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Table 1 Attributable large-scale flood area and volume increases associated with published precipitation magnitude attribution statements (units: volume = 106 m3; area = km2). RW Risser and Wehner 2017, VO van Oldenborgh et al. 2017, W Wang et al. 2018

From: Attributable human-induced changes in the magnitude of flooding in the Houston, Texas region during Hurricane Harvey

Source Attributable precipitation increase Rainfall coefficient Attributable flood
Greater Houston South Houston & Pasadena Deer Park
Vol. Area Vol. Area Vol. Area
RW Best estimate (small region); W upper bound 38% 0.72 39% 29% 87% 52% 25% 31%
RW Best estimate large region) 24% 0.81 25% 18% 48% 25% 18% 21%
W best estimate 20% 0.83 20% 15% 38% 20% 16% 18%
RW likely lower bound (small region); VO upper bound 19% 0.84 19% 14% 36% 18% 15% 18%
W lower bound 13% 0.88 13% 10% 23% 11% 11% 12%
VO lower bound 8% 0.93 8% 6% 14% 6% 7% 7%
RW likely lower bound; large region 7% 0.93 7% 5% 12% 5% 6% 6%
actual 0% 1.00 0% 0% 0% 0% 0% 0%