A Method to Assess Localized Impact of Better Floodplain Topography on Flood Risk Prediction

Table 1

Results of the proposed targeted observation analysis. Note that the analysis is based on a 1 : 10,000 year event. Furthermore, we wish to note that the economic impact analyzed here is only from inundation differences and does not include any other changes with potential economic impact such as infrastructure planning or climate change adaptation strategies, for instance.

Region of assimilation	Area (km^2)	Global improvement in flooded area prediction	Regional improvement in flooded area prediction	Population (2015 UN adjusted)	Difference in people affected	Regional loss of economic cost (2005 GDP in billion USD)	Global economic gain from better regional flood prediction (2005 GDP in billion USD)
01	237.6	24.0%	77.8%	4,324	3,364	0.000	1.511
02	233.9	25.3%	40.0%	7,581	3,032	0.400	1.593
03	2,441.3	29.1%	44.6%	167,029	74,495	0.103	1.832
04	309.1	27.7%	0.5%	6,819	34	1.511	1.744
05	123.3	25.8%	28.4%	23,037	6,542	0.896	1.624
06	553.4	13.1%	14.3%	7,600	1,087	0.144	0.825
07	25.1	30.4%	17.8%	494	88	0.000	1.914
08	60.7	18.1%	30.6%	1,070	327	0.000	1.139
09	138.5	32.5%	32.0%	2,462	788	0.000	2.046
10	101.2	26.0%	32.0%	1,906	610	0.000	1.637
11	348.4	27.1%	65.7%	7,233	4,752	1.670	1.706
12	240.9	22.5%	29.1%	4,950	1,441	1.571	1.417
13	99.4	30.7%	43.6%	2,317	1,010	0.000	1.933
14	357.2	24.7%	38.5%	7,508	2,890	0.000	1.555
15	79.3	26.0%	26.6%	1,619	431	0.000	1.637
16	3,237.5	23.3%	48.4%	98,560	47,703	0.000	1.467
17	165.5	3.4%	26.5%	3,825	1,014	0.000	0.214
18	294.8	13.6%	60.5%	7,967	4,820	0.000	0.856
19	71.9	25.3%	47.8%	2,332	1,115	0.000	1.593
20	154.2	30.6%	44.9%	2,394	1,075	0.000	1.926
Total	9,273.1	30.8%	N/A	361,027	156,618	6.295	1.939 (average)