CEMP-ET
TI 804-01
1 July 1998
2/ Topography. Existing elevations, high points, low points, and slopes
should be defined. Slopes are usually described by their percent grade and placed in
appropriate ranges (e.g., 0-5%, 5-10%, 10-20%, etc.).
3/ Hydrology. A hydrologic assessment provides information on surface and
subsurface water movement. This information can be used to prevent flooding, erosion, and
pollution of surface and groundwater and to promote groundwater recharge, habitat
development, and recreational use.
a/ Subsurface. Subsurface hydrology concerns the storage and movement
of water beneath the soil surface. Groundwater moves through the soil and through aquifers.
Because aquifers are potential sources of potable water, federal, state and local agencies may
regulate the quantity and quality of water allowed to infiltrate the ground surface. If a site is in
a groundwater recharge area, there may be restrictions upon the amount of impermeable
surface to be implemented and upon the water quality allowed for infiltration.
b/ Surface. Existing surface water bodies such as rivers, lakes, ponds,
streams and springs should be recorded. Drainage patterns, flood plains, impermeable
surfaces (pavements and rooftops) and other conditions affecting the movement of surface
water should also be recorded. Significant information should be depicted graphically.
4/ Soils. Soils types and locations should be recorded and depicted
graphically. The development potential of each type should be defined.
5/ Climate. A complete climatic evaluation of the site should be defined.
Climatic conditions affect such planning concerns as building location and orientation,
pedestrian circulation, and vegetation. The following information should be obtained and
evaluated:
a/ Average monthly temperature range.
b/ Quantity, frequency, and type of precipitation.
c/ Midwinter and midsummer sunrise and sunset orientation and angle.
d/ Prevailing wind direction throughout the year.
6/ Vegetation. The location of all existing trees should be shown
graphically. The trees should be located by survey and identified by common and botanical
name, size and condition. Identification of local plant associations provide information on the
types of tree and understory plant material which thrive in the area and should be used for
landscape design applications when the area is developed.
7/ Wildlife Habitat. Natural wildlife habitats within the development area
should be identified. Threatened and endangered species habitat requires protection.
8/ Archeological, Cultural and Historic Resources. Structures or sites that
have been defined as historically, culturally or archeologically significant should be identified.
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