# GIS in Water ResourcesReview for Midterm ExamFall 2005

The material is classified according to Bloom’s Taxonomy of Educational Objectives:

## Level         Title                      Meaning

1                Knowledge             Definitions, facts, formulas

2                Comprehension      Explanation of definitions, formulas, problem solving procedures

3                Application             Know how to use a formula or procedure to solve simple problems

4                Analysis                  Break down a complex problem and solve by steps

5                Synthesis                Derivation of basic formulas, design of new systems

6                Evaluation               Advantages and limitations of alternative approaches

## Session           Topic                                                                                                   Level

1                      Introduction to GIS in Water Resources                                                      2

2                      Introduction to ArcGIS                                                                               2

3                      Exercise 1: Mapping hurricane Katrina                                                        5

4                      Geodesy, Map Projections and Coordinate Systems                                   3

5                      Exercise 2: Building a Watershed Base Map                                                5

6                      Spatial analysis using grids                                                                           4

7                      Exercise 3:  Spatial analysis                                                                         5

8                      Data sources for GIS in water resources                                                     2

9                      Hydronetworks in GIS                                                                                4

10                    Exercise 4: Building an Arc Hydro with time series geodatabase                   5

11                    Watershed and stream network delineation                                                  4

12                    Exercise 5: Watershed and stream network delineation                                4

13                    Advanced terrain analysis concepts                                                             3

Expected Skills

## ·        Convert degree, minute, second coordinates to decimal degrees, and vice versa

• Determine the length of a line along a meridian or parallel on a spherical earth and calculate the area of a box defined by meridians and parallels.
• Determine the size of a DEM cell when projected from lat-long coordinates to Easting and Northing coordinates.
• Determine the statistics (e.g. average value or sum) of an attribute of a selected set of features satisfying a logical query
• Be able to take the parameters of a map projection and interpret what they mean (focus on geographic, UTM, Albers and State Plane projections)
• Know the common national data sources for GIS in Water Resources and their GIS data formats (vector, raster, point, line, polygon etc.)
• Be able to perform raster calculations for spatial analysis and understand the concepts involved with raster calculation
• Be able to calculate slope on a DEM
• Take a small grid of elevation cells and calculate the flow direction and flow accumulation grids
• Define the watershed of a cell in a DEM grid
• Derive Geomorphologic and Watershed attributes from a DEM derived drainage network.  These include, channel length, slope, stream order, drainage area, drainage density.
• Understand the concept of a geometric network and how traces on the network identify upstream and downstream edges and junctions.
• Understand the feature classes and tables that participate in the Arc Hydro Framework with Time Series schema and how they are interrelated.

Readings from Arc Hydro: GIS in Water Resources

 Concept Reference in “Arc Hydro” 1.   Arc Hydro is designed within the ArcGIS geodatabase using ArcObjects as its basic features Chapter 2, pp. 20-24 2.  All HydroFeatures have a unique HydroID and HydroCode Chapter 2, pp. 25-26 3.  Arc Hydro framework data model links core water features using geometric and relational connections Chapter 2, pp.  27-29 4.  More extensive development can be added Chapter 2, pp. 30- 31 5.  HydroNetwork is a geometric network of HydroEdges and HydroJunctions Chapter 3, pp. 35-39 6.  Watersheds, Waterbodies and MonitoringPoints are connected to HydroJunctions using HydroID relationships Chapter 3, pp. 39-41 7.  Upstream and downstream tracing can be done using the HydroNetwork or using NextDownID connectivity Chapter 3, pp. 41-43 8.   River addressing can be performed using linear referencing to create events on the HydroNetwork Chapter 3, pp. 44-47 9.   Terrain analysis can be used to trace the path of water movement over the landscape Chapter 4, pp. 56-59 10.  Catchments and watersheds can be derived from the DEM in a formalized way Chapter 4, pp. 60-62 11.  Watershed and terrain information is available at a variety of spatial scales Chapter 4, pp. 63-67 12.  Catchments and stream networks are derived from the DEM using the 8-direction pour point model Chapter 4, pp. 68-75 13.  Watersheds can be delineated from a set of points on the stream network Chapter 4, pp. 76-81 14.  Watersheds can be used for hydrologic analysis Chapter 4, pp. 82-84 15.  Hydrography is the “blue lines” on maps and is represented in the National Hydrography Dataset Chapter 6, pp. 118-122 16.  Water resources observational data can be stored as time series in Arc Hydro Chapter 7, pp. 142-146 17.  An Arc Hydro time series has a data value indexed by its spatial feature, type of data, and time of measurement Chapter 7, pp. 147-154 18.  The Arc Hydro framework schema can be extended to relate MonitoringPoints to TimeSeries Chapter 7, pp. 154-160