Water Quality B/C

[2win]

I can't seem to find much information or good photos for blood midge. Is it like a red worm, or is that just its larvae?

That's just the larvae. The blood midge adult is this I think...

http://gormanflyfishing.com/MidgeAdultWFly0735smlr.jpg

[rab 666]

I think the blood midge is actually the midge's larvae.

[ptkid]

I can't seem to find much information or good photos for blood midge. Is it like a red worm, or is that just its larvae?

I'm pretty sure a blood midge is just a midge larva that turns red when subjected to low oxygen conditions so thats how it shos pollution tolerance. I may be wrong though.

[jayadh]

i just sent an unocupied builder to build a salinometer (the complex one) hopefully that happens

[cngu23]

i just sent an unocupied builder to build a salinometer (the complex one) hopefully that happens

complex as in circuit/electrical current?

what should we know about sediment pollution? Does that basically refer to erosion?

[alecfxl]

i just sent an unocupied builder to build a salinometer (the complex one) hopefully that happens

complex as in circuit/electrical current?

Our kids have asked about the salinometer. I saw no clarifications on soinc and a search brought up only someone mentioning graduated cylinders. So our question is if this portion of the event has everyone testing out of the same public container or can the students ask for some solution to place into their own containers for testing?
For div C, there was also the question of whether circuits and/or multimeters can be used. The official clarifications state that there's no restriction on the type of as long as it is constructed by the team. Does that forbid any use of multimeters? Competition is around the corner so it'd be great to get some responses from knowledgeable people soon. I've also submitted the question to soinc but they usually take very long to answer.

[2win]

Our kids have asked about the salinometer. I saw no clarifications on soinc and a search brought up only someone mentioning graduated cylinders. So our question is if this portion of the event has everyone testing out of the same public container or can the students ask for some solution to place into their own containers for testing?
For div C, there was also the question of whether circuits and/or multimeters can be used. The official clarifications state that there's no restriction on the type of as long as it is constructed by the team. Does that forbid any use of multimeters? Competition is around the corner so it'd be great to get some responses from knowledgeable people soon. I've also submitted the question to soinc but they usually take very long to answer.

At our regionals, they had us put our salinometers into their container of sample water. They used graduated cylinders though, and so everyone's meters were able to fit; the water level was relatively high, too, so even if a meter could not fit in a graduated cylinder, it could reach the water to test.

I'm pretty sure you can use a multimeter, BUT it must be built by the team, not prebuilt. We were going to make one, because we had lots of help in the electrical engineering area, but it was going to be hard to calibrate, so we decided against it.

My salinometer was pretty bad looking (calibration wise, like, the circles I drew around the tube were kind of crooked...), but I was accurate and precise, and practiced with it lots, so we were on the dot. :3

[ptkid]

i just sent an unocupied builder to build a salinometer (the complex one) hopefully that happens

complex as in circuit/electrical current?

Our kids have asked about the salinometer. I saw no clarifications on soinc and a search brought up only someone mentioning graduated cylinders. So our question is if this portion of the event has everyone testing out of the same public container or can the students ask for some solution to place into their own containers for testing?
For div C, there was also the question of whether circuits and/or multimeters can be used. The official clarifications state that there's no restriction on the type of as long as it is constructed by the team. Does that forbid any use of multimeters? Competition is around the corner so it'd be great to get some responses from knowledgeable people soon. I've also submitted the question to soinc but they usually take very long to answer.

I think it just matters what the proctor counts a homebuilt. When I used an already made multimeter I found no correlation between anything.

[jayadh]

i just sent an unocupied builder to build a salinometer (the complex one) hopefully that happens

complex as in circuit/electrical current?

yes as in electric current I found a really good one by googling salinometer plans and I hope it gets done because it'll be much more accurate than the normal clay one

[cngu23]

i just sent an unocupied builder to build a salinometer (the complex one) hopefully that happens

complex as in circuit/electrical current?

yes as in electric current I found a really good one by googling salinometer plans and I hope it gets done because it'll be much more accurate than the normal clay one

If you're referring to this one, http://xellers.wordpress.com/electronic ... alinometer, it seems fairly complicated to build.
Also, from 2win's post
"At our regionals, they had us put our salinometers into their container of sample water. They used graduated cylinders though, and so everyone's meters were able to fit; the water level was relatively high, too, so even if a meter could not fit in a graduated cylinder, it could reach the water to test."
I believe that the circuit salinometer above requires a slight heating of the water sample. If everyone is testing from the same source, is your device allowed to modify the conditions of the water?