ࡱ> JLI%` Tbjbj"x"x 48@@T\":(bbbbuuu'")")")")")")"$#h&xM"_qu__M"bbb"_bb'"_'"b. q |x"0"z&3z&z&uWXuuuM"M" uuu"____: :  Using Streamstats to Estimate Flow Statistics for Ungaged Sites in the United States Kernell G. Ries, U.S. Geological Survey StreamStats is a Web-based Geographic Information System (GIS) application that was created by the U. S. Geological Survey (USGS), in cooperation with Environmental Systems Research Institute, Inc. (ESRI), to provide users with access to an assortment of analytical tools that are useful for water resources planning and management. StreamStats allows users to easily obtain streamflow statistics, basin characteristics, and descriptive information for USGS data-collection stations and for user-selected ungaged sites. It also allows users to identify stream reaches that are upstream and downstream from user-selected sites, and to identify and obtain information for locations along the streams where activities that may affect streamflow conditions are taking place. This functionality can be accessed through a map-based user interface that appears in the users Web browser, or individual functions can be requested remotely as Web services by other Web or desktop computer applications. StreamStats can estimate streamflow statistics for ungaged sites either on the basis of regional regression equations or on the basis of the known flows for nearby streamgaging stations. Estimates of streamflow statistics that are obtained from regression equations are based on the assumption of natural flow conditions at the ungaged site. If human activities such as dam regulation and water withdrawals substantially affect the timing, magnitude, or duration of flows at a selected site, then the regression-equation estimates provided by StreamStats should be adjusted by the user to account for those activities. Users should understand that there are errors associated with estimates determined from available data for the stations as well as estimates determined from regression-equations, and some disagreement between the two sets of estimates is expected. If the flows at the stations are affected by human activities, then users should not assume that the differences between the data-based estimates and the regression-equation estimates are equivalent to the effects of human activities on streamflow at the stations. When StreamStats is used to obtain regression-equation estimates for sites with basin characteristics outside the ranges of the basin characteristics for the stations used to develop the regression equations, the estimates are extrapolated. Errors associated with these estimates are unknown and may be very large. StreamStats provides a warning when extrapolation occurs. StreamStats was designed such that each state would be implemented separately, with a reliance on local partnerships to fund the individual applications, and a goal of eventual full national implementation. Idaho became the first state implemented in 2003. By mid-2007, 10 states had applications available to the public and 21 other states were in various stages of preparation for implementation. The table below indicates statistics that can be estimated for ungaged sites in each state. In addition, StreamStats provides access to published streamflow statistics, basin characteristics, and descriptive information for USGS data-collection stations throughout the Nation. Information that is available varies substantially among stations. StateAvailable Statistics for Ungaged SitesColorado2- through 500-year