Recent updates to USGS StreamStats application for North Carolina

Transcription

1 J. Curtis Weaver, Hydrologist USGS South Atlantic Water Science Center (Raleigh) Recent updates to USGS StreamStats application for North Carolina U.S. Department of the Interior U.S. Geological Survey Presented to: 2016 Water Resources Research Institute annual conference Jane S. McKimmon Center, Raleigh, NC March 18, 2016 Presentation outline Overview of USGS StreamStats Recent updates to NC application Demo of StreamStats application and basic features Q & A 2 1

2 Remember them good ol days? 3 StreamStats is: What is StreamStats? A Web-based GIS application created by the USGS to provide users with an assortment of analytical tools useful for water-resources planning and management. Initially developed for NC in cooperation with NCDOT Hydraulics Unit (initial release to public in June 2012) StreamStats does: Makes the process of computing basin characteristics and streamflow statistics (flood-frequency statistics) for ungaged locations faster, accurate, and consistent. 4 2

3 With StreamStats You Can: Easily obtain streamflow statistics, basin characteristics, and descriptive information for USGS data-collection stations User-selected ungaged locations Delineate the drainage-basin boundary Summarize basin characteristics Estimate streamflow statistics (flood-frequency for NC) 6 Updates to interface Initial release June 2012 (Version 2 interface) Version 3 interface released July 2015 Beta Version 4 release very, very imminent Fully-functional Version 4 a few weeks after that 7 3

4 North Carolina StreamStats Currently uses: 30 ft pixel Digital Elevation Models (DEMs) based on LiDAR Combination of local resolution streams (NC Stream Mapping) high resolution National Hydrography Datasets (NHD). NHD is a comprehensive set of digital spatial data representing the surface water of the United States using common features such as lakes, ponds, streams, rivers, canals, and oceans. 9 So just how accurate are those stream lines? The stream lines a combination of: local resolution streams (~ 1:4,800) for 19 counties in western NC, and 1:24,000 scale National Hydrography Datasets (NHD) Digitized NHD streams reflect accuracy of the paper topographical quad maps Seamed at the boundaries between 2 regions 11 4

5 StreamStats links USGS StreamStats (national page) USGS StreamStats in North Carolina tml User instructions (version 3): ructions (1).pdf Or one can simply Google search on NC StreamStats 13 Two StreamStats Fact Sheets StreamStats: A Water Resources Web Application (Ries and others, 2008) StreamStats in North Carolina: A Water-Resources Web Application (Weaver and others, 2012)

6 Recent updates to NC application Computation of urban/small rural floodfrequency techniques based on Feaster and others (2014, USGS SIR ) Available for Piedmont, Sand Hills, and Coastal Plain Blue Ridge still based on Robbins and Pope (1996) Example to follow shortly 15 Recent updates to NC application Available at-site low-flow characteristics and flow-duration statistics for selected continuous-record streamgages across North Caroline, based on Weaver (2015, USGS SIR ) Update to StreamStatsDB Statewide 16 6

7 Query Streamgages Exploration Tools Streamgage of interest 17 Query Streamgages Open and select Query Streamgages Use cursor to select streamgage of interest 18 7

8 Query Streamgages Select StreamStats Gages page: link in pop-up box 19 StreamStats Gage page report Links to flow-duration statistics by water years, POR, calendar day and month, and selected seasonal periods 20 8

9 StreamStats Gage page report Low-flow and mean, min, max flow statistics 21 StreamStats Gage page report POR flow-duration statistics(above) Report citation (below) 22 9

10 Recent updates to NC application Addition of 2011 National Land-Cover Database 2011 ( In cooperation with NCDEQ Division of Water Resources Update to application that allows users to compute 2011 land-cover characteristics for delineated basins (Statewide). 1992, 2001, 2006, and 2011 Example to follow shortly basin characteristics DRNAREA Area that drains to a point on a stream OUTLETELEV Elevation of the stream outlet in thousands of feet above NAVD88. ELEV Mean Basin Elevation MINBELEV Minimum basin elevation ELEVMAX Maximum basin elevation BSLDEM30FT Mean basin slope, based on slope percent grid from DEM with 30 foot pixels BASINPERIM Perimeter of the drainage basin as defined in SIR CSL10_85fm Change in elevation between points 10 and 85 percent of length along main channel to basin divide divided by length between points ft per mi 8 physical measures 24 10

