Date: Wed Dec 8 08:40:41 1999
Posted By: David Kopaska-Merkel, Staff Hydrogeology Division, Geological Survey of Alabama
Area of science: Environment
ID: 944583258.En
Message:
Noor:
The pH of stream water varies both in space and time. You should
always expect to find differences in the chemical characteristics of stream
water when you sample at different times and different places. This is
because many factors influence pH and other parameters, and these factors
vary over time and in space. For instance, stream water is composed of a
mixture of ground water that seeps into the stream bed or comes from
springs, water from tributary streams, direct precipitation from the air,
and runoff from precipitation that falls in the stream's watershed. All of
these different waters have differing pH values, and the relative
proportions of the different waters vary -- this alone guarantees that the
stream water cannot have a constant pH. Ground water flow is relatively
constant, but ground water is recharged by precipitation, so shallow
sources of ground water diminish during drought. If you visit a spring
regularly and measure the flow, you will find that the amount of water
is different every day, and the flow some days can literally be
thousands of times greater than on other days. Also, the pH of the ground
water itself can change for various reasons, albeit rather slowly.
Rainfall has a different pH than ground water (and it varies from time to time
depending on the kinds and amounts of natural and human-generated
pollutants in the atmosphere). Right after a rain on the water the pH falls
because rain water is more acid than most ground water. The more rain, the
more the pH falls. If rain falls on tributaries, their pH values change and
so do their flow rates. So depending on where rain falls in the watershed
it will have a varying effect on the pH in a particular stream in a
particular spot. If rain falls on the land, it picks up minerals from the
soil, so when that water enters the stream, its pH has already changed. If
rain falls on the land in different places, it finds different soils, so
its pH may change by different amounts. I hope you understand now that pH
inevitably varies in stream water.
There are many sources of information about stream water quality. The
Geological Survey of Alabama has published more than 300 reports about
water in our state, and our list of publications is on our web site
(www.gsa.state.al.us). The premier
agency responsible for water research in the U.S. is the U.S. Geological Survey:
U.S. Geological Survey Water Resources Division. The USGS is the lead
federal agency in all areas of water research. Telephone: (800) 426-9000.
E-mail: h2oinfo@usgs.gov; Web site:
http://water.usgs.gov
The second most important federal agency for water research is the U.S.
Environmental Protection Agency:
U. S. ENVIRONMENTAL PROTECTION AGENCY
National Agriculture Compliance Assistance Center (Ag Center), toll-free,
automatic "fax-back" system for fact sheets and other publications:
1-888-663-2155 (new telephone number). The list includes information on
pesticides, underground storage tanks, animal feeding operations, and other
subjects.
- American Heritage Rivers initiative Web site:
http://www.epa.gov/docs/owowwtr1/heritage/index.html
- American Heritage Rivers toll-free hotline: 1-888-40-RIVER
Clean Water Initiative Web site:
http://www.cleanwater.gov/
- Conservation guidelines Web site:
http://www.epa.gov/owm/genwave.htm or
contact Safe Drinking Water Act Hotline.
- Drinking water information Web site (data from local systems):
http://www.epa.gov/safewater/dwinfo.htm
- Hardship Grants Program for Rural Communities Web site:
http://www.epa.gov/OWM/wm042002.htm
- Hardship Grants Program for Rural Communities: (202) 260-2268
- National Center for Environmental Publications and Information, PO Box
42419, Cincinnati OH 45242. Telephone: (800) 490-9198. Web site:
http://www.epa.gov/ncepihom
- Nonpoint Source e-mail discussion list (NPSINFO) Web site: send message
"subscribe NPSINFO (your firstname, last name)" to
listserver@unixmail.rtpnc.epa.gov
- Nonpoint Source Water Pollution Control. The USEPA has published a study on
state laws and regulations that can be used to address nonpoint source
pollution. Web site:
http://www.epa.gov/OWOW/NPS/elistudy
- Nonpoint Source success stories Web site:
http://www.epa.gov/OWOW/NPS/Success319
- Pollution Prevention Information Clearinghouse: (202) 260-1023. E-mail to
ppic@epamail.epa.gov
- Safe Drinking Water Act Hotline: (800) 426-4791
- Safe Drinking Water Act information Web site:
http://www.epa.gov/OGWDW/ or
http://www.epa.gov/OGWDW/SDWAsumm.html
- Source water protection Web site:
http://www.epa.gov/OGWDW/swp/swapes.html
- Superfund Web site:
http://www.epa.gov/superfund/index.htm
- Superfund, RCRA, UST, oil pollution, and community right to know hotline:
(800) 424-9346
- Superfund, RCRA, UST, oil pollution, and community right to know hotline
Web site:
http://www.epa.gov/epaoswer/hotline/index.htm
- Surface Water Treatment Rule, guidance for small systems, telephone: (800)
426-4791 or on the Web:
http://www.epa.gov/ogwdw/regs/swtrlist.html
- Total Maximum Daily Load (TMDL) program of the Clean Water Act Web site:
http://www.epa.gov/owowwtr1/tmdl/index.html ; telephone: (202) 260-7074
- Underground Storage Tank upgrade/replacement/closure costs Web site:
http://www.epa.gov/swerust1/1998/urccosts.htm
- USEPA Web site: http://www.epa.gov
- Wastewater (National Small Flows Clearinghouse) hotline: (800) 624-8301
Wastewater (National Small Flows Clearinghouse) Web site:
http://www.nsfc.wvu.edu
- Wastewater (small systems) Web site:
http://www.epa.gov/OWM/smcomm.htm
Watersheds (Surf Your Watershed Program) Web site:
http://www.epa.gov/surf
or call (202) 260-7087. Water-quality and other information about
watersheds throughout the US is available on this web page.
In addition,
USEPAs Office of Water has recently published a new document entitled
"Catalog of Federal Funding Sources for Watershed Protection," which is
available by telephone at (513) 489-8190 or (800)490-9198 and fax
(513)489-8695. Please include the document number (EPA841-B-97-008) in
requests. A new service of the USEPA, the Index of Watershed Indicators, is
available on the Web at:
http://www.epa.gov/surf/iwi/ . The IWI summarizes
available water-quality information and other environmental information for
every watershed in the country. A related page is the watershed
information network, Web site:
http://www.cleanwater.gov/win
Wellhead Protection Document List Web site:
http://www.epa.gov/OGWDW
Both of these agencies have extensive educational outreach programs that
include information about surface-water quality.
Best of Luck with your project!
David Kopaska-Merkel
Geological Survey of Alabama
PO Box 869999
Tuscaloosa AL 35486-6999
(205) 349-2852
FAX (205) 349-2861
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