You Can use Chapter 14 from our new Hydraulic Manual on the website to figure out detention. <br /> Bo Miller, P.E. <br /> Region 2 Hydraulics Engineer <br /> Oregon Department of Transportation <br /> ' ling A <br /> Airport Road, S.E., Salem, Oregon, 97301 <br /> Phone: (503) 986-2738 <br /> FAX: (503) 986-5817 <br /> Internet: bo.miller@odot.state.or.us <br /> <br /> ~r <br /> 5/17/2006 <br /> <br />