Draw half circle with CSS or SVG

Why not use two path elements with an arc command?

<svg width="135" height="135">
  <path d="M125,85 a60,60 0 1,0 -115,0" fill="#E79A16" /><!--Top Half-->
  <path d="M10,85 a60,60 0 0,0 115,0" fill="#D78500" /><!--Bottom Half-->
</svg>

You can separate them easily.

<svg width="135" height="135">
  <path d="M125,80 a60,60 0 1,0 -115,0" fill="#E79A16" /><!--Top Half-->
</svg>
<svg width="135" height="135">
  <path d="M10,80 a60,60 0 0,0 115,0" fill="#D78500" /><!--Bottom Half-->
</svg>
<svg width="135" height="135">
  <path d="M10,0 a60,60 0 0,0 115,0" fill="#D78500" /><!--Bottom Half-->
</svg>


You can do it with CSS:

.partial-circle {
  position: relative;
  height: 20px;
  width: 100px;
  overflow: hidden;
}
.partial-circle:before {
  content: '';
  position: absolute;
  height: 100px;
  width: 100px;
  border-radius: 50%;
  bottom: 0;
  background: #D08707;
}
<div class="partial-circle"></div>

You can also have the two parts:

.partial-circle {
  position: relative;
  width: 100px;
  overflow: hidden;
}
.partial-circle:before {
  content: '';
  position: absolute;
  height: 100px;
  width: 100px;
  border-radius: 50%;
}
.partial-circle.top {
  height: 80px;
}
.partial-circle.bottom {
  height: 20px;
}
.partial-circle.top:before {
  top: 0;
  background: #E19B21;
}
.partial-circle.bottom:before {
  bottom: 0;
  background: #D08707;
}
<div class="partial-circle top"></div>
<div class="partial-circle bottom"></div>

Simpler way without using path

<svg version="1.1" width="64" height="64" xmlns="http://www.w3.org/2000/svg">
    <clipPath id="cut-off">
        <rect x="0" y="0" width="64" height="40"/>
    </clipPath>

    <circle cx="32" cy="32" r="32" fill="#d08807"/>
    <circle cx="32" cy="32" r="32" fill="#e19b22" clip-path="url(#cut-off)"/>
</svg>