Avatar

SLOPE BAND ANALYSIS - CITY OF LOS ANGELES (Land Surveying)

by Paul Plutae @, Glendale, Thursday, November 03, 2011, 08:27 (1308 days ago)

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.

[image]

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.

[image]

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.

[image]

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.

[image]

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.

Avatar

SLOPE BAND ANALYSIS - CITY OF LOS ANGELES

by Ryan Versteeg @, Chino, CA, Thursday, November 03, 2011, 09:42 (1308 days ago) @ Paul Plutae

That looks really nice Paul. Excellent product for your clients as always.

--
Ryan M. Versteeg, PLS (CA & UT), CFedS

Avatar

SLOPE BAND ANALYSIS - CITY OF LOS ANGELES

by dhunter ⌂ @, Ventura County, California, Friday, November 04, 2011, 09:40 (1307 days ago) @ Paul Plutae

Thanks for sharing Paul! Excellent presentation as usual. Good information to know. Did this project trigger a need to file a corner record?

--
Dennis Hunter, PLS PE

Avatar

Dennis

by Paul Plutae @, Glendale, Friday, November 04, 2011, 10:55 (1307 days ago) @ dhunter

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.

[image]

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.

RSS Feed of thread