sq. ft or sq. m). If the LID Occupies Full Subcatchment box is checked, then this field becomes disabled and will display the total Subcatchment area divided by the number of replicate units. (See LID Placement for options on placing LIDs within sub catchments.) The label below this field indicates how much of the total Subcatchment area is devoted to the particular LID being deployed and gets updated as changes are made to the number of units and area of each unit.

· Top Width of Overland Flow Surface

o The width of the outflow face of each identical LID unit (in ft or m). This parameter only applies to LID processes such as Porous Pavement and Vegetative Swales that use overland flow to convey surface runoff off of the unit. (The other LID processes, such as Bio-Retention Cells and Infiltration Trenches simply spill any excess captured runoff over their berks.)

· % Initially Saturated

o For Bio-Retention Cells this is the degree to which the unit’s soil is initially filled with water (0 % saturation corresponds to the wilting point moisture content, 100 % saturation has the moisture content equal to the porosity). The storage zone beneath the soil zone of the cell is assumed to be completely dry. For other types of LIDs it corresponds to the degree to which their storage zone is initially filled with water.

· % of Impervious Area Treated

o The percent of the impervious portion of the sub catchment’s non-LID area whose runoff is treated by the LID practice. (E.g., if rain barrels are used to capture roof runoff and roofs represent 60% of the impervious area, then the impervious area treated is 60%). If the LID unit treats only direct rainfall, such as with a green roof, then this value should be 0. If the LID takes up the entire Subcatchment then this field is ignored.

· Send Outflow to Pervious Area

o Select this option if the outflow from the LID is returned onto the sub catchment’s pervious area rather than going to the sub catchment’s outlet. An example of where this might apply is a rain barrel whose contents are used to irrigate a lawn area. This field is ignored if the LID takes up the entire Subcatchment.

· Save Detailed Report File

o The name of an optional file where detailed time series results for the LID will be written. Turn off the checkbox to remove any detailed reporting. Consult the LID Results topic to learn more about the contents of this file.

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