Two feet of rain in 24 hours at that station now
Posted by Chris in Tampa on 8/27/2017, 6:52 am
Clear Creek @ I-45 has received 2 feet of rain in 24 hours from Harvey. Data not verified.

https://www.harriscountyfws.org/GageDetail/Index/110?span=24%20Hours&v=rainfall

Some river levels are already at record levels and climbing.

Some river levels have already surpassed the high water marks of Allison in 2001.

Some river levels are already over 10 feet above the top of their bank.
https://www.harriscountyfws.org/GageDetail/Index/130?span=24%20Hours&v=rainfall
Click "Stream Elevation" tab.

Some river levels are already way past 100-year flood events and nearing 500-year flood events.
https://www.harriscountyfws.org/GageDetail/Index/110?span=24%20Hours&v=rainfall
Same one with 24+ inches of rain in 24 hours. As of posting, stream elevation is 14.95 ft.

For that gauge:

Flood Frequency: Elevation
10% (10-year): 9.50'
2% (50-year): 11.60'
1% (100-year): 12.40'
.2% (500-year): 15.20'

Some historical storms:

Claudette 1979: 16.90'
Allison 2001: 10.70'
Ike 2008: 11.00'

Could be two 500-year events within a little over 38 years.
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Historic flood in progress - Bayous reaching & in some cases surpassing Allison levels - cypresstx, 8/27/2017, 2:39 am
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