A planner maps all land whose rainfall eventually reaches a town's river intake. What hydrologic unit is the planner mapping?

Surveyors must mark the boundary between two neighboring stream basins on a contour map. What feature should they follow?

A proposed shopping center is uphill from a drinking-water intake on River A. To determine whether its surface runoff can reach that intake, what area should be delineated?

Rain falling on opposite sides of a hilltop flows toward two different creeks. What is the hilltop acting as?

A monitoring station is moved from just above a tributary confluence to just below it. How does the station's watershed usually change?

A watershed map shows several small creek catchments inside the basin draining to one large river mouth. What relationship does this show?

A county draws its water-management boundary exactly along county lines, but a ridge dividing runoff lies elsewhere. What boundary better represents the watershed?

A landowner builds a berm across a low gap in a ridge and directs runoff toward another creek. What can change as a result?

After a forested part of a catchment is replaced by a large paved parking area, what is the most likely change during the next heavy rain?

A warehouse roof drains through gutters into a storm drain. In most US cities, where does water entering a storm drain usually go?

An upstream farmer replaces a vegetated field edge with bare compacted ground. During storms, why can downstream streamflow rise more rapidly?

A city removes a wetland beside a river to build stores and parking lots. During similar storms, what change is most likely downstream?

Water diverted from an upstream river into an irrigation canal is applied to fields, and the excess drains through ditches into a downstream creek. What connects the diversion to downstream users?

A subdivision replaces grass with roofs, roads, and driveways. During long dry spells between storms, what change in the nearby stream's flow is most likely?

Use the graph of peak streamflow after equal rainstorms. What conclusion is supported?

A town upstream begins withdrawing more water from a shared river during a dry summer. What is the direct concern for downstream users?

A river district has 90 million L available during drought. It reserves 30 million L for the city and 20 million L for required streamflow. How much remains for irrigation?

Under the 1922 Colorado River Compact, what amount was apportioned annually to each of the Upper and Lower Basins?

Two irrigation districts share 40 million L of river water. The upstream district diverts 10 million L before the downstream intake, with no additional inflow. How much can reach the downstream intake?

In a western water-right system, a farmer with an earlier beneficial-use claim receives water before a later claimant when supplies are short. What doctrine is being applied?

A watershed council pays landowners to keep vegetated strips along stream banks. What is the primary surface-water management purpose?

A city restores a floodplain wetland beside a river. During high flows, what service can the restored wetland provide?

A city replaces an asphalt parking lot with permeable pavement. What change in stormwater is it intended to produce?

A reservoir operator stores part of spring runoff and releases water later in a dry season. What water-management result does this most directly provide?

A school installs rain barrels that capture roof runoff for watering gardens. What two demands can this practice reduce?