floods; annual and monthly mean flows; 7-day 2-, 10-, and 50-year low flowsConnecticut2- through 500-year floodsDelaware2- through 500-year floodsIdaho2- through 500-year floods; annual mean flow; 20-, 50-, and 80-percent exceedance flows for each monthIllinois2- through 500-year floodsIndiana2- through 500-year floods; 7-day 2-, and 10-year low flowsMaryland2- through 500-year floods; 7-, 14, and 30-day low flows at 2-, 10-, and 20-year recurrence intervals for limited area of state, to be expanded within 18 monthsMassachusetts99- through 50-percent exceedance flows at selected percentiles; August median; 7-day, 10-year low flowOhio2- through 500-year floods; annual and monthly mean flows; 25-, 50-, and 75-percent nonexceedance flowsOregon2- through 500-year floods, with many other flow statistics coming soonPennsylvania7-day 2-, and 10-year low flows; 30-day 2-, and 10-year low flows; 90-day, 10-year low flows; mean annual flows; harmonic mean flows; 10-, 25-, and 50-year base flows; peak flows coming soonTennessee2- through 500-year floods; 3-day 2-, 10-, and 20-year low flows; 7-day, 10-year low flowsVermont25-, 50-, and 75-percent exceedance flowsWashington2- through 500-year floods For further information, please visit  HYPERLINK "http://streamstats.usgs.gov/" http://streamstats.usgs.gov/ and  HYPERLINK "http://water.usgs.gov/osw/programs/streamstats.html" http://water.usgs.gov/osw/programs/streamstats.html. ?TUV a b c RWHIJ9:gde¸¸¸®®¸¸¸—xtpejhY)hY)UhY)h3 ahY)h3 a5\ hY)h3 ahB*hB*OJQJ^Jh3 aOJQJ^JhY)hOJQJ^JhOJQJ^JhY)OJQJ^JhY)hY)OJQJ^JhY)hY)6 hY)hY)hB*>*CJOJQJ^JaJ#hY)hY)>*CJOJQJ^JaJ%UV~b c IJ9:gdB* h]`hgd<<]`gd]gd $]a$gd]gd $$]a$gdT:@ghqakd$$Ifl0='& L'644 la]pyt3 a $If]gd0akd$$Ifl0='& L'644 la]pyt3 a $If]gdakd$$Ifl0='& L'644 la]pyt3 a%0akd$$Ifl0='& L'644 la]pyt3 aakdE$$Ifl0='& L'644 la]pyt3 a $If]gdakd$$Ifl0='& L'644 la]pyt3 a $If]gd0akd9$$Ifl0='& L'644 la]pyt3 a $If]gdakd|$$Ifl0='& L'644 la]pyt3 a0akd$$Ifl0='& L'644 la]pyt3 aakd$$Ifl0='& L'644 la]pyt3 a $If]gdakdp$$Ifl0='& L'644 la]pyt3 a $If]gd  0akd$$Ifl0='& L'644 la]pyt3 a $If]gdakd-$$Ifl0='& L'644 la]pyt3 a<=Hcd0akdd $$Ifl0='& L'644 la]pyt3 aakd $$Ifl0='& L'644 la]pyt3 a $If]gddeT]gdQRSTj hY)hY)U hY)hY)hY)hY)hY)0JjhY)hY)Uj! hY)hY)U21h:pB*/ =!"#$% $$If]!vh55y #v#vy :V lL'655 9/ / /  / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / / a]pyt3 a$$If]!vh55y #v#vy :V lL'655 9/  / / /  a]pyt3 aDyK http://streamstats.usgs.gov/yK :http://streamstats.usgs.gov/EDyK 4http://water.usgs.gov/osw/programs/streamstats.htmlyK hhttp://water.usgs.gov/osw/programs/streamstats.html@@@ NormalCJ_HaJmH sH tH Z@Z 3 a Heading 1$<@&5CJ KH OJQJ\^JaJ DA@D Default Paragraph FontRi@R  Table Normal4 l4a (k(No ListjOj Y)Default 7$8$H$5B*CJOJPJQJ^J_HaJmH nHphsH tH6U@6 Y) Hyperlink >*B*phT8UV~bcI J 9 : @ g h q %  <=HcdeV000000000000000000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000~J 9 @ g h q %  <=HcdeVJ004HH003J008 ةJ00J00[J00[J00J00[J00[J00J00[J00[J00J00[J00[J00J00[J00[J00J0 0VJ0 0VJ00J0 0VJ0 0VJ00J00VJ00VJ00J00VJ00VJ00J00VJ00VJ00J00VJ00VJ00J00VJ00VJ00J00J00J00J00J00J00J00 J00 H00H0<0J00J00T:dTTQTXXl,b$kOrgoi?KFK1j@0(  B S  ?T"01G01G01\H01H01H01I01\I01I01I01\@01=01B01J01@01014010101l0101l01l01,0101d01t>01>014?01>0160160101,01ԉGGgg  h h   ==V      !TTkk  p p $$GGV  !9*urn:schemas-microsoft-com:office:smarttagsStateB!*urn:schemas-microsoft-com:office:smarttagscountry-region9"*urn:schemas-microsoft-com:office:smarttagsplace x>"!"!"""""""""""""""V]cn  J U I T lvr+5VVaVV` 9 : @ h q % dVV";joN !3?6UhQYk! 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