Which of the following is true concerning the pannes in salt marshes? a.
They are isolated pools of water at low elevations.
b.
They are isolated pools of water at high elevations.
c.
They are interconnected pools of water at low elevations.
d.
They are interconnected pools of water at high elevations.

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.