LaGro Flashcards
Four Factors dictating scope of site inventory and analysis
Proposed site uses (for example, project program)
Existing on-site and off-site conditions
Requirements for permitting and approvals
Costs of data collection and analysis
U.S. Geological Survey
Topographic maps at several scales
Provide information on the biophysical and cultural context of a community or region
Site topographic surveys
Larger in scale
Usually completed by a licensed land surveyor in accordance with specifications tailored to the program and the site.
Three key attribute maps drives from topographic survey
Elevation
Slope
Aspect
Aspect
A slope’s orientation
The direct that the slope faces
Identified by compass direction
Aspect eight classifications
North, northeast, east, southeast, south, southwest, west, northwest
How does aspect influence microclimate?
By affecting the level of solar radiation that strikes the site
Distinct signatures of prior glaciation
Eskers
Kames
Moraines
Landforms influence
Microclimate
Stormwater runoff and infiltration
Distribution of plant and animal species
Surficial geography
Structure, composition, and stability of the materials beneath and at the earth’s surface
Important attribute is depth-to-bedrock
Natural processes that involve rock fragmentation and weathering
Soil formation
Soil erosion
Soil deposition
Why does weathering occur unevenly?
Because of variations in the bedrock’s chemical composition and structure
Urban development Can have significant impacts on local and regional hydrology
Increased volumes and rates of runoff discharges
Reduced time needed for runoff to reach surface waters
Increased frequency and severity of flooding
Reduced streamflow during prolonged periods of dry weather
