Question 1

The length of the stream is referred to as its:

Accepted Answer

D

Question 2

An area where all of the water drains to a common location describes:

Accepted Answer

A watershed is an area of land where all of the water that is under it or drains off of it goes into the same place. This includes rivers, lakes, underground aquifers, and other bodies of water.

Question 3

In an ArcGIS Flow Direction calculation, a grid cell value of "4" indicates water flow in which direction?

Accepted Answer

Water flows in the direction of the steepest descent, and in ArcGIS Flow Direction, the value "4" represents the direction of steepest descent, which is south.

Question 4

A filled sink results in a:

Accepted Answer

The answer of A filled sink results in a:
...

Question 5

How does the Strahler method rank stream ordering?

Accepted Answer

The Strahler method of stream ordering increases the stream order only when two streams of the same order merge. If a stream of a lower order joins a higher order stream, the order remains the same as the higher order stream.

Question 6

Which of the following Flow Direction methods is used in ArcGIS?

Accepted Answer

The D8 method is a commonly used flow direction algorithm in ArcGIS, which assigns flow direction to one of the eight neighboring cells based on the steepest descent.

Question 7

In hydrologic modeling, the number of cells that connect to constitute a stream channel refers to the:

Accepted Answer

The term "threshold" in hydrologic modeling refers to the minimum number of cells that must be connected for the area to be considered a stream channel. This concept is crucial in defining the stream network within a catchment area during the modeling process.

Question 8

Stream channels can be directly extracted by querying which grid?

Accepted Answer

Stream channels are often delineated from a flow accumulation grid, which shows the number of upstream cells contributing flow to each cell. Areas with high flow accumulation values indicate potential locations of streams or rivers.

Question 9

What assumptions are made in the ArcGIS hydrologic modeling process?

Accepted Answer

ArcGIS hydrologic modeling often assumes uniform rainfall and soil characteristics across the surface to simplify calculations and model the flow of water.

Question 10

The boundary of a watershed is the:

Accepted Answer

The boundary of a watershed is defined as the drainage divide, which is the geographical boundary that separates one watershed from another by directing the flow of water to different basins.

Question 11

In an ArcGIS Flow Direction calculation, water is calculated to flow in:

Accepted Answer

Flow direction in ArcGIS is determined by the direction of the steepest slope, which is calculated from the elevation values of the surrounding cells in a raster grid.

Question 12

The ArcGIS tool that will determine how many cells flow into a location is:

Accepted Answer

The answer of The ArcGIS tool that will determine how...

Question 13

In an ArcGIS Flow Direction calculation, a grid cell value of "32" indicates water flow in which direction?

Accepted Answer

The answer of In an ArcGIS Flow Direction calculation, a...

Question 14

The stream-ordering method that allows for the stream ranking order to be computed by adding the ranks of the two streams flowing into each other is:

Accepted Answer

The Shreve stream-ordering method involves adding the orders of streams when they merge. This system is used in hydrology to classify the hierarchy of streams based on their network structure.

Question 15

A feature class that represents the outlet location for the drainage of water is a:

Accepted Answer

Pour points are specific points that represent the outlet locations where water drains out of an area, commonly used in hydrological and watershed analysis.

Question 16

What is a sink (in terms of hydrologic modeling)?

Accepted Answer

A sink in hydrologic modeling refers to a low point on the terrain surface that is surrounded by higher points, which can trap water and prevent it from flowing out.

Question 17

The determination of how many cells flow into a location best describes:

Accepted Answer

Flow accumulation refers to the process of determining how many cells contribute flow into a particular location in a grid-based model, often used in hydrology and geographic information systems (GIS).

Question 18

Data layers that are generated by ModelBuilder and then deleted as the model is run are referred to as:

Accepted Answer

Intermediate data are the data layers or datasets created as part of the processing steps within a ModelBuilder workflow in GIS software, which are not needed after the model completes its execution and can be deleted.

Quiz 22: How to Use Hydrologic Modeling Tools in Arcgis Pro