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Parking Lots

The sound emission of parking lots can be calculated either

  • according to RLS-90, or
  • according to the parking lot study by the Bavarian Environmental Agency LfU (several editions available), or
  • according to the Swiss standard SN 640 578:2006-07.

For the calculation of sound propagation, the German road noise standard RLS-90 or the selected guideline for industrial sources may be applied. Depending on selected calculation method the dialog Parking Lot is showing the respective input boxes.

Dialog Parking Lot

Dialog options

Name, Memo-Window, ID, ObjectTree, Master

see Dialog Options Name, ID, INFO, ObjectTree, Master in the manual "Introduction to CadnaA"

Type

The selected type of the parking lot determines whether the road noise standard RLS-90 or the selected guideline for industrial sources is used for calculation of sound propagation („public (RLS)“ or „private (Industry)“).

Note

Both, the LfU studies, as well as the Swiss standard SN 640 578: 2006-07 just represent an emission model, but not a propagation model.

Calc emission according to ...

The following options are available:

Note

In LfU-study 1995 two types of procedures are described, an „exact“ and an „approximative“ procedure. Using the exact procedure requires the noise from search and passage of vehicles to be modeled using the object „Road“ while the approximative procedure makes use of a global estimate.

Note

With respect to the LfU-studies 2003 and 2007 the term „separated“ refers to the separate modeling of the noise by parking events and of the noise from search and passage of cars. In this case, the noise from search and passage of cars has to be modeled by separate roads. In case the so-called „combined“ procedures are used (no „separate“ in the designation) the noise emission modeled includes the correction KD to consider the noise by search and passage of vehicles.

Further details on the calculation of emission according to RLS-90, the most recent edition of LfU parking lot study and according to SN 640 578 are given in chapters RLS-90 to SN 640 578.

Input/Display of Emission

  • input of the emission level L*m,E (dBA) for the time periods Day/Evening/Night
  • display of the A-weighted sound power level PWL (dBA) for the time periods Day/Evening/Night

Counts, Parking Spaces

For calculations according to RLS-90, the editions 1993 and 1995 of the LfU study, and the Swiss Standard SN 640 578 the number of lots is always the relevant reference quantity. In the LfU study 2007, besides the number of lots, also other reference quantities are used (e.g. net sales floor area).

First, select the type of parking lot via the file selector symbol . Make sure that the select numbers of events refer to the selected guideline. Upon closing the table Parking Lot:Number of Events the reference quantity is shown in the input box to the right of „Reference Quantity“ with LfU-Study 2007 selected.

  • Number of Parking Spaces: Enter here the number of parking spaces or any other figure in units of the reference quantity.
  • Number of Spaces per Reference Quantity f: In this box the parking lot type specific figure f according to the table Parking Lot:Number of Events is displayed.

Example

Assuming the reference quantity is „1 m² net sales floor area“ and f=0.04, this means that 25 m² net sales floor area is required each single parking space (0.04 * 25 = 1).

  • Events per Hour and Parking Space: In this box the parking lot type specific number of events per hour and parking lot or reference quantity resp. is displayed (as resulting from the table Parking Lot:Number of Events). The number of movements for Day is also used for Evening.

Penalty for Parking Lot Type

The penalty Dp (accord. to RLS-90 and SN 640578) or Kpa (accord. to LfU studies) can be entered or the type of parking lot is selected from the list box (see chapters RLS-90 to SN 640 578).

Option "incl. Interval Maximum Penalty"

In conjunction with private parking lots activating this option - provided a LfU study selected - enables to apply the correction for impulsive noise components Ki depending on the type of parking lot. The value displayed is in this case the sum (Kpa + Ki).

Option "Penalty for Road Surface"

When using the combined procedure according to LfU study 2007 a correction KStro is used to take different road surfaces into account (direct input or selection from a list).

Operating Time (min)

With the parking lot type "private (ind)" selected, the operation time (in minutes) can be entered here for parking lots not constantly operational. The time specified refers to the time periods D/E/N as specified on the dialog Configuration, tab „Reference Time“. When this check box is deactivated a permanent emission is assumed.

Library with Number of Events

The table Parking Lot:Number of Events can be accessed via the dialog Parking Lot or from the Tables menu, Libraries (global)|Parking Lot Movements. The data is saved globally and is thus available for further new CadnaA projects as well.

When editing a new data set enter in box „Ref. Quantity“ an informative text string. Enter the „Number of Spaces per Ref. Quantity f“ and the „Events per Hour and Parking Space“ (or per Reference Quantity) for the daily periods Day and Night. The number of events for Day will be used for Evening/Recreation Time as well. The box „Source“ offers to enter remarks regarding the data’s origin.