That depends on the bear in question.
By experiment. One way is to place one object on a second object and lift second object at the edge until the first object starts to move. Measure angle of tip. Tangent of angle is the coefficient of...
About 1.0 to 1.4
the coefficient is found by using the equation:discharge= cross section area (hydraulic radius x gradient) /Manning'scoefficient
It is 95.6