set your marker up with a boom on the lead of say 6inches.If it pops up ok then you know the weed is not much deeper than this and is not too bad. Weed can be very deceiving especially when trying to ascertain its length and severity with a rig and lead on.
Weed of just a few inches can appear to be solid until you put a marker on it. Just play about with the marker and you will build up a picture in your minds eye. If the weeds not much deeper than 6 inches I have done ok with a 2 inch chod, and even when I have found thicker weed I have still got pick ups with this setup.
Fish will feed really hard in weed and its not something to be afraid of.If you use the chod set your top bead at least 18 inches up the leader, cast in then tighten up very slowly allowing the leader to cut its way through the weed thus aiding presentation.
Trust me if theres natural in the weed get a rig in there you will be pleasantly surprised(thats what I have found on one water at least)