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<!DOCTYPE HTML> <HTML lang="en-US"><head><META http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Chemistry & Environmental Dictionary: Covalent Radius - CWA (Clean Water Act) (EnvironmentalChemistry.com)</title><META NAME="ROBOTS" CONTENT="NOARCHIVE"> <meta name="superfish" content="nofish"><META NAME="ROBOTS" CONTENT="NOODP"><META NAME="DESCRIPTION" CONTENT="'Contains definitions for most chemistry, environmental and other technical terms used on EnvironmentalChemistry.com as well as many other chemistry and environmental terms."><META NAME="KEYWORDS" CONTENT="Chemistry Dictionary,chemistry,dictionary,chemistry terms,chemistry definitions,teacher resources,educational resources,careers,science articles,environmental issues,science"><META NAME="revisit-after" content="30 days"><SCRIPT type="text/javascript">if(top.location!=location){top.location.href=document.location.href}</script><link rel="canonical" href="https://EnvironmentalChemistry.com/yogi/chemistry/dictionary/C02.html"><link rel="alternate" type="application/rss+xml" title="RSS" href="/feed.xml" ><link rel="shortcut icon" href="https://envirochem.us/favicon.ico" type="image/x-icon"><link type="text/css" rel="stylesheet" media="all" href="https://envirochem.us/css/Main20170126.css"><link type="text/css" rel="stylesheet" media="screen" href="https://envirochem.us/css/screen20120422.css"><LINK rel="stylesheet" type="text/css" href="https://envirochem.us/css/printer.css" media="print"></head><BODY><div class="MB"><header><div class="TA"><a href="https://EnvironmentalChemistry.com/" title="EnvironmentalChemistry.com homepage & site map">EnvironmentalChemistry.com</a></div><div class="TB"><a href="/yogi/environmental" title="Environmental articles and resources" class="TBA">Environmental</a>, <a href="/yogi/chemistry/" title="Chemistry resources" class="TBA">Chemistry</a> & <a href="/yogi/hazmat/" title="Hazardous materials and regulatory resources" class="TBA">Hazardous Materials</a> News, <a href="/careers/" class="TBA">Careers</a> & Resources</div></header><script type="text/javascript">var strChemistry=' Selected';var strEnvironmental='';var strHazMat='';var strCareers='';var strHeadlines='';document.write(TopMenu());</script><div class="W"><div class="CA"><div class="BA"><ul class="Handheld"><li><a href="#Content">Skip to page content</a><li><A HREF="#Menu">Skip to site menu on this page</a></ul><script type="text/javascript">document.writeln(printInstructions());</script><span id="Content"></span><h1>Chemistry & Environmental Dictionary</h1><h2>Covalent Radius - CWA (Clean Water Act)</h2><h3 id="Covalent_Radius">Covalent Radius</h3><p>A chemical bond between atoms formed by the sharing of valence electrons.</p> <h3 id="Cross_section">Cross section</h3><p>The effective size of a <A href="N01.html#Nucleus">nucleus</A> in capturing a thermal <A href="N01.html#Neutron">neutron</A> (slow neutron). Larger cross sections have a greater probability of neutron capture.</p> <h3 id="Crystal_Structure">Crystal Structure (crystal system)</h3><p>The atomic arrangement of the atoms of an element when it is in its solid state.</p><div style="width:170px;display:inline;float:left;padding:0px 40px 20px"><h4 id="Cubic">Cubic</h4><img src="https://envirochem.us/images/periodic/Crystal/cubic.gif" class="Cubic" alt=""><h4 id="Cubic_Body_Centered">Cubic, Body Centered</h4><img src="https://envirochem.us/images/periodic/Crystal/cubic-bc.gif" class="CubicBC" alt=""><h4 id="Cubic_Face_Centered">Cubic, Face Centered</h4><img src="https://envirochem.us/images/periodic/Crystal/cubic-fc.gif" class="CubicFC" alt=""><h4 id="Hexagonal">Hexagonal</h4><img src="https://envirochem.us/images/periodic/Crystal/hexagon.gif" class="Hexagonal" alt=""><br></div><div style="width:170px;display:inline;float:left;padding:0 0 20px"><h4 id="Monoclinic">Monoclinic</h4><img src="https://envirochem.us/images/periodic/Crystal/mono.gif" class="Monoclinic" alt=""><h4 id="Orthorhombic">Orthorhombic</h4><img src="https://envirochem.us/images/periodic/Crystal/ortho.gif" class="Orthorhombic" alt=""><h4 id="Rhombohedral">Rhombohedral</h4><img src="https://envirochem.us/images/periodic/Crystal/rhomb.gif" class="Rhombohedral" alt=""><h4 id="Tetragonal">Tetragonal</h4><img src="https://envirochem.us/images/periodic/Crystal/tetra.gif" class="Tetragonal" alt=""><br></div> <h3 class="Clear" id="CWA">CWA (<em>Clean Water Act, Water Quality Act, WQA</em>)</h3><p>Similar to the <A href="C01.html#CAA">CAA</a>, the CWA placed controls on disposal facilities generating ash quench-water, landfill leach rate and surface water discharges. Amended in 1987 and called the Water Quality Act (WQA) it set further standards for discharging into the environment and expanded to include storm run-off.