Having used the USGS and NOAA data for many years and my limited background in WX data monitoring I'll also chime in with it's about what's coming down the river more so than the current conditions. Rains in the headwaters of the watershed usually take 48 - 72 hours to reflect on the gauge at LF. Localized heavy rains depending on intensity obviously have a varied local effect. (last week) To better judge what the levels will be I always check the gauges at points up stream. This link may help you in that regard.
While the Little Falls gauge is above the fall line and dam, it's position has not varied much since installed and provides many years worth of solid data points. The result is what creates the average level and flow we base most recreational use on.
On Wed, Jul 17, 2013 at 4:47 PM, Sardman <morpianesi@gmail.com> wrote:
nice how you can see the effect of the tides on the YSI monitoring overlapping with the rain.the USGS gauge is upstream of the Little falls dam, and is non-tidal. On top of that, the dam acts as a weir and the level elevation is proportional to the flow, not the same with measuring the level in the open river.thanks for sharing: it's useful to have a reading of turbidity and chlorophyll in the river, along with transmittance gives you a good idea of the conditions.M.
On Wednesday, July 17, 2013 12:52:58 PM UTC-7, TurbineBlade wrote:Oh, I meant to say -- check the readings before and after it rains and you'll think you're looking at completely different rivers ;).--Gene
On Wednesday, July 17, 2013 3:51:21 PM UTC-4, TurbineBlade wrote:I used to work for DDOE -- here is the real-time water quality units on the Potomac and Anacostia -- http://www.ysieconet.com/public/WebUI/Default.aspx?hidCustomerID=167The one over the Benning road bridge always gets clogged with debris and scuds -- usually when it goes off-line and you take the boat out to check on it, you can expect to knock hundreds of scuds and sometimes some sticks and trash out of the unit.The Potomac one usually has fewer problems since the river is larger and is less likely to get fouled up.Gene
On Wednesday, July 17, 2013 3:48:31 PM UTC-4, TurbineBlade wrote:Rain often has a very large impact on water temp, and also other parameters as well (turbidity is an obvious one in this region, but it can also affect pH, conductivity, etc. Actually, in the winter in DC, snowmelt and/or rain/sleet usually jacks the conductivity trememdously because of all the salt applied to the roads. It's insane how high the cond. gets on some of the small streams due to this.Gene
On Wednesday, July 17, 2013 3:35:06 PM UTC-4, Nedak wrote:Went to Lock 10 w. Mauro (fellow TPFRer) yesterday and we found the river to be high and muddy. He referred me to stream gauge for the Potomac for future reference.
http://waterdata.usgs.gov/md/nwis/uv?01646500
Note the dramatic temperature decrease July 11-12 almost 10 degrees.
Per http://www.nws.noaa.gov/climate/index.php?wfo=lwx
we did get 1.3 inches of rain at National so I figure its the rain.
Can someone confirm or educate me on correlation?
Thanks.
http://www.tpfr.org
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