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<br />~. SS ~ it <br />• III IIIIIIIIIIIIIIII • ~,~`~ 3~~ <br />T~ 3~ <br />SIMONS~ LI & ASSOCIATES INC. <br />3555 STANFORD ROAD TELEPHONE (303) 223-4100 <br />P.O. BOX 1816 TELEX: 706057 <br />FORT COLLINS. COLORADO 80522 <br />April 7, 1986 <br />RECE11%E® <br />Mr. Ernie Crowe <br />Associated Geotechnical Systems, Inc. JUN 2 3 1987 <br />50 Steeles Avenue East <br />Milton, Ontario CANADA L9T4W9 MINED LAND <br />RECLAMATION DIVISION <br />Re: Geoweb Grid Confinement System <br />SLA Project Number CO-FC-86.5 <br />Dear Mr. Crowe: <br />In a recent letter to Simons, Li 8 Associates, Inc. (SLA), you <br />requested information pertaining to methods of establishing limiting <br />velocity, Manning's n values used for design, and the effect of <br />flow depth on channel stability. I have enclosed a description of the <br />method for establishiny limiting velocities given the stone sizes pre- <br />sented in your letter. Due to the uncertainty in the application of <br />erosion mechanics, I hesitate to provide you with design values for <br />Manning's n and a discussion of the flow depth on channel stability. <br />To properly design a stable channel many factors must be evaluated. <br />Experience in erosion mechanics and engineering judyement play an <br />important role in stable channel design. I would recommend that you <br />contact us or an equally qualified firm if the design of a specific <br />channel is in question. <br />I am also enclosing an invoice for the cost of preparing and sending <br />the enclosed information. If I can be of further assistance, do not <br />hesitate to contact me. <br />Sincerely, <br />Bradlek~derson, P.E. <br />Senior Water Resources Engineer <br />BAA/mpp <br />RDF214/R833 <br />Colorado Springs, CO ~ Denver, CO <br />Newport Beach, CA ~ Phoenix, AZ ~ Tucson, AZ <br /> <br />