Appendix 1: Waterway crossings - Home | NZ … - 5-C1814.00 Peka Peka to North Otaki 440PN Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment Printed 1/08/2012
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Peka Peka to North Ōtaki Expressway: Assessment of Stormwater Effects
5-C1814.00
February 2013
Appendix 1: Waterway crossings