### Corrigenda

All significant FEH corrigenda notified by CEH are listed in the tables below.

## Volume | ## Chapter / Page | ## Error | ## Noted |
---|---|---|---|

1 | 5/21 | The reference in the last paragraph of Section 5.6 should read (see 3 10 and 4 7.3.2), not (see 3 10 and 4 7.3.1) | 28/4/00 |

1 | 10/52 | Figure 10.1 - the vertical axes should read 'Flood peak (m^{3}s^{-1})' | 24/9/02 |

2 | 2/6 | Brackets have been omitted from the numerator term of Equation (2.6), which should read: In | 8/5/02 |

2 | 2/6 | In the third sentence of Section 2.4, replace the word 'consistent' by 'internally consistent' | 21/6/00 |

2 | 3/9 | The first sentence of section 3.3 should read previous chapter, not previous section | 28/4/00 |

2 | 8/39 | The factor 0.005 in Equation (8.5) is wrong. The correct value is 0.05 | 10/7/01 |

2 | 9/43 | Figure 9.2 is not correct. Figure 9.3 has been duplicated in place of the correct Figure 9.2 | 23/7/01 |

2 | 10/51 | Within Table 10.1, the 'Duration (hours)' value of 16 is wrong. The correct value is 8 (as shown correctly in Table 2.1 on page 8 of FEH Volume 2). | 10/7/01 |

2 | 15/87 | Section numbering shown as 15.6 should be 15.7 (ditto on Contents page vii) | 4/2/02 |

2 | 1/101 | The heading for the second block of data should be 'South-west England' not 'South-east England' | 10/10/01 |

3 | 11/69 | With Example 11.2, the vertical axis should read 'Flood peak (m^{3}s^{-1})' | 24/9/02 |

3 | 12/88 | The 'In' function within equations 12.15 and 12.18 should be replaced by '-In' | 11/7/00 |

3 | 12/89 | In Example 12.4, the 'In' function in the expressions for calculating RV_{7} and RV_{8} should be prefixed by a minus sign. The numerical values resulting should be of opposite sign to that shown, ie RV_{7} = +0.112, RV_{8}= -0.060 | 11/7/00 |

3 | 13/101 | The 10th (bottom) line of Table 13.1 should be assigned as 0.0198^{RESHOST} and not RESHOST. The contents of the line have also been 'reversed' and should read: 1.81 1.12 1.01 0.93 0.48 | 19/3/02 |

3 | 13/106 | Caption to Figure 13.2 should include: (3463 'ungauged' catchments) rather than 'gauged' | 1/2/02 |

3 | 13/117 | The beginning of the fourth line should read '13.6 - 13.8' not '13.6 - 3.8' | 4/8/04 |

3 | 14/136 | Figure 14.3 - the vertical axes should read 'Flood peak (m^{3}s^{-1})' | 24/9/02 |

3 | 15/146 | In the paragraph below Equation 15.12, the third sentence should read 'If k < 0 the distribution is known as a type II GEV distribution'. The fourth sentence should begin 'If k > 0, the distribution is known as a type III GEV distribution'. | 26/3/04 |

3 | 15/150 | Within Equation 15.44 a minus sign is missing so that the parameter k is defined as k = -t3[...]. Within Equation 15.45 the last term within curly brackets in the denominator is incorrectly shown as 1-exp (-k^{2}/2). It should read 1-exp (k^{2}/2). | 8/10/04 |

3 | 16/154 | Within Section 16.1.3, under the sub-heading: Choosing an appropriate size of pooling-group, the words 'longest return period', should be replaced by 'return period for which the flood frequency estimate is principally required'. | 8/10/04 |

3 | 16/156 | Within Section 16.2.2, line 7 of the last paragraph should read: 'which ranges from 0.17 to 1' | 24/9/02 |

3 | 16/163 | Within Equation 16.8, the superscripts on t_{2} and t_{3} should be P, not R | 24/9/02 |

3 | 16/180 | The reference in the second sentence (Bayliss and Jones, 1994) should read (Bayliss, 1994). It has been omitted from the references listed on page 282 and should have been included there as: Bayliss, A C, 1994. On the variability of flood occurrence. Report to MAFF, Institute of Hydrology, Wallingford, UK. | 28/6/00 |

3 | 22/264 | Within Figure 22.2, the two diagrams labelled (a) and (b) have been transposed. Fig 22.2(a) is in fact the Annual maximum data, while Fig 22.2(b) illustrates the POT records. | 10/5/00 |

3 | 22/269 | Within the first sentence of Section 22.5.3, 'extending holdings' should read 'extending pre-FEH holdings' | 26/6/00 |

3 | 18/198 | Equation 18.13 should read: In UAF = g In (1+URBEXT) + In PRUAF | 3/10/05 |