</p> <h3 class="NoPrint Dictionary">Dictionary Navigation</h3><ul class="Arrow NoPrint"><li class="AL"><A href="C01.html">CAS - Convection</a><li class="AU"><A href="">Dictionary Index</a><li class="AR"><A href="D01.html">Decomposition - DOT (USDOT)</a></ul> <script type="text/javascript">document.writeln(printSocial());</script><h3>Citing this page</h3><p>If you need to cite this page, you can copy this text:</p><p id="idCitePage" class="CiteLink">Kenneth Barbalace. Chemistry & Environmental Dictionary - Covalent Radius - CWA (Clean Water Act). EnvironmentalChemistry.com. 1995 - 2024. Accessed on-line: 12/2/2024<br>https://EnvironmentalChemistry.com/yogi/chemistry/dictionary/C02.html<br>.<div class="NoPrint" id="providelink"><h3>Linking to this page</h3><p class="TextSmall">If you would like to link to this page from your website, blog, etc., copy and paste this link code (in red) and modify it to suit your needs:</p><p class="CiteLink"><a href="https://EnvironmentalChemistry.com/yogi/chemistry/dictionary/C02.html">echo Chemistry & Environmental Dictionary (EnvironmentalChemistry.com)</a>- 'Contains definitions for most chemistry, environmental and other technical terms used on EnvironmentalChemistry.com as well as many other chemistry and environmental terms.<br>.</p><p class="TextSmall"><STRONG>NOTICE:</strong> While linking to articles is encouraged, <strong>OUR ARTICLES MAY NOT BE COPIED TO OR REPUBLISHED ON ANOTHER WEBSITE UNDER ANY CIRCUMSTANCES.</strong></p><p class="TextSmall"><strong>PLEASE, if you like an article we published simply link to it on our website do not republish it.</strong></p></div></div><DIV class="MM ColumnHeight NoPrint" id="Menu"><nav> <div id="SidebarLogin"><h2 id="H2Years">29 years on the web</h2><p id="PYears">Started 10-22-1995</p></div> <div style="margin: 0 auto 15px"> <form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="_s-xclick"><input type="hidden" name="hosted_button_id" value="CCBJP5DHB7DEA"><input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif" name="submit" alt="PayPal - The safer, easier way to pay online!" style="background:none;border-width:0px"><img alt="" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" style="height:1px;width:1px"></form> <h3 class="H3M">Please <a href="#share" title="Jump to social networking sharing widgets on this page." class="H3MA">Share</a> and/or <a href="#providelink" title="Suggested link code for this page." class="H3MA">Link To</a> This Page</h3><div class="Menu"><p>Please <a href="#share" title="Jump to social networking sharing widgets on this page.">share</a> and/or <a href="#providelink" title="Suggested link code for this page.">link</a> to this page if you find it useful or informative.</p></div><h3 class="H3M">Educators</h3><p><strong>We are a great educational resource!</strong> Use online or print pages out as classroom handouts. <A HREF="/yogi/about.html#Classroom">More info.</a></p><h3 class="H3M">Featured</h3><ul class="PMenu"><li><a href="/yogi/periodic/" title="Comprehensive data for each element of the periodic table including up to 40 properties, common chemical compounds. 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Includes USDOT hazmat transportation training modules as a free bonus.">USDOT HazMat Placards CD & training modules</A><li><A HREF="/yogi/hazmat/compliance/200601ExceptionsExemptionsVariances.html" title="All Leniencies are not created equally, what are the differences?">Exceptions, Exemptions and Variances</A><li><A HREF="/yogi/hazmat/compliance/HazMatTransportionPermitSystem.html" title="Federal Motor Carrier Safety Administration's hazardous materials transportation permitting system.">FMCSA HazMat Transportion Permit System</A></ul></ul></nav></div></div><div class="VB ColumnHeight ScreenOnly"></div></div><nav><div class="BN"><ul class="BNUL"><li class="BNLI"><A href="/yogi/privacy.html" class="BNA">Privacy Statement</A><li class="BNLI"><A href="/terms.html" class="BNA">Terms of Service</A><li class="BNLI"><a href="/yogi/about.html" class="BNA">About Us</a><li class="BNLI"><a href="/" class="BNA">Site Directory</a><li class="BNLI"><A href="/contact.html" class="BNA">Contact Us</a><li class="BNLI"><A href="http://twitter.com/envirochem" class="BNA">Follow Us on Twitter</a></ul></div></nav><footer><div class="Copyright">Copyright 1995 - 2024 Kenneth L Barbalace (<a href="https://KLBProductions.com/" title="Custom website development and database application development in Saco Maine.">J.K. 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