Rick Faber CE 513 Building a Base Map Lab #2 6/2/06

Rick Faber CE 513 Building a Base Map Lab #2 6/2/06

1. Objective & Discussion: By using data for the Guadalupe river basin in Texas, we will get a chance to build a base map of hydrologic features. These features will include the HUC regions, streams, river monitoring points, aquifer and satellite imagery. These data are to be imported into a personal geodatabase. Some of the tools include: performing relational joins, correcting for the proper projections of the various data, importing XY data (monitoring stations) and projecting them, looking at data layers available via the internet and sampling some real time stream flow data. 2. Major Steps Utilized in this Lab - Convert Interchange file to Coverage file Toolbox, coverage tools, import from interchange file - Importing data into the geodatabase ArcCatalog, New/Personal Database/ select, New/ Feature Dataset Set coordinate system. Import/FeatureClass - Projecting the Geodatabase When setting coordinate system, Select/ Coordinate system - Selecting the Guadalupe Basin Watersheds Layer Joins&Relates/Join to add names to attribute table, the select by name or button - Getting the Guadalupe River Reaches Relational Join for names, Select by attribute (name) - Creating a Point Feature Class of XY data Tools/ Add XY Data (latdd and longdd) in file will work swell - Add Attributes to the Point Feature ArcCatalog: open database, Properties/Fields/ add entries for new fields - Overlaying the Edwards Aquifer ArcMap import shp file: Toolbox/ ConversionTools/ ToGeodatabase/ Feature to Feature - Adding Data from the Internet ArcMap: File/ Add Data from Internet/ Geography Network select data - Downloading USGS Flow Data : http:// water.usgs.gov/realtime.html 3. Flow Chart of Major Steps (Tracy said not applicable for this lab.) 4. Lab Questions: 1. A professional map and all required map elements of the Guadalupe Basin streams and watersheds. 6 pts See following page

2. What is the approximate map extent of these data in geographic coordinates? Use the Draw Tools in ArcMap to draw a line on the map showing the Central Meridian of the projection at 96ºW and another line showing the Standard Parallel at 29º 30 N. Screen capture the resulting map display and include it in your solution. 2pts -93.11 W to -103.92 W, 25.81 N to 34.73 N Map Extent with the Central Meridian and Standard Parallel This screen shot shows the extent of data of Water Resources Region 12 (HUC8). The central meridian (96ºW) and standard parallels (29º 30 N) for this region have been plotted as well.

3. A layout or screen capture of the MonitoringPoint attribute table with the map. 2 pts Monitoring Point attribute table and Map This screen capture shows the 7 river gauges plotted on the Guadalupe river basin. The partial attribute table shows the name and annual flow of these stations. Note the increasing flow as the river flows southeast. 4. A professional map and all required map elements showing the base map, chart and data table for the Guadalupe River flows. 6 pts (see following page) 5. Between which two gaging stations does the Edwards aquifer outcrop area occur? What is the difference in mean annual flow at these two gages? Comment on these data. Do they seem correct to you?3 pts The Edwards aquifer crosses the Guadalupe watershed between the Sattler (464cfs) and New Braunfels (552cfs) stations. As there are no additional tributaries between these stations, I would guess the additional flow is coming from the large portion of Edwards aquifer which is flowing NE towards the Guadalupe. In fact, I believe that s the reason the New Braunfels monitoring station was placed where it is.

6. A quick ma p (does not require all map elements) showing map images added to your basemap information from the Geography Network. 3 pts

7. The graph of flow of the Guadalupe River at Cuero printed from the NWIS website. What are the 20%, 50%, and 80% exceedence flows for the calendar day on which you do the download? Approximately what % exceedence is the flow currently? 5 pt Daily mean flow statistics for 4/19 based on 40 years of record in ft 3 /sec Current Flow Minimum Mean Maximum 80 percent exceedance 50 percent exceedance 20 percent exceedance 610 340 2,974 25,300 662 1,365 2,534 Percent exceedance means that 80, 50, or 20 percent of all daily mean flows for 4/19 have been greater than the value shown. The 80,50 and 20% exceedance flows for 4/19 are 662,1365,2534 cfs respectively. The current flow of 610 is a bit less than the 80% exceedance flow, the %exceedence would be a touch higher than 80%. I gather they are having a drought in this part of the country.