INDEX
Assignment 6
1. For this assignment, I clipped soil data from STATSGO to fit the
boundaries of the Pecos Headwaters watershed.
2. I added, then joined and related three tables to the soil map that
provided additional detail on the soils' properties.
3. I used these tables to answer the following questions on NM963, one
of the soil types in the watershed:
How
many components does it have?
5 distinct components
What are their names?
Regnier, Latom, Rock Outcrop, Los Tanos, Gallen
What percentage of the map unit does
each component comprise?
Regnier: 27+7+2 = 36%
Latom: 27+5 = 32%
Rock Outcrop: 18%
Los Tanos: 12%
Gallen: 2%
What is the predominant surface slope
where this soil unit is found?
Regnier: between 3 to 15%
Latom: 1 to 15%
Rock Outcrop: 0 to 99%
Los Tanos: 0 to 5%
Gallen: 5 to 35%
[I selected the slope ranges for the soil components that comprised the
highest percentage of the map unit.]
What is the dominant soil texture?
Regnier: clay loam and gravel-sandy clay loam
Latom: fine sandy loam and gravel-fine sandy loam
Rock Outcrop: underweathered bedrock
Los Tanos: fine sandy loam
Gallen: gravel-sandy loam
What percentage of the soil is in
hydrologic soil groups A, B, C, D?
A: 0%
B: 2%
C: 12%
D: 86%
Do these soil properties make sense
considering where the soil is
located?
Yes, given that NM963 soil is located along a section of the Pecos
river bed.
How many layers does each component
have?
Component 1 (Regnier): 3
Component 2 (Latom): 2
Component 3 (Rock Outcrop): 1
Component 4 (Los Tanos): 3
Component 5 (Regnier): 3
Component 6 (Latom): 2
Component 7 (Regnier): 3
Component 8 (Gallen): 4
What is the total soil depth (inches)
for each layer and the average
depth (inches) for the map unit?
Component 1 -
Layer 1: 9
Layer 2: 9
Layer 3: 4
Component 2 -
Layer 1: 8
Layer 2: 12
Component 3 -
Layer 1: 60
Component 4 -
Layer 1: 6
Layer 2: 18
Layer 3: 4
Component 5 -
Layer 1: 9
Layer 2: 9
Layer 3: 4
Component 6 -
Layer 1: 8
Layer 2: 12
Component 7 -
Layer 1: 9
Layer 2: 9
Layer 3: 4
Component 8 -
Layer 1: 4
Layer 2: 11
Layer 3: 10
Layer 4: 35
Comp. 1: 27/100 * 22 = 5.94
Comp. 2: 27/100 * 20 = 5.4
Comp. 3: 18/100 * 60 = 10.8
Comp. 4: 12/100 * 28 = 3.36
Comp. 5: 7/100 * 22 = 1.54
Comp. 6: 5/100 * 20 = 1
Comp. 7: 2/100 * 22 = .44
Comp. 8: 2/100 * 60 = 1.2
Average soil depth is 3.71 inches.
What is the total water holding
capacity (inches of water) over the
full soil depth for each component?
Component 1: 3.06
Component 2: 1
Component 3: 0
Component 4: 3.3
Component 5: 3.06
Component 6: 1
Component 7: 2.43
Component 8: 3.52
What is the average water holding
capacity (inches of water) for soils
in this map unit?
0.23
4. I downloaded land use data from RGIS for the Pecos Headwaters
and added it to the map. Although the assignment recommended use of
shape files, I received the error message that the files could be
"drawn but not projected" when I tried to add them to my map. So I
imported interchange files instead,
and created the map below.
5. I appended the two land use files, and the changes I had made to the symbology were erased. I tried to intersect the soil and land use data,
but was not able to do so because the land use data was a coverage instead of a shape file. I exported the coverages to shape files, and tried to intersect them again, but this time the operation terminated because of a datum conflict.