11 53 basin characteristics (con t) PCTREG1 Percentage of drainage area located in Region 1 PCTREG2 Percentage of drainage area located in Region 2 PCTREG3 Percentage of drainage area located in Region 3 PCTREG4 Percentage of drainage area located in Region 4 PCTREG5 Percentage of drainage area located in Region 5 PRECIP Mean Annual Precipitation I24H50Y Maximum 24-hour precipitation that occurs on average once in 50 years SSURGOA Percentage of area of Hydrologic Soil Type A from SSURGO SSURGOB Percentage of area of Hydrologic Soil Type B from SSURGO SSURGOC Percentage of area of Hydrologic Soil Type C from SSURGO SSURGOD Percentage of area of Hydrologic Soil Type D from SSURGO Used in floodfrequency computations 5 hydrologic regions (FF), 2 precip, and 4 soils basin characteristics (con t) PROTECTED Percent of protected Federal and State owned land within the basin LU92BARE Percent Barren from NLCD1992 LU92DEV Percent Developed from NLCD92 LC92FOREST Percentage of forest from NLCD 1992 classes LU92PLANT Percentage of planted area from NLCD 1992 classes 81 and 82 LU92WATER Percent Water from NLCD1992 LU92WETLN Percent Wetland from NLCD1992 Protected lands, 1992 land-cover (6) 26 11

12 53 basin characteristics (con t) LC01BARE Percentage of area barren land, NLCD 2001 category 31 LC01CRPHAY Percentage of cultivated crops and hay, classes 81 and 82, from NLCD 2001 LC01DEV Percentage of developed land-use from NLCD 2001 classes LC01FOREST Percentage of forest from NLCD 2001 classes LC01HERB Percentage of herbaceous upland from NLCD 2001 class 71 LC01IMP Percentage of impervious land cover from NLCD 2001 LC01SHRUB Percentage of shrub / scrub from NLCD 2001 class 52 LC01WATER Percentage of open water, class 11, from NLCD 2001 LC01WETLND Percentage of wetlands, classes 90 and 95, from NLCD land-cover (9) basin characteristics (con t) LC06BARE Percentage of barren from NLCD 2006 class 31 LC06PLANT Percentage of planted area from NLCD 2006 classes 81 and 82 LC06DEV Percentage of developed land-use from NLCD 2006 classes LC06FOREST Percentage of forest from NLCD 2006 classes LC06GRASS Percentage of grassland from NLCD 2006 class 71 LC06IMP Percentage of impervious area determined from NLCD 2006 impervious dataset LC06SHRUB Percentage of shrub / scrub from NLCD 2006 class 52 LC06WATER Percent of open water, class 11, from NLCD 2006 LC06WETLND Percentage of wetlands, classes 90 and 95, from NLCD land-cover (9) 28 12

13 53 basin characteristics (con t) LC11BARE Percentage of barren from NLCD 2011 class 31 LC11CRPHAY Percentage of cultivated crops and hay, classes 81 and 82, from NLCD 2011 LC11DEV Percentage of developed land-use from NLCD 2011 classes LC11FOREST Percentage of forest from NLCD 2011 classes LC11GRASS Percentage of grassland from NLCD 2011 class 71 LC11IMP Percentage of impervious area determined from NLCD 2011 impervious dataset LC11SHRUB Percentage of shrub / scrub from NLCD 2011 class 52 LC11WATER Percent of open water, class 11, from NLCD 2011 LC11WETLND Percentage of wetlands, classes 90 and 95, from NLCD 2011 User tip during heavy network traffic for large basins, it may help to compute characteristics in groups, not all at once land-cover (9) 29 Demo of StreamStats (live or static) Version 4 URL available upon public release Version 3 _carolina.html 30 13

14 Opening screen (Version 4) 31 Zoom closer to NC 32 14

15 Streams visible at level Find point of interest and delineate 34 15

16 Delineating while you wait 35 Delineation complete and visible 36 16

17 Select basin characteristics 37 Select all or some of interest 38 17

18 Hit Continue to compute 39 Computing while you wait 40 18

19 Done you can Build a Report 41 Enter report title comments 42 19

20 Click Print to send to destination 2011 land-cover characteristics Also, available options to download basin (shapefile or ESRI GDB) or.csv file of characteristics 43 Estimate flood-frequency statistics Pending full functionality of NC application in Version 4 interface, will need to continued use of the Version 3 interface to compute the FF statistics for a point of interest

21 Delineate basin (Version 3) Watershed Delineation from a Point 45 Click on the point of interest 46 21

22 Delineated basin Click Compute Basin Chars button to start Select all or some characteristics of interest (must be completed before flood-frequency statistics can be computed for point of interest) Compute Basin Characteristics 47 Computed characteristics 48 22

23 Compute flood-frequency statistics Click Compute Flows button to start Select rural and(or) urban flows Compute Flow Statistics 49 Computed flow statistics 50 23

24 No low-flow statistics? Only rural and urban/small rural flood frequency estimates available in current application Next area of focus needs to be implementation of low-flow statistics and (eventually) updated low-flow techniques(?) USGS Office of Surface Water requires that all streamflow statistics and regression techniques be cited to a publication before inclusion in a StreamStats application. Current low-flow techniques for NC (Giese and Mason, 1993) are based on data through 1987 water year (25 years ago ) Low-flow statistics have decreased for many gaging stations as a result of recent drought conditions (particularly, 2002 and 2007) 51 Questions concerns complaints? Contact info: J. Curtis Weaver, Hydrologist, PE Phone: (919) jcweaver@usgs.gov USGS South Atlantic Water Science Center