drainage depression definition
drainage depression means a level to gently inclined shallow, open depression with a smoothly concave cross-section, rising to moderately inclined hill slopes;
drainage depression means a level to gently inclined shallow, open depression with a smoothly concave cross-section, rising to moderately inclined hillslopes;
drainage depression means a level to gently inclined shallow, open depression, generally with a smoothly concave cross-section, rising to moderately inclined hill slopes, that conveys runoff water only during or immediately after (that is, only hours or days after) periods of heavy rainfall.