GRASS 6.0.0 (spearfish60):~ > v.out.svg input=t_hydro output=/tmp/output.svg type=line precision=0
 100%
Extracted 2155 lines

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:gg="http:/grass.itc.it/2006/gg" viewBox="575000 -4939761 48817 51992">
<title>v.out.svg t_hydro /tmp/output.svg</title>
 <g id="G_Lines" fill="none" stroke="#000" stroke-width="52" >
  <path d="M 585998 -4927853 l 23 -36 22 -31 45 -44 40 -23 94 -11" />
  <path d="M 586223 -4927998 l 33 -4 50 -24 30 -38 50 -77 33 -23 9 -2" />
  <path d="M 586428 -4928165 l 57 -12 114 -9 36 5 56 -13 28 -28 60 -100 48 -57 15 -46 -0 -20" />
  <path d="M 586840 -4928446 l 5 -43 7 -20 23 -23 91 -20" />
  <!-- more paths follow -->
 </g>
</svg>