Geology Reference
In-Depth Information
Exercise 17 • Geology and Regional Planning
263
b.
On Figure 17.3, select and mark (with "S&G") three
sites where sand and gravel that could be used as aggre-
gate might occur.
RESOURCE-CAPABILITY MAPS
AND BASIC-DATA MAPS
7. By now you probably have determined that consulting
basic data tables and maps and evaluating these data for a
specific resource use can be confusing and time consuming.
Resource capability maps are often used to ease the problem
of determining the best use of the land from data in tables.
Figure 17.4 is a resource capability map showing capability
for septic-tank tile fields. It has been drawn using the follow-
ing basic data or basic data maps:
2. a.
From what formation could you obtain ceramic
grade materials?
soil permeability: low permeability is a severe limitation
depth to bedrock: less than 10 ft is a severe limitation
slope: over 10 percent is a severe limitation
flood hazard: soils with any degree of overflow present a
severe limitation
b.
On Figure 17.3, select and mark ("CM") a potential site
for extraction of high-quality (ceramic-grade) clays.
Using the information in Figure 17.4, determine the
potential for using septic tank systems with drain fields in
the following areas (Figure 17.3) that are being considered
for subdivision development.
3. a.
What geologic formation would provide "dimension"
building stone for Waco?
b.
Why can you not mark such a site on the geologic map
(Figure 17.3)?
a.
X, 1.7 miles NE of the dam of Lake Waco, on Qbrl:
b. Y, immediately SW of Heart O'Texas Fairground, on Kau:
4. From the information given in Table 17.3, determine the
geologic units that might be investigated as potentially
acceptable sites for a sanitary landfill in the West Waco area.
Justify your choices by completing the table below.
c.
C, east of the Brazos River, on Qbr2:
5.
In which geologic units (Table 17.3) in Waco would the great-
est potential exist for contamination of potable groundwater
by leachate from sanitary landfills or abandoned clumps?
8. Using the resource capability maps (Figures 17.4,17.5, and
17.6), basic data map (Figure 17.7), and basic data for the geo-
logic units in Table 17.3, evaluate
one
of the following areas in
Figure 17.3 for possible residential development: A, D, or Z
(Kta). Describe the problems and advantages for low-density
housing in the area you select. Begin by reviewing the charac-
teristics of each site. Then select one for your evaluation. Note:
"A"
is on the west side of the curve in the road on Kpe; "Z" is
on Taylor Marl, Kte.
6. a.
Refer to your answer to question 4 and select a possible
site for a sanitary landfill. Outline this area on the Waco West
Quadrangle (Figure 17.3). Place the symbol "SL" in the center
of the area. (Or describe the location and geologic material at
the site).
b. State the most important factor that resulted in your
decision and a possible minor problem for the site.
Rock and Mineral
Resources
Groundwater
Potential
Geologic Unit
Material
Infiltration
