<h1><strong>SEWAGE AND REFUSAL DISPOSAL</strong></h1> CONTENT <ol> <li>Meaning and Types of Sewage and Refuse</li> <li>Methods of Sewage Disposal</li> <li>Methods of Refuse Disposal</li> </ol> <br> <img class="size-full wp-image-34074 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/sewage-and-refuse-disposal.jpg" alt="Sewage and refuse disposal" width="651" height="195" /> <br> <h2><strong>Meaning of Sewage and Refuse</strong></h2> Refuse refers to all solid wastes such as pieces of paper leaves, garbage, ashes and dead animals while sewage refers to liquid wastes such as urine, kitchen wastes or water from laundry. <br> <h2><strong>Types of Sewage </strong></h2> There are basically three types of sewage, namely:

<h1><strong>WATER SUPPLY</strong></h1> CONTENT <ol> <li>What is Water?</li> <li>Sources of Water Supply</li> <li>Qualities of Good Water Supply</li> <li>Uses of Water</li> </ol>   <h2><strong>What is Water?</strong></h2> Chemically a molecule of water is composed of two hydrogen atoms and one oxygen atom held together by covalent bonds. Water is precious to man’s existence as it is needed in agriculture, sports, industry, and domestic affairs. Water may be hard or soft. Hard water is not good economically as more soap is needed to form lather. When water is free from mineral salts, such water is called soft water as it dissolves soap quickly. <h2><strong>Sources of Water Supply</strong></h2> The two major sources of water supply to man are: <ol> <li>Surface Water</li> <li>Ground Water</li> </ol>   <h3><strong>Surface Water Supplies</strong></h3>