Note: Some of the notation in this list is awkward because of the difficulty in moving equations into an html format, e.g., SQRT is used for the square root symbol.

Page Problem

29 Areas can't be correct in Thiessen example. Area is supposed to be area inside watershed boundary. See corrected table at end of this errata.

31 3rd line from bottom, should read "... heights for u and e_a.", not "...heights for n and e_a."

34 Include units for N in eqn. 1.13. Namely, N has units of cm/day per mb per m/s or cm-s/day-m-mb

44 5th line of text (below equation) should be: "Integrating over the interval..."

44 Eqn. 1.20. Typesetting confuses people. Reset to put k unequivocally in denominator by itself, e.g.,

                    (f_o-f_c)
F(t) = f_ct + ------- (1 - e^-kt)
                     k

46 Column heading for 6th column at top of page should use Dt, not Dt.

46 Shading in Figure E1.6b(a) at bottom of page should go all the way up to curve, and not be a rectangle.

47 Last column of table at top of page would be better as:

EQUIV-
ALENT
f
at tp
(in/hr)
------
2.22
1.21
0.71
0.52
0.36
0.28

48 Fig. E1.6b(b), lower exponential curve should be labeled f(eq. 1.19), not f(eg. 1.19).

52 Fig. 1.16, ordinates on top four figures should be labeled -cm, not cm.

56 Table 1.4, units for y should be -cm, not cm.

58 Near top of example, equal sign is missing. Should read y_f = -9.37 in.

106 Fig. E2.3(c), Time base, T_B, should start at time 0 (not 1) and extend to time 9 (not 10).

128. Last paragraph, second line: No reason to have parentheses around 1000 in equation S = 1000/CN - 10.

140 Boxed solution to Example 2.10, part b should be Q_p = 248 cfs, not 264.

141 Similarly for Example 2.10, part d, boxed answer should be 544.5 cfs, not 560.5.

158 Problem 2.4. Amend the description to:  "A small watershed has the characteristics..."

163 Problems 2.21 and 2.22.  Units of k are hr^-1.

159 Problem 2.6, Storm Data "Rainfall" should be "Rainfall Excess."

195 Eqn. 3.56, exponential within integral should be e^-lt, not e^-lt.

197 Eqn. 3.57, missing left bracket [ in exponential argument. Argument of exponential should be - (1/2)[(x-m)/s]².

200 Eqn. 3.61, argument of exponential should be s_y² . Right hand side of equation should be: exp(s_y²) - 1

200 Eqn. 3.62, incorrect argument of exponential. Argument should be m_y + s_y² /2.

200 Parenthetical statement below Eqn. 3.62 is not correct. If only base-10 data are available for logs, they must be converted to natural logs (as in Example 3.10). Eqns. 3.61 and 3.62 cannot be used with powers of 10 and base-10 logs for the mean and variance.

202 Eqn. 3.67, coefficient of variation should not be squared.  That is,

    g = 2 CV   or    C_s = 2 S_x / x-bar

208 Example 3.13, next to last line: Should read

F(10,000) = exp{-exp[-3.87x10^-4(10000-2654)]} = 0.943

(Wrong value used for 10,000 twice in the equation.)

214,215 Probability statements involving KS should be rewritten to use, say, F_p for the predicted CDF, to distinguish between F_p and the random variable F in the inequalities.

219 Third and fourth calculation in middle of page are incorrect. Should be:

            7.968 + (0.976²/2)
= e                             = 4648 cfs

              0.976²
S_Q = [(e          - 1) 4648²]^0.5 = 5865 cfs
 
 

234 Problem 3.21. "...rainfall data...were collected..."

235 Problem 3.21, part e. Question asks for 10-yr annual rainfall total.

235 Problem 3.23. Need a reference for the source of the method for outliers?

235 Problem 3.24 is poorly stated and contains notation inconsistent with rest of chapter, i.e., should be f(x), not F(X). The problem is OK and should be restated as follows:

The random variable x represents the depth of rainfall in June, July, and August in Houston. The PDF for x is symmetric in the shape of an isosceles triangle. The rising limb has the equation

 f(x) = x/1200

 a) For the above PDF, what is the mean value of summer rainfall? Sketch the complete PDF.

b) Find the probability that next summer's rainfall will not exceed 20 in.

c) Find the probability that summer rainfall will equal or exceed 30 in. for the next three consecutive summers.

