Nelson,
Attached is an image of the symbols we built for our public works storm drain utilities. The break down of the symbols used are as follows:
Manhole
Font: ESRI AMFM Water / Unicode: 50 / Size: 12
Font: ESRI Default Marker / Unicode: 33 / Size: 4.8
Font: ESRI Default Marker / Unicode: 34 / Size: 4.8
Junction Box
Font: ESRI SDS 2.00 2 / Unicode: 193 / Size: 12
Font: ESRI Default Marker / Unicode: 34 / Size: 12
Drop Inlet:
Font: ESRI Default Marker / Unicode: 84 / Size: 11
Font: ESRI Default Marker / Unicode: 34 / Size: 10.5
Curb Inlet:
Font: ESRI Climate & Precipitation / Unicode: 66 / Size: 5.76
Font: ESRI AMFM Sewer / Unicode: 63 / Size: 11.5
Font: ESRI Default Marker / Unicode: 34 / Size: 7.25
Storm pipes are thick dashed white/blue line with arrows; this differentiates it from the water & sewer mains. As you can see in the attachment we colored public utilities light blue and private utilities orange.
I hope this helps!
-Joshua