WEC Mapping Committee/Environment Map - Earth science

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Toward a map of "geology, soils (including impermeable soils), hazard areas, topography".

Contents

[edit] Map Styles Summary

  • area fill - soil permeability
  • hatching - hazard areas
  • linework - contours
  • linework arrows - drainage areas

[edit] Hydrology - further research required

How far did ODOT get in developing this info for West Eugene?

a) Surface Hydrology

Can be shown as fields of arrows over area graphics, with arrow density and attributes indicating direction and flow rates. (If we can't get real surface hydrology, perhaps we could use open waterways (all classes) and synthetic slope lines as a crude surrogate for collective visualization.)

Is stormwater data [1] of any use? Does that data even exist outside of the development footprint areas?

A note received from Gary who has been looking into the RLID stormwater layers: "...There are three choices: Drainage Basin, Basin Study and Open & Piped layers. I not sure that the open & piped might not be the best because it shows use where we are and will indicate the direction that the water is being directed. The 2’ contours that we have already agreed on will indicate the direction of surface water." Kevin 14:49, 23 October 2007 (PDT)

b) Sub-surface Hydrology

Could be shown as contrasting arrows - maybe a few big bold ones since we only have general data.

[edit] Geology - obsolete category

Likely shown as area fill.

This is an RLID layer of geology, "clipped from lane_geol which was in turn clipped from ore_geol, a statewide coverage. It is necessarily generalized, being clipped from such a source": [2]

We may forego showing subsurface geology on this map because of:

  1. Lack of fine resolution information, at a lot-to-lot scale, and
  2. Lack of specific implications for land use, transportation, and environmental decisions.

[edit] Soil Permeability

Likely shown as area fill.

[edit] Hazard Areas

Potentially shown with highlight graphics over area fills, over or under contour linework.

  • "Depicts relative risk of earthquake damage that results from local geological conditions. This is a combination of two likely earthquake sources: amplification and slope instability.": [3]
  • "100yr and 500yr Flood Hazard Area - These area match the FEMA 1999 maps. This coverage only covers the City of Eugene area" [4]
  • "This coverage was created by digitizing a set of paper maps called FLOODWAY, Flood Boundary and Floodway Map, published by the National Flood Insurance program. The index map lists a revision date of May 2, 1994. It covers central Lane County. These maps were issued by the Federal Emergency Management Agency (FEMA). Map scale is 1:12,000. You can take a look at this file and several related files using ARCVIEW. Check out g:\arcview\projects\floodbuf.apr ---pe": [5]
  • "This data represents an index grid map of the federal Flood Insurance Rate Maps (FIRM)." [6]

[edit] Topography

This is an example map of topography and flood areas: media:Map2-4 regional topo flood.pdf

Likely shown as linework over area fill.

  • This is an RLID layer of Eugene in 2' contours: [7]
  • This is an RLID layer of Metro area 20' contours: [8]

[edit] External Links

IMS-24 New State of Oregon DOGAMI multi-hazard analysis and maps - 2008.0714

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