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SLOPE BAND ANALYSIS - CITY OF LOS ANGELES

Discussion in 'General Land Surveying' started by Paul Plutae, Nov 3, 2011.

  1. Paul Plutae

    Paul Plutae 4-Year Member

    Joined:
    Jul 1, 2010
    Messages:
    1,271
    Location:
    Glendale
    In March of 2011 the city adopted a new ordinance for hillside designated areas. The ordinance reference is Baseline Hillside Ordinance No. 181624.

    The ordinance is a whole new ball game regarding any type of improvement within the specific hillside areas.

    The ordinance has created new work for Land Surveyors. According to the ordinance, a Slope Band Analysis Map has to be prepared by either a registered civil engineer of a licensed land surveyor. Since the Slope Band Analysis Map deals directly with the location of property lines, it appears that this map will be generated mainly by licensed surveyors.

    [​IMG]

    I just did my first map and thought I would post the example of it as well as how I was able to do it easily using Cadd.

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    I made a component, or a block, as it is termed in Autocad, of a series of circles with the different slope areas named. The parameters that the ordinance details, for instance, have ranges like 0% to 14.99%. I just ignored that 14.99% and made the set of circles at 15, 30, 45, 60 and 100%. Common sense needs to be injected into this new map.

    [​IMG]

    The component was made for one foot contours.

    Since blocks and components create a phantom drag image before placement, one can find the changes of slope ratios easily.

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    The above image shows the drag image centered on a contour at a slope change area where the 0% to 15% rate switches to a 15% to 30% rate. You can see where contour line 481 intersects the circle of 15%-30% rate.
     
  2. Ryan Versteeg

    Ryan Versteeg 5-Year Member

    Joined:
    Jul 1, 2010
    Messages:
    438
    Location:
    Chino, CA
    Licensed in:
    CA, UT
    That looks really nice Paul. Excellent product for your clients as always.
     
  3. dhunter

    dhunter 4-Year Member

    Joined:
    Jul 4, 2010
    Messages:
    143
    Location:
    Ventura County, California
    Thanks for sharing Paul! Excellent presentation as usual. Good information to know. Did this project trigger a need to file a corner record?
     
  4. Paul Plutae

    Paul Plutae 4-Year Member

    Joined:
    Jul 1, 2010
    Messages:
    1,271
    Location:
    Glendale
    Dennis

    I had filed an RS on this property in 2003, but your question is a good one.

    I do not think that a CR or ROS would be needed for these types of maps. This lot is a portion of a lot and the dimensions shown are from the RS that I filed. The map does not show any ties from the title lines to improvements, nor does it show ties to other monuments of record.

    The only listed items on my map that the city wants to see is the scale, contour interval, datum reference and FAR (Floor Area Ratio) x sq. footage. The purpose of the map is not to establish boundaries but to separate areas of slope bands.

    I think that any future maps of this type that I do, I will not dimension the map at all. I will just reference the property by address and leave off some of the notes.

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    The above image is all the city wants, and because of some of the low mentality individuals policing surveyors with a big hammer of discipline over items that really do not matter, I am forced to eliminate information that is useful to a client seeking to place a simple 200 sq foot addition on their land.

    Good question Dennis, thanks for asking it.

    PS..

    There is a form that is filled out that accompanies the map that has the address on it, so even that will not be included on any future maps of this type. No sense loading the guns of idiots so they can attempt a pot shot at you.
     

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