Over the years with many Vegas and leaks on the drivers side, you may want to check above the rubber grommet that Cosvega76 mentions. You can feel all the way to that grommet through the upper cowel. I have had my driver side floor board filled with water that ran down the hood release handle during a single heavy rain. The hard plastic cable sheathing with age will crack where it makes a 145 degree turn inside the cowel cavity before that rubber grommet. The way it is designed, water will travel down that sheathing into the crack and follow the cable to the release handle. Beside the lower cavity in the fender cowel being filled with debris, I would also check that cable.
It happened on three different Vegas that I had owned. I repaired them back then by replaceing the cable, and later on with out spare parts, I pulled the cable out and used electrical shrink tubing over the crack which also seemed to work out fine.
Jimhttp://blog.hemmings.com/index.php/2007 ... ves-vegas/
1973 Vega GT Hatchback (Millionth Vega)
1975 Vega GT Kammback (Nomad modification)
1976 Vega GT Hatchback (stock)
1976 Vega Cosworth (white/white, stock)
1977 Vega Estate (stock)
1977 Vega Hatchback (stock, bought new)
2011 Ford Ranger XLT (2,3 twincam 5spd std)
2000 Ford ranger XLT (2,5L 5spd std)
2003 Chevrolet Tracker (LT)
2015 Chevrolet Trax LTZ AWD