Hi, and thanks for your medical question on eHealth forum!
The first possibility that comes to my mind that can cause a huge amount of clear vaginal discharge is pregnancy. Hence check and see whether you have missed a period or not. It is also possible that you are very close to your next due date of period, and likely to miss it as you are pregnant. Hence keep this option in mind.
The other possibility is that you are on some birth control pill that is causing excess discharge due to stimulation of the glands of cervix. If this is the case, changing the pill will help.
Non infective cervical lesion such as cervical erosion, chronic cervicitis, mucous polyp and ectropion (cervical glands are exposed to the vagina) may produce excessive secretion which pours out at the vagina.
The other possibilities are STD like gonorrhea and chlamydia, vaginal infections and prolonged use of tampons etc causing allergic reaction. There are many other causes of vaginal discharge but either they cause a foul smelling discharge or they cause an itch.
Since a confirmed diagnosis cannot be given on net please consult your gynecologist regarding this. Hope this helps. Take care!