The phrase "a depth equal to or" is correct and usable in written English.
It can be used in contexts where you are comparing or specifying measurements, particularly in technical or scientific writing.
Example: "The excavation must reach a depth equal to or greater than five meters to ensure stability."
Alternatives: "a depth of at least" or "a depth that is no less than".
Slots, bore holes, etc. can only be coated down to a depth equal to the width or diameter of the opening.
It occurs approximately at a depth equal to one-third the wavelength or 10 times the wave height.
Digging stops when the female has reached a depth equal to the length of her outstretched hind limbs.
A statement from Deep Ocean Search, the vessel's owners, said the search team eventually narrowed down the search to "a depth equal to 10 times the height of London Shard tower", a 310m-high skyscraper.
In the early 19th century a hydraulic lift was introduced, in which the platform was attached to a plunger in a cylinder sunk in the ground below the shaft to a depth equal to the shaft's height.
Within this model the crack is modeled as an "elastically equivalent notch" with a depth equal to the effective crack length ae.
Bellman-Ford, which I've never heard of before and is useful in the strange case I've never encountered where you might have edges with negative weight, is basically that you do a depth-first search to a depth equal to the number of nodes, and then if it's still possible to improve the distance to a node by going over an edge from another node then there must be a negative weight cycle.
Fatigue life is represented as the sum of the number of stress cycles to the initiation of a microstructurally short crack with a depth equal to one grain size and the number of stress cycles to the instant the growing physically small and long crack reaches the depth taken as a fatigue failure criterion.
ρ eff exhibits a minimum at the interface between two lamellae (for a depth equal to 0 in the simulation), whatever the angle between the two adjacent lamellae.
If drilling, the object will be to drill to a depth equal to the part of a key that would normally be inserted into a working lock.
