Long steep ramp

[Stephen128]

I am outside my area; my MEng is in computers. Looking at a planning application put together by hopeless cowboys.

I have been studying the "Design recommendations for multi-storey and underground car parks (3rd Edition)" and anything else I can get my hands on. The design put forward is confusingly far outside the guidelines I can find.

The plan includes a 1 in 7.83 ramp (12.5%) straight up from the highway to an outdoor car park. The ramp is 24.4 meters long in plan.

Is this permissible in the UK?

 

[piles]

Hello

You will have to check the local building regulations to see if that is in confirmation with their code.

 

[darthsoilsguy2]

another thing to check into... whether stormwater would be allowed to flow down a ramp onto the public road.

 

[Stephen128]

A condition has been applied to add a single perforated burred drain at the bottom of the ramp.

The local rules are in a document called the 'Surrey Design Technical Appendix'. It only states that a 1 in 8 ramp must be 'as short as possible'. Given that the 1 in 8 ramp ramp is double the permissible length in the "Design recommendations for multi-storey and underground car parks (3rd Edition)"; it seems difficult to describe it as 'as short as possible'. But this is being ignored.

The 'Surrey Design Technical Appendix' indicates slopes in excess of 1 in 10 (10%) must be at least 6 meters from the highway. This regulation is also being silently ignored.

I am beginning to think that the problem is that the person at the highways authority that signed off on the project also appears to have been the person that designed the ramp.

 

[darthsoilsguy2]

sounds similar to
203 E Main St
Durham, North Carolina
except without a transition point
google map/streetview it

 

[Stephen128]

The length is similar to E Main St. It is difficult to estimate the gradient from google street view.

The E Main St ramp looks to have separate 4 meter wide up and down ramps. The ramp in this case is 6.1 meters wide total, bi-directional without curbs and has a 1 in 24 cross gradient (4%). The lower transition zone will come from 'regrading' an existing turning head in the road outside the site.

The required upper transition zone is beyond the 24.5 meter length. It is to double as a pedestrian crossing. Strikes me as being quite dangerous for kids to cross on the brow of a 12.5% ramp?