244 Figure E4.2(a). The equation for orifice flow is missing the area. It should read:

Orifice flow:      Q = C A SQRT(2gH)

255 Heading atop table should be [xI+(1-x)Q], not [xI+(I-x)Q].

262 Eqn. for DH2 above block diagram should include multiplication by Dt. That is, DH2 = f(.....) Dt

266 Middle of page, definitions of Inflow and Outflow should use multiplication by Dt, not dt.

268,279,288,297,300,408,409,423,691 and likely elsewhere: St. Venant should really be Saint-Venant, a name rather than a beatification.

276 Table 4.2, first line of Engman (1986) data: Range for concrete or asphalt should be 0.01-0.013, not 0.01-0.13.

278 Table 4.3. U.S. customary units are used. The "Rectangular" should be "Square". Also, in footnote at bottom, what is A_c'? (Should be defined in an equation.) Subscript c refers to channel.

282 Eqn. 4.60, missing a slash / before the square root of S_o. That is, last part of the equation should be

     [n L / SQRT(S_o)]^0.6

283 Eqn. 4.68 should be

    t* = D{1 + (1/m)[(t_c/D)^m - 1)]}

283 Figure 4.14, left-hand top "flat part" with time dimension (t_c-D)/m is wrong.  The time dimension should be:

    (t_c* - D)/m      where t_c* = D(t_c/D)^m

327 Eqn. 5.6, Q_R is not in the equation, so defining it is confusing.

378 Example 6.1, third line, should be Eq. 1.19, not 1.18.

431 Figure 6.18. Top figures are for volume (V-65 and V-52) and lower figures are for peak (P-65 and P-52).

440 Problem 6.7 would be helped by a minor change to question b:

b) Calculate the dynamic wave speeds...

440 Problem 6.8. The area is wrong. The area should be 5.68 acres, not 5.43.

489 Fig. 7.10. Overbank is missing the "b" in the figure.

529 Figure 8.7. An artesian well and flowing well are the same thing. The artesian well in the figure is mislabeled and is just an "ordinary" well. "Artesian well" should point to the flowing well.

530 Eqn. 8.4 should be V = Q/A = -K dh/dL, that is, eliminate the minus sign before the Q/A.

532 Table 8.3. HYDRAULIC is misspelled in column heading and there is an error in the footnote:

1 m/sec = 100 cm/sec (not 1 x 10^-2 cm/sec) and there is no relationship to darcy (a unit of intrinsic permeability, as in the text). Also, the footnote would be helped by a relationship with gpd/ft². Thus, it should read:

Note on units: 1 m/sec = 100 cm/sec = 3.28 ft/sec = 2.12 x 106 gal/day-ft².

553 Figure 8.19. Arrow with r₁ should reach to center of well on right.

648 Table B.5, conversion of velocity from km/s to mi/hr. Number should be 2236.9, not 2.2369.

671 Same problem with first equation as described for page 44, Eqn. 1.20. Re-type set with k clearly in denominator.

Reversal of  f_o and f_c in second equation. It should read:

g'(t) = dg/dt = f_c + (f_o-f_c)e^-kt

Index -- add "major/minor drainage", page 372

Title page -- change Huber's affiliation to Oregon State University

Solutions Manual, problem 1.6. The Thiessen polygons are drawn incorrectly, for the most part.

Page 29, Corrected table for Thiessen example in text. Note that the conversion of areas to square miles is optional; the units of the digitizer or planimeter (e.g., square centimeters or square inches) may be used directly, since areas are only used as a ratio.

Gage	Pi	Ai	Ai/AT	(Pi)/(Ai/AT)
	(in.)	(mi2)		(in.)
A	5.13	1.74	0.062	0.32
B	6.74	6.70	0.238	1.60
C	9.00	1.77	0.063	0.57
D	6.01	13.02	0.463	2.78
E	5.56	0.83	0.029	0.16
F	4.98	2.68	0.095	0.47
G	4.55	1.42	0.050	0.23
	S	28.16	1.000	6.13

The average rainfall is 6.13 in. by the Thiessen method.

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