Flood Estimation Report

Date: 01/01/2016
Software: OH Auto Statistical

Input data

River: Dee
Location: Park
Station №: 12002
NGR outlet: 379800, 798300
NGR centroid: 335381, 793266

Catchment descriptors

Descriptor	Value	Descriptor	Value	Descriptor	Value
AREA	1833.26	FPEXT	0.0483	SPRHOST	39.69
ALTBAR	447	LDP	127.75	URBCONC1990
ASPBAR	82	PROPWET	0.58	URBEXT1990	0.0008
ASPVAR	0.07	RMED-1H	8.5	URBLOC1990
BFIHOST	0.507	RMED-1D	38.5	URBCONC2000
DPLBAR	66.96	RMED-2D	53.6	URBEXT2000	0.0016
DPSBAR	169.4	SAAR	1080	URBLOC2000
FARL	0.980	SAAR4170	1162

Annual maximum flow data

Water year	Date	Flow (m³/s)

    1973 | 30/01/1974 |        560  
    1974 | 14/01/1975 |        560  
    1975 | 30/09/1976 |        230  
    1976 | 15/10/1976 |        580  
    1977 | 11/12/1977 |        480  
    1978 | 08/12/1978 |        540  
    1979 | 04/10/1979 |        430  
    1980 | 26/09/1981 |        530  
    1981 | 02/10/1981 |        720  
    1982 | 13/10/1982 |        830  
    1983 | 01/01/1984 |        340  
    1984 | 10/11/1984 |        690  
    1985 | 03/12/1985 |        450  
    1986 | 07/12/1986 |        350  
    1987 | 18/10/1987 |        400  
    1988 | 26/10/1988 |        590  
    1989 | 05/02/1990 |        650  
    1990 | 02/01/1991 |        360  
    1991 | 31/10/1991 |        700  
    1992 | 17/01/1993 |        700  
    1993 | 08/10/1993 |        800  
    1994 | 10/09/1995 |        580  
    1995 | 09/01/1996 |        580  
    1996 | 02/03/1997 |        420  
    1997 | 18/11/1997 |        630  
    1998 | 21/09/1999 |        550  
    1999 | 27/04/2000 |        590  
    2000 | 11/10/2000 |        640  
    2001 | 29/01/2002 |        480  
    2002 | 22/11/2002 |        860  
    2003 | 08/01/2004 |        430  
    2004 | 10/01/2005 |        390  
    2005 | 03/12/2005 |        490

Median annual flood (QMED)

Analysis type: Median of annual maximum flow data
QMED: 560 m³/s

Growth curve

Methology: Kjeldsen, Jones & Bayliss (2008, eqs. 8.3‒8.12 & 8.16), Kjeldsen (2010, eqs. 10 & 11), Open Hydrology Contributors (2015)
Analysis type: Pooled catchments analysis (gauged)

Growth curve donor catchments (pooling group)

Donor river	Donor location	Sim. dist.	Rec. length	L-var.	Weight	L-skew	Weight
Dee	Park	0.00	33	0.155	0.677	0.032	0.240
Clyde	Blairston	0.27	50	0.148	0.044	0.258	0.103
Tyne	Bywell	0.29	56	0.138	0.043	0.117	0.103
Tweed	Boleside	0.33	45	0.188	0.041	0.170	0.093
Wye	Belmont	0.35	104	0.111	0.043	0.097	0.108
Spey	Grantown	0.36	63	0.173	0.041	0.089	0.098
Dee	Woodend	0.40	77	0.207	0.040	0.075	0.098
Eden	Sheepmount	0.46	46	0.185	0.037	0.192	0.085
Mourne	Drumnabuoy House	0.48	30	0.114	0.034	0.298	0.074
Total/weighted avg.			504	0.156	1.000	0.127	1.000

L-var., urban: 0.156
L-skew, urban: 0.127

Flood frequency curve

Distribution: GLO
Parameters: 1.000, 0.152, -0.127

AEP (%)	Growth factor	Flow (m³/s)
50.0	1.00	560
20.0	1.23	680
10.0	1.38	770

5.0 |          1.54 |       860  
3.3 |          1.64 |       910  
2.0 |          1.76 |       980  
1.3 |          1.87 |      1000  
1.0 |          1.95 |      1100  
0.5 |          2.15 |      1200  
0.2 |          2.44 |      1400  
0.1 |          2.68 |      1500

References

Kjeldsen, T. R., Jones, D. A. & Bayliss, A. C. (2008). Improving the FEH statistical procedures for flood frequency estimation (No. SC050050). Bristol: Environment Agency.

Kjeldsen, T. R. (2010). Modelling the impact of urbanization on flood frequency relationships in the UK. Hydrology Research, 41 (5). pp. 391‒405

Kjeldsen, T. R., Jones, D. A. & Morris, D. G. (2014). Using multiple donor sites for enhanced flood estimation in ungauged catchments. Water Resour. Res., 50, pp. 6646‒6657

Open Hydrology Contributors (2015). OH Auto Statistical. http://docs.open-hydrology.org/projects/oh-auto-statistical

faph/Dee at Park.md