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I I I I I I I I I I I I I I I I I I I page XII.6, In step (2), correct equation XII. 1 to replace "R" with "H.". note that the equation is usually expressed differently; and after "where c.. = weighted creep ratio" insert R. = Differential head across the seepage path. Note that there may be several critical seepage paths such as from the upstream water surface to the water surface over the toe drain, or from the downstream tailwater to the water surface over the toe drain. page XII-?, 2nd paragraph, fIrst line, change "lowered" to "increased" , page XII-9, Insert at top of page For many UDFeD drops in grass lined channels, this methodology is at the limit of applicability because of submergence effects and the extent of extrapolation. This is also true for other methods, several of which require more submergence before they apply. See discussion in addendum. page XII-9, step h, 5th line, insert after C.D, Smith "ref.(69)". page XII-10, Figure XII-l, add to the prof1le the vertical dimension "d2" which is the difference between the tailwater and the basin floor. Add the equation d2 = V2 + B page XII-1S, at top of page insert: "Please see addendum for recent research and development, which compliments the approach page XII.20, replace step d with: d. Grout thickness, Dg is determined based upon a net minimum downward surplus force of 30 pounds, and 60 pounds is generally preferable. Table IX-l presents a guideline and minimum criteria. page XII-23, add to step a: 60 cis/foot can be exceeded but results in an impractical application to grass lined channels, page XII-28, Equation XI!.? replace "h" with "y" and add the sentence: Where Yr is the vertical fall from the crest to the floor of the basin in the particular zone. 2-6