I took advantage of whatever natural declivities there were, so that my channel curved but was reasonably deep.

He put his hand, palm down, on a rough, apparently natural declivity in the wall, and suddenly a whole section of the wall pivoted inward.

In the case of batteries of towed artillery the temporary magazine will be placed, if possible, in a pit, or natural declivity, or surrounded by sandbags or earthworks.

The structure is elliptical in form and it was built into a natural declivity in the terrain.

The camp was in a natural declivity, and the dozen small fires would not be visible from any distance.

The pit was a broad one, a natural declivity bored out of the clay creekbank by some distant flood and then deepened by judicious spadework in the years succeeding.