The lake level is indeed low, but the idea that we should not plan for future growth until it rains is impractical.
Does this mean that if it rains like hell we can start building? What if the rain stops? What if we put a moratorium on building, then it starts raining again? What if it then stops?
The numbers tell the story:
The lake holds about 1,000,000 acre feet of water.
Folsom uses 20,000 to 22,000 of their allotted 33,000.
The new development, I believe, will use about 7,000.
So, at best, if the lake were full and all of the homes were built and occupied, we'd be using less than 3% of the water that flows into t he lake.
If the homes don't get built, we'd using about 2% of the water.
There are could be lots of reasons one might oppose the development south of 50, including crowding, pollution, changing the character of the community, destruction of beautiful open space, hatred of developers, and maybe more, but to say that 'we don't have the water' isn't really the case today.
As bad as the lake is right now, Folsom still uses only a small portion of it.