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<title>Why Houston is under water: Harvey's destruction explained - Technology &amp; Science - CBC News</title>

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button.cbc-globalnav-dropdown:active:after,#cbc-globalnav button.cbc-globalnav-dropdown:focus:after,#cbc-globalnav button.cbc-globalnav-dropdown:hover:after{background-image:url(data:image/svg+xml;base64,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);-moz-transform:rotate(180deg);-ms-transform:rotate(180deg);-webkit-transform:rotate(180deg);transform:rotate(180deg)}#cbc-globalnav button.cbc-globalnav-dropdown[aria-pressed=true]:after{background-image:url(data:image/svg+xml;base64,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);-moz-transform:rotate(0);-ms-transform:rotate(0);-webkit-transform:rotate(0);transform:rotate(0)}#cbc-globalnav .cbc-globalnav-container .cbc-globalnav-menu{display:none;background-color:#ECECEC;padding:0 10px;width:65px}#cbc-globalnav .cbc-globalnav-container .cbc-globalnav-menu:active,#cbc-globalnav .cbc-globalnav-container .cbc-globalnav-menu:focus,#cbc-globalnav .cbc-globalnav-container .cbc-globalnav-menu:hover{background-color:#575757}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false]+div+div+div{display:none}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social{padding-bottom:0;display:block}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social button{border-top:1px solid #FFF;padding:4px 0 4px 35px;background-color:#575757;color:#FFF;text-transform:none}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social .profile{margin:0 20px 20px}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social .profile li{padding:5px 0}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social li{border:none}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social span{display:inline;border:none}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social .cbc-globalnav-buttons{margin:0;width:auto;max-height:none}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social div{width:100%;min-height:0;margin:0}#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social .cbc-globalnav-info,#cbc-globalnav .cbc-globalnav-container[aria-hidden=false] li .globalnav-dropzone-social .cbc-globalnav-member div+div{display:none}</style><nav id="cbc-globalnav" class="sclt-globalnav" role="navigation" aria-label="CBC Global Navigation"><div class="cbc-globalnav-container"><span><a target="_top" class="cbc-globalnav-icon" href="http://www.cbc.ca">CBC.ca</a><button class="cbc-globalnav-menu" type="button" aria-label="menu button" aria-pressed="false">MENU</button></span><ul><li><a target="_top" class="" href="http://www.cbc.ca/television">TV</a></li><li><a target="_top" class="" href="http://www.cbc.ca/radio">Radio</a></li><li><a target="_top" class="" href="http://www.cbc.ca/news">News</a></li><li><a target="_top" class="" href="http://www.cbc.ca/sports">Sports</a></li><li><a target="_top" class="" href="http://cbcmusic.ca/">Music</a></li><li><a target="_top" class="" href="http://www.cbc.ca/life">Life</a></li><li><a target="_top" class="" href="http://www.cbc.ca/arts/">Arts</a></li><li><a target="_top" class="" href="http://www.cbc.ca/2017">Canada 2017</a></li><li><button class="cbc-globalnav-region cbc-globalnav-dropdown" type="button" aria-label="Local Menu" aria-pressed="false">Local</button></li><li><button class="cbc-globalnav-more cbc-globalnav-dropdown" type="button" aria-label="More Navigation Menu" aria-pressed="false">More</button></li></ul><ul><li><a 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			<h1 class="story-title">Why Houston is under water: Harvey's destruction explained</h1>
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		<h3 class="story-deck">It's been raining since Aug. 24 and is expected to continue until at least Sept. 1</h3>
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			<span class="delimited">Posted: Aug 29, 2017 9:06 PM ET</span>
			<span>Last Updated: Aug 30, 2017 10:50 AM ET</span>

