FE 423 - Watershed Analysis Lecture 1a - Overview

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FE 423 - Watershed AnalysisLecture 1a - Overview

• Finn Krogstad
• UW Forest Engineering
• http//students.washington.edu

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OVERVIEW

• why -
• what -
• when -
• where -
• how -
• who -

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EARLY MANAGEMENT

• Management was done with little consideration of
  environmental impacts

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Early Regulations

• Case-by-case evaluation of roads, harvests, and
  locations
• Still dominates forest management today

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Watershed Analysis

• APPROACH - basin specific
• where are the hazards
• what are they sensitive to
• will they reach the stream
• are there sensitive reaches
• are vulnerable fish there
• do inputs exceed background

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Watershed Analysis

• PROBLEMS
• Massive expert time
• Site-by-site investigation
• Stop being watershed specific
• Site, not landscape plans
• Is plan A worse than plan B?

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Goal Comparing Landscape Options
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OVERVIEW

• why - spatial approach
• what -
• when -
• where -
• how -
• who -

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WATERSHEDS

• Spatial Heterogeneity
• Water Flows Downhill

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EACH POINT HAS UNIQUE

• Vegetation
• Soil
• Slope
• Aspect
• Upslope Area
• Distance to Stream
• Management

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DOWNHILL IMPACTS

• Saturating Hillslopes
• Erosion Runoff Filtering
• Stream Flow Volumes
• Stream Width Depth
• Sediment Supply
• Fish Habitat

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WE NEED
1a. Data for each point in the watershed 1b.
Calculate processes at each point 2a. Sum outputs
from upslope area 2b. Sum delivery costs to
stream
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Spreadsheets - The Most Powerful Scientific Tool
Ever Developed
1. Bring in data 2. Run calculations 3. Display
results Originally was Programming for
Accountants
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GRID the Spreadsheet for Landscapes
1. Bring in spatial data (soils, vegetation,
topography, ) 2. Run equations 3. Display
results ArcView not just pretty pictures
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Watershed Analysis in GRID

• data for each point
• calculation at each point
• along path to the stream
• accumulating upstream inputs
• accumulating different inputs
• compare management plans

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OVERVIEW

• why - spatial approach
• what - downhill in GIS
• when -
• where -
• how -
• who -

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SCHEDULE
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OVERVIEW

• why - spatial approach
• what - downhill in GIS
• when - schedule
• where -
• how -
• who -

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SYLLABUS
OSB
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OVERVIEW

• why - spatial approach
• what - downhill in GIS
• when - schedule
• where - OSB 111
• how -
• who -

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SYLLABUS

• Instructors Finn Krogstad, Peter Schiess
• GradingFE423 three exams (33 each)FE523
  three exams and a project (25 each)
• Lectures Tuesday Thursday, 930-1120, in OSB
  111 (except first day in AND 302)
• ExamsEach exam will include an in-class and a
  take-home part. The in-class part is open book,
  open note, pencil-and-paper discussion of
  grid-based solution of watershed problems. The
  take-home part which will require solution of
  problems.
• Practice ProblemsEach lecture will include a
  set of problems to provide hands-on experience in
  the grid-based approach to solving watershed
  problems. These problems are not handed in, but
  the exams will look much like these problems, and
  will assume that students have completed all
  problems.

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READINGS

• Hard copy of the online help Cell Based Modeling
  with GRID
• People without ArcView experience Getting to
  know ArcView GIS
• Another view of Spatial Analyst Extending
  Arcview GIS
• Some Hydrology and Geomorphology Water in
  Environmental Planning, Watershed Analysis
  Manual (WFPB) Geomorphology (Chorley, et al)

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OVERVIEW

• why - spatial approach
• what - downhill in GIS
• when - schedule
• where - OSB 111
• how - syllabus
• who -

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Why Watershed Analysis in GRID?

• PROBLEMS
• not a survey class an approach, not facts
• learning GIS requires work
• existing software more accurate black boxes
• ADVANTAGES
• quantitative approach actually say something
• insight into process applicable to many issues
• GIS skills applicable to other types of problems

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Should you take this course?

• Spatial Hydrology
• Landscape Scale
• More GIS

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Discussion Problemsfor Thursday, try and be
ready to discuss the following

• Make a spreadsheet that will estimate the peak
  flow Q5.157A.9Pa1.35F-.21 for a five year
  storm in Region XII, using a table of road
  crossings with their respective contributing area
  A, percent forest cover F, and annual rainfall
  Pa.