The first image is a part of a plan, from the Environment Agency, of the proposed Oxford Flood Alleviation Scheme (OFAS) north of the Botley Road. This shows (as at 16 September 2016) that a key flood defence bund is planned for that scheme, running through the area where the car park extension is proposed.
The second image shows the area for the proposed extension to the Seacourt P&R.
It is not clear that the bund and the car park extension could co-exist. OFAS will reduce the risk of flooding in Oxford, vital for people and the future prosperity of the city, not least in the face of climate change. The car park extension proposal is flawed in many ways; the plan should be dropped.