True or False The U.S. Natural Resources Conservation Service (NRCS) developed a

Question

True or False

The U.S. Natural Resources Conservation Service (NRCS) developed a synthetic unit hydrograph based on the curve number. A design storm may be specified by its recurrence interval or its annual probability of occurrence.

A 5% storm is a storm that would be exceeded in severity once every 50 years.

Flow direction will be from an area with a low piezometric head (as determined from observation wells) to an area of high piezometric head.

A flood occurs when more water arrives than can be drained away.

An aquifer whose water surface is at atmospheric pressure is known as an unconfined aquifer.

Explanation / Answer

* An aquifer whose water surface is at atmospheric pressure is known as an unconfined aquifer. ---True

A water-table, or unconfined, aquifer is an aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.

* A flood occurs when more water arrives than can be drained away. ---True

Floods can happen on when water is supplied by rainfall or snowmelt more rapidly than it can either infiltrate or run off

*Flow direction will be from an area with a low piezometric head (as determined from observation wells) to an area of high piezometric head. ---------True

piezometric head is assumed to vary linearly betwee point of know head and all points along a line joining two points with piezometric head can be considered to have same head

*A 5% storm is a storm that would be exceeded in severity once every 50 years.-true

*NRCS developed a synthetic unit hydrograph based on the curve number--true

NRCS method of estimating rainfall excess from rainfall

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