Archive for the ‘oakland water’ Category

Radio Beach

8 November 2011

Radio Beach is Oakland’s nearest thing to a natural beach. It’s city land, on the north side of the Bay Bridge approach past the toll plaza. There is no lonelier or prettier spot on Oakland’s waterfront. This is the view toward the bridge as you enter the beach.

radio beach

This was near low tide yesterday, and the mudflats stretching all the way to Emeryville were tempting. Here’s the view back from the other end, with some of the radio towers.

radio beach

And here’s the view out, with Mount Tamalpais, Angel Island and the Tiburon Peninsula on the skyline. Click the image for a 1000 pixel version.

radio beach

The sand is very fine grained, given the energy of the waves and the available sediment in the Bay. It collects here where a little extra wave energy gets focused, against the buttress of the bridge approach. Not a super beach, but a real one.

Oakland groundwater

11 March 2011

groundwater

I’ve been taking National Ground Water Awareness Week to think a little more than usual about groundwater. My KQED Quest blog post yesterday, on Bay area groundwater, mainly focused on the South Bay. Oakland’s not a big groundwater town.

The rancheros and early Anglo settlers here all dug wells, of course. As I understand it, Dunsmuir House still has an operating well, the Pardee Home has a water tower that suggests the presence of a well, and some of the other old properties must have them too. Some long-standing Oakland industries probably have wells, and maybe the golf courses too. I don’t know a lot about it.

But municipal water service from Oakland’s earliest days exploited local surface water, starting with Temescal Creek and ending with San Leandro Creek (see the two dams post). Lion Creek supplied laundries in the area near Mills College once called Laundry Canyon. Today we’re all served by East Bay MUD with clean Sierra runoff from the Mokelumne River watershed. In Oakland, surface water rules.

Today groundwater is off the radar here. Sure, we have to clean it up where old gas-station tanks used to leak—this monitoring well is from one of those. It seems to me that the aquifer west of Chabot Dam, in the alluvial fan crossed by San Leandro Creek in far East Oakland, must have good potential, and so would Fruitvale and Temescal. San Francisco is opening up its formerly used aquifers to serve emergency purposes; we ought to look into that too. Why go to such expense to clean up the groundwater and not get some sustainable use out of it at the same time?

Bird islands

13 January 2011

Lake Merritt is formally a wildlife sanctuary, declared in 1870, but the land itself is artificial and needs maintenance.

artificial land

The Parks and Recreation Department website says that the first bird island was built in 1925 and the other four were added in 1956. As long as I can recall (since 1989) they have been a tangle of thick foliage and tall snags, but right now the islands are undergoing a makeover. Anyone have more information?

Water underground

4 January 2011

In today’s Chronicle, the Oakland writer Jon Carroll was musing about fire: “Usually it’s an obedient little creature, about the size of a cocker spaniel—until one day it turns into the largest, meanest cocker spaniel on Earth, and there goes the house.” Water, another of the four ancient elements, is the same way.

water main burst

Water is great in metered doses, delivered by tank and faucet. But “water dissolving, water removing” is no tamer than fire. Some time you should see firsthand what keeps it constrained: giant dams and stout mains, treatment plants, intricate feeder lines. The antique examples of dams and treatment facilities in Oakland are not the state of things today. Every now and then something breaks, like this line under Santa Clara Avenue in 2005, and a hint of chaos leaks out.

Last week a handyman had our water turned off for most of the day, with no word about when he would finish. As sunset approached we panicked enough to go out and buy 48 pounds of jugged water. But we didn’t need to use most of it. And so another bit of our earthquake preparedness is in place, a little lurch of progress. After the next big-enough one there will be water, water everywhere.

The ancients had a handle on things with their notion of four elements. Fire and water are worthy of the status, both full of motion and power. As for air, every weather report vouches for it. But it took someone more observant than most of us to see earth the same way and sum it all up as panta rhei, everything flows.

Drainage

18 December 2010

Oakland is a fine town unless it rains too much. Then we have to worry about all the water.

drainage

All things considered, Oakland’s landscape would prefer to be steep, forested hills raised by tectonics along the Hayward fault and gentle coastal plains that absorb the sediment washed off those hills. It’s a rich recipe that produces redwoods in the heights and forage and fruit in the vales. But with impervious roads and homes carpeting the upper slopes, we increase the runoff and undermine our own infrastructure. People like the homeowners above Broadway Terrace run flexible plastic lines over the edge of their properties to put the problem out of mind. But if you walk the road, you’ll find fresh gullies that will work their way uphill to the source of the problem regardless. Landslides will probably follow.

Big Rock

27 September 2010

I was at Temescal Regional Recreation Area yesterday—you probably call it Lake Temescal—and was happy to spot one of my favorite places.

big rock

This big hunk of Franciscan something-or-other sits near the head of the lake, displaying the ugly attractiveness that the French call jolie laide. Not a hundred feet away runs the Hayward fault, and there’s a free-running stream here too. Some classic oak trees shade picnic tables, and you can even swim where fish can nibble your toes.

Big Rock is the place I used to illustrate my post “Leave the Stone Alone.” Because for some reason, people seem to respect Big Rock.

San Leandro Creek (3)

25 July 2010

San Leandro Creek supplies almost all of the water in Lake Chabot. Here’s where it enters the reservoir, at its farthest eastern end.

lake chabot

San Leandro Creek is one of only three streams that cross the East Bay hills. The other two are San Lorenzo Creek, which cuts through Castro Valley and Hayward, and Alameda Creek, which traverses Niles and Fremont.

Since Anthony Chabot built the dam in the 1870s, the creek has dumped sediment and filled in about a mile of its course, creating new level land until today it’s slowly encroaching into the lake itself. Willow Park Golf Course is built on that land.

Not much sediment comes into the lake today, now that Upper San Leandro Reservoir has dammed the creek about four miles upstream. The round pads of aquatic vegetation flank the stream channel, which runs between low, muddy banks that were underwater when I visited last month. I think the vegetation traps sediment, which supports more vegetation, so that the patches tend to grow into a circular shape, reminiscent of bacterial colonies on a petri dish.

The first two ridges in this photo are underlain by the Joaquin Miller Formation, which extends along the whole south shore of the lake between here and the park headquarters. It’s mostly shale with a few large sandstone beds, tilted steeply upward. The farther ridges are all Oakland Conglomerate, and they stand maybe 50 meters higher. They look more sparsely vegetated, which may reflect the bedrock but might just as easily be due to historic land uses.


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