On the hydrograph, rainfall ends at hour 2. What is the lag time for this storm?

On the hydrograph, rainfall ends at hour 1. What is the storm's lag time?

Use the hydrograph for a storm on the Cedar River. Reading the y-axis, what is the peak discharge?

Rain begins at hour 0 and ends at hour 4. Using the hydrograph, what is the lag time, measured from when the rain ends?

A short, intense storm over a small urban basin ends at hour 1. Using the hydrograph, what is the lag time?

Use the hydrograph for a large, slow-responding river. Reading the y-axis, what is the peak discharge?

Two basins of equal area receive the same rainfall. Basin A is 65 percent paved; Basin B is forested. Reading the graphs, which statement is accurate?

Basin U has been channelized and paved; Basin W nearby retains extensive wetlands. Both receive the same rainfall. Which best describes Basin W's response?

A wildfire has stripped vegetation from Basin F. Basin V nearby is fully vegetated. Both receive the same storm. Which describes basin F?

Basins S and G have identical land cover and receive equal rainfall, but basin S is much steeper. Which correctly compares their storm response?

Basin Small and basin Large share the same land cover and receive the same storm, but basin Large drains a much bigger area. Which correctly compares their hydrographs?

The map shows Deer Creek and four lettered points. Which point lies in a different watershed from Deer Creek?

The map shows Willow Creek and four lettered points. Which point lies in a different watershed from Willow Creek?

The map shows Sable Creek and four lettered points. Which point lies in a different watershed from Sable Creek?

The map shows Bear Creek and four lettered points. Which point lies in the same watershed as Bear Creek?

A river gauge shows that a discharge of 650 cubic meters per second has a recurrence interval of 25 years. What is the chance it is equaled or exceeded in any single year?

A stream gauge record shows that a flow of 400 cubic meters per second has a recurrence interval of 10 years. What is the chance it is equaled or exceeded in any single year?

Use the table of gauge data. What is the annual chance that a discharge of 480 cubic meters per second is equaled or exceeded?

Use the table of gauge data. What is the chance that a discharge of 1200 cubic meters per second is equaled or exceeded in a single year?

A farm field is paved over for a shopping center parking lot. During the next heavy downpour, why does the nearby stream rise higher and faster than it did before?

Engineers straighten and deepen a meandering stretch of river to speed navigation. Why does a downstream town flood more severely than before the channel was straightened?

Loggers clear-cut a steep hillside above a valley. During the next heavy rain, why is the valley more prone to flash flooding than before?

A large storm drops heavy rain across an entire dendritic drainage network at once. Why does the main stem river crest at an unusually high level?

A city wants to lower the flood crest downtown without demolishing riverside buildings. Which measure most directly lowers the peak discharge reaching downtown?

A county wants to reduce flash flooding from new subdivisions without limiting further building. Which measure directly reduces the runoff volume reaching the stream?