Unfortunately many people are missing the point here. With climate change, even if this is only temporary for a century or two, we, in California and other western US states that depend on snow pack, will be losing our best and least expensive surface water storage -- the snow pack. This is a wonderful reservoir. I holds tremendous amounts of water which it releases at a usable rate in late spring and summer when we need it most.
With climate change the precipitation will be in the form of rain which will runoff quickly. Runoff hydrographs will have higher peaks and the peaks will occur earlier in time. We don't have the current surface storage to capture this before it causes downstream damage or is lost to the ocean. Subsurface storage is a very suitable alternative. But not all locations are suitable for subsurface storage. The geology has to be favorable and some form of conveyance is typically necessary to the location where it can be recharged. The California Delta is a great location to collect surface water, but the subsurface geology in that area precludes percolation due to the fine sediments that have been deposited over the eons. Another important factor with groundwater storage is avoiding places with contamination. Not easy to do these days. No one wants to put good water into bad water. But maybe the cost of treating the "mix" is still cheaper than surface storage. I'll buy that argument -- sometimes.
So, we need a means to move the water and places to park water temporarily until we can store it underground. This can be in the form of on-stream or off-stream storage. We can't be "anti-storage". It has a place in water supply.
The reason Southern California is in better shape during this current drought is the off stream storage created by the Metropolitan Water District (Eastside Reservoir) and the groundwater storage that is prevalent in Southern California.
Water recycling is an important part of the water supply portfolio also. But remember, with each use, the water picks up about 180 mg/L of TDS, getting saltier and saltier with each reuse cycle. Eventually we will need desalination. That's ok but we need to be ready to bite the energy and cost and carbon footprint bullet.
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Joseph Reichenberger P.E., F.ASCE
Professor of Civil Engineering
Monterey Park CA
(626) 288-5046
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Original Message:
Sent: 07-02-2014 03:53
From: D. Thangaraj
Subject: Water Storage
There were hectic activities on the construction of storage reservoirs throughout the world during 20th century.Most of the natural water resources were tapped and were filled in these reservoirs.Right from the start of the 21st century the interest towards the construction of dams and reservoirs is not appreciable.More storage requires more resources.Creating a reservoir in the 21st century is not an easy affair.Even with the Federal support,the situations will be highly twisting.That is why the interest in response is falling.If the proposal for the construction comes from the native citizens side,we may perhaps will be able to execute with lesser hurdles
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D. Thangaraj M.ASCE
Executive Engineer
Subramaniapuram TN
914371 235488
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Original Message:
Sent: 06-18-2014 16:57
From: Dudley McFadden
Subject: Water Storage
In western states like California we are always hearing about building more "storage" (that means dams and reservoirs) to solve water supply shortfalls. Building more storage in the 20th century brought more agricultural development, water-hungry tree crops, larger cities, and the ensuing dependency on those reservoirs. I hear colleagues advocating yet more storage. Honestly, more storage has got to be the worst response! It will only beget more dependency and future need for yet more storage. Anyone out there want to be even more dependent?
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Dudley McFadden P.E., D.WRE, M.ASCE
Principal Civil Engineer
Sacramento Municipal Utility District
Roseville CA
(916) 773-7174
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