1. The problem statement, all variables and given/known data A river of width D flows Northward with speed v. Show that the water is lower at the west bank than at the east bank by approximately 2Dwvsinlamda/g where w is the angular velocity of the earth and lamda the latitude. 2. Relevant equations 3. The attempt at a solution I get the difference in height as 2Dwvsin(lamda)cos(lamda)/sqrt(g^2 +(2wvsin(lamda)cos(lamda))^2) So if this was the same as my answer it would mean that cos(lamda)/sqrt(g^2 +(2wvsin(lamda)cos(lamda))^2) = 1/g Im just unsure how to prove this, it looks like a simple right angled triangle to show this by rearranging to show coslamda = sqrt(g^2 +(2wvsin(lamda)cos(lamda))^2)/g Does this look right guys?