4 | 2/20 | In Figure 2.5, the annotation should read: | 18/7/00 |

4 | 2/23 | The top line of the equation at the top of the page should read: '= ∑pi (i -δT/2)' | 7/2/02 |

4 | 2/24 | The exponents used in the intermediate step of example 2.3a are incorrect as listed. The line should read: Tp(0) = 4.270 (101.40) The answer, 3.80 hours, is correct as shown | 24/7/00 |

4 | 3/55 | Line 5 should read 'D/Tp ratios between 1.4 and 3.4', not '...between 1.4 and 5.0'. | 18/7/00 |

4 | 3/55 | The y-axis scale on the graph in Figure 3.10 is a factor of 10 times too large; it should run from 0.25 to 0.60 (rather than 2.5 to 6.0). | 22/7/02 |

4 | 4/69 | The title of the top part of Table 4.2 should read 'Winter PMP as % of all-year value' NOT '...all-year 1-hour value'. | 4/2/02 |

4 | 6/101 | Near the start of Section 6.2, URBEXT should be assigned the value 0.038 and not 0.077. | 7/6/00 |

4 | 6/109 | Step 3: The API5 calculation equation, and computed answer, are incorrect. The equation should read: API5 = √0.5 [P API5 = √0.5 [5.4 + (0.5) 33.3 + (0.5) The incorrect value of 10.8mm has been used in the remainder of the example, so the suggestion is to consider the example as simply illustrating the technique for a value of API5=10.8mm. | 7/6/00 |

4 | 6/111 | The first sentence of Step 9 should refer to BF from Step 8, not from Step 7. | 28/4/00 |

4 | 9/136 | In Example 9.1, the DPSBAR values for the total catchment and East subcatchment are quoted as 101.40 m/km and 76.29 m/km but the equivalent values abstracted from the FEH CD-Rom are 145.90 m/km and 138.60 m /km respectively. It is unclear where this discrepancy originated. The incorrect values of 101.40 m/km and 76.29 m/km have been used in the remainder of the example, so the suggestion is to consider the example as simply illustrating the technique assuming these values. | 22/7/02 |

4 | Appx A/163 | Equation A.2 is incorrect. It should be: API5 = √0.5 [P | 7/6/00 |

4 | Appx A/164 | Example A.1c. API5 equations should read: API5 = √0.5 [P API5 = √0.5 [3.0 + (0.5)0.0 + (0.5) | 7/6/00 |

4 | Appx A/191 | 'g mean' for station 33045 should be 17.4 and not 7.4 as shown | 22/10/01 |

4 | Appx C/247 | Under RSMD - the equation to estimate ARF is incorrectly given as ARF = exp (- 0.020 AREA) | 16/8/06 |

4 | Appx D/275 | Equation D.3 should read 'A (dh/dt) = i + A_{p-q}'not 'A (ds/dh) = I + A _{p-q}' | 18/7/00 |

4 | Appx D/276 | Equation D.8. Delete the term (dS/dh) and replace it by (dh/dt). | 18/7/00 |

4 | 8/124 | In Example 8.1, SPR from HOST is incorrectly shown in two places as 36.5%. The correct value is 52.6%. The incorrect value of 36.5% has been used throughout the example, so the suggestion is to consider the example as simply illustrating the technique for a value of SPR = 36.5%. | 7/2/01 |

5 | 6/53 | Equation 6.8 - the term within the parentheses is in radians. | 30/6/05 |

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Corrections to the Defra/EA R&D Technical Report FD1913/TR "*Revitalisation of the FSR/FEH rainfall-runoff method*" are listed below. The report is available on the Defra website: enter "FD1913" in the box entitled 'Project search by', then select the Technical Report "Revitalisation of the FSR/FEH rainfall runoff method".

## Chapter / Page | ## Error | ## Noted |
---|---|---|

5/56 | Equation 5.5. Missing "-" in front of ∅ for winter. See Eq. (G.3) for the correct form. | 14/6/06 |

8/89 | Wrong Tp equation: it should be Tp = 1.563 PROPWET ^{-1.09} DPLBAR^{0.6} (1+URBEXT)^{-3.34} DPSBAR^{-0.28} | 6/6/06 |

5/21 | Table G.1. Values of a for 2h, 6h and 1d should be negative. | 14/6/06 |

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## FAQs and Support Information

Where can I buy the Flood Estimation Handbook and the related software/digital data?

- The Flood Estimation Handbook and WINFAP-FEH can be purchased on the Wallingford HydroSolutions website*.

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* Sales and support of the *Flood Estimation Handbook* and related software are provided by Wallingford HydroSolutions. Links to buy these products will take you to an external website.