The North Place

                                               

  North place car park.

The North place car park and Portland car park showing the boundaries of the whole site. 

Topographical X-sectional survey: In order to draw the cross sectional survey of north place car-park we had to do a site survey of the site boundary and then with the use of a levels map (fig 1) , Lidar digital surface model(DSM) fig 2,  and Lidar digital terrain model(DTM) fig 3, was able to know the contour lines running along and across the whole site.

Fig 1; Levels map showing the contour lines along the site and adjoining areas.

Fig 2; The digital surface model shows areas of high elevation in red and low areas in green.

Fig 3; The digital terrain model shows the lowest areas in pink, blue medium and the green the higher areas.

These data draws our conclusions to the fact that the north place car park looks relatively flat their is a slight and gradual decrease in elevation from the Portland car park to the North place car park. The areas in green within the entrance of the north place car park is also higher than all other places towards the north boundary(north passage). Also, the Dowty building is also marked with some green patches showing that it is also elevated than the monsoon exit of north passage and the posterior part of Dowty house.

     Cross sections AA

 

Fig 1; shows a slight increase in elevation from a value of 59.30( pedestrian pathway on monsoon street ) to 59.72 within the first third of North place car park).

Fig 2; shows a decrease and increase from 59.77 to 59.56 and 59.38 to 59.46 respectively.

Fig 3: shows a major increase in elevation from 59.46 to 59.80 within the north place car park.

Fig 4: shows also a marked increase in topography from a value of 59.64 within the north place car park to 60.11 at the boundary wall separating north place car park from the north place street. it also increases from 60.11 to 60.15 on the asphalt surfaced road.





                                                  Cross sections BB

Fig 5: shows the contour value starting from 60.90 of a raised planter on st Margaret's road and slightly decreasing to 60.73 onto the paving beside the storey teller bar. 

Fig 6: shows a slight increase in elevation from 60.40 to 60.57 within the Portland car park, and decreases from 60.57 to 60.41. 

   

Fig 7: shows further decrease in level from 60.41 to 60.22 also within the Portland car park.

Fig 8: shows a major decrease in level from a value of 60.22 to 60.07.

Fig 9: shows a slight increase in  contour value from 60.07 to 60.10 at Clarence court which further decrease to 59.97 on Clarence street etc.

Conclusions;

Cross sections AA, shows that there is a steady but gradual increase in elevation from monsoon street to North place car park and Portland car park. The major areas that would be affected by flooding in the absence of proper drainage are the exits of the north passage onto monsoon street, small patches of the the north place car park shown in pink in fig 3.    

 

Cross sections BB, shows that there is a decrease in topography from st Margaret's road all the way through Portland car park and a lower terrain at Clarence street. In the case of heavy rainfall, Clarence street and surrounding areas around their have a greater tendency to get flooded and immediate interventions to curb this should be put in place such as using sustainable urban drainage systems, planting more trees, using permeable paving etc.