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              A man wades through floodwaters from tropical storm Harvey while helping a boy in East Houston on Monday. Water levels have broken records in the state. (Adrees Latif/Reuters)            </p>
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															<li>  <a href="/news/technology/hurricane-harvey-climate-change-1.4265636">
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			 			<p>When Hurricane Harvey slammed into Texas on Friday, it came with dire warnings about rainfall and the potential for severe flooding.</p> 
<p>But it's likely that most residents of the second most populous&nbsp;state never anticipated an&nbsp;amount of water that has shattered records.</p> 
<p><strong>Here's a look at just how much water the region is contending with during this crisis:</strong></p> 
<p>In the first graphic, the red dots show areas of major flooding. In the three locations&nbsp;highlighted here, the numbers reflect the water level of the rivers.</p> 
<p>At the Buffalo Bayou, for example, a river height of 9.7 metres is considered&nbsp;a major flood.&nbsp;But the river crested Monday at 11.8 metres.&nbsp;</p> 
<div class="figure">
 <img src="https://i.cbc.ca/1.4267485.1504039188!/fileImage/httpImage/image.jpg_gen/derivatives/original_620/harvey-flooding-areas-graphic.jpg" alt="Harvey flooding areas graphic" width="100%">
 <p class="figure-caption"></p>
</div> 
<p>And it's not over yet:&nbsp;the forecast calls for an additional 15&nbsp;to 31&nbsp;centimetres of rain through to Friday.</p> 
<p>On Tuesday, the National Oceanic and Atmospheric Administration (NOAA) said in a public advisory, "Catastrophic and life-threatening flooding continues in southeastern Texas and portions of southwestern Louisiana."&nbsp;</p> 
<p>Here's how the rainfall from the Harvey&nbsp;system compares to that from&nbsp;Hurricane&nbsp;Rita, which was the last major hurricane in the area.</p> 
<div class="figure">
 <img src="https://i.cbc.ca/1.4267615.1504101247!/fileImage/httpImage/image.jpg_gen/derivatives/original_620/hurricane-rita-and-harvey-comparison.jpg" alt="Hurricane Rita and Harvey comparison" width="100%">
 <p class="figure-caption"></p>
</div> 
<p>"Isolated storm totals may reach 50 inches (127&nbsp;centimetres)&nbsp;over the upper Texas coast, including the Houston/Galveston metropolitan area," NOAA&nbsp;warned.</p> 
<p>The graphic below shows Harvey's path and strength. It made landfall as a Category 4 hurricane Friday, where it lingered as a tropical storm before moving briefly offshore.</p> 
<p>The system is expected to move inland again and continue northeast as a tropical depression.</p> 
<div class="figure">
 <img src="https://i.cbc.ca/1.4268333.1504104543!/fileImage/httpImage/image.jpg_gen/derivatives/original_620/harvey-track-graphic-with-houston.jpg" alt="Harvey track graphic with Houston" width="100%">
</div> 
<p>The National Weather Service office in Houston&nbsp;<a href="https://twitter.com/NWSHouston/status/902552433645277184">tweeted</a>&nbsp;about the record-breaking rainfall Tuesday.</p> 
<p></p>
<blockquote class="twitter-tweet" lang="en">
 <p>The record for total rainfall from a tropical system has been BROKEN! Mary's Creek at Winding Road recorded 49.20", previous record is 48". <a href="https://t.co/yCjuUOR8p3">pic.twitter.com/yCjuUOR8p3</a></p>— 
 <a href="https://twitter.com/NWSHouston/status/902552433645277184">@NWSHouston</a>
</blockquote>
<script async src="//platform.twitter.com/widgets.js" charset="utf-8"></script> 
<p>As for the human toll, more than 17,000 people have sought refuge in Texas shelters — a number that is only expected to grow. Officials have also warned that the death toll&nbsp;— sitting at more than a dozen, according to&nbsp;some estimates&nbsp;— will likely also rise once floodwaters recede.</p> 
<p>"We know in these kinds of events that, sadly, the death toll&nbsp;goes up historically," Acevedo told The Associated Press. "I'm really worried about how many bodies we're&nbsp;going to find."&nbsp;</p> 
<ul> 
 <li><strong><a href="http://www.cbc.ca/news/world/texas-harvey-stranger-rescues-1.4266192">'We're going back.' Strangers help rescue people stranded by Harvey</a></strong></li> 
 <li><strong><a href="http://www.cbc.ca/news/world/hurricane-harvey-texas-saturday-wind-rain-1.4263643">'The water is swallowing us up': Harvey leaves hundreds in Texas pleading for help</a></strong></li> 
 <li><strong><a href="http://www.cbc.ca/news/health/hurricane-harvey-health-risks-for-survivors-1.4266620">Hurricane Harvey survivors will face health risks even after emergency is over</a></strong></li> 
</ul> 
<p></p> 
<p></p>		</div>
			 	
		    			<cite class="story-source">with files from The Associated Press</cite>
	
		
						        

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