CE-547 GIS in Water Resource Engineering
Assignment 6
Jake McDermott
1) Describe the NM963 soil in terms of its properties in the Mapunit and Component Tables. How many components does it have? What are their names? What percentage of the map unit does each component comprise? What is the predominant surface slope where this soil unit is found? What is the dominant soil texture? What percentage of the soil is in hydrologic soil groups A, B, C, D? Do these soil properties make sense considering where this soil is located?
NM963 has 5 components (Regnier 36%, Latom 32%, rock outcrop 18%, Los Tanos 12%, Gallen 2%).
The predominant slopes (in degrees) are: Regnier ~79 , Latom ~86, rock outcrop (not given), Los Tanos (not given), Gallen ~80.
The predominant textures: Regnier-CL, Latom-FSL, rock outcrop-UWB, Los Tanos-FSL,Gallen- GR-SL
Percentage of soil in Hydrologic soils groups A-0, B-2, C-12, D-86 If the soils groups correspond to soil horizons, then yes they do make sense, as slopes this steep generally do not support A or B horizons.
These answers were determined by both joining and relating the comp, mapunit, and layer tables to compile available data into an one or two tables that were easier to read. This was achieved by right clicking one of the tables then clicking > joins and relates then choosing the most appropriate option and following the directions in the dialogue box. Another useful way to trim down these rather large data sets into something more manageable was to double click on a table then click the fields tab. By checking or unchecking the tab it is possible to choose which fields are shown and thus eliminate quite a bit of scrolling and searching.
2)For mapunit NM963, how many layers does each component have? What is the total soil depth (inches) for each layer and the average depth (inches) for the map unit? What is the total water holding capacity (inches of water) over the full soil depth for each component? What is the average water holding capacity (inches of water)for soils in this map unit? The calculations compiled in the table below were made in excel using data exported from tables viewed in arcmap by clicking options > export at the bottom of the table.
|
NM963 |
|
|
|
|
|
component |
layers |
total
soil depth (in.) |
total holding
capacity (in.) |
average
capacity/layer |
|
1 |
3 |
22 |
3.06 |
0.4617 |
|
|
|
|
|
0.3645 |
|
|
|
|
|
0 |
|
2 |
2 |
20 |
1 |
0.27 |
|
|
|
|
|
0 |
|
3 |
1 |
60 |
0 |
0 |
|
4 |
3 |
24 |
3.3 |
0.0936 |
|
|
|
|
|
0.3024 |
|
|
|
|
|
0 |
|
5 |
3 |
18 |
3.06 |
0.1197 |
|
|
|
|
|
0.0945 |
|
|
|
|
|
0 |
|
6 |
2 |
8 |
1 |
0.05 |
|
|
|
|
|
0 |
|
7 |
3 |
18 |
2.43 |
0.0216 |
|
|
|
|
|
0.027 |
|
|
|
|
|
0 |
|
8 |
4 |
25 |
3.52 |
0.008 |
|
|
|
|
|
0.0154 |
|
|
|
|
|
0.012 |
|
|
|
|
|
0.035 |
The
land usage map above is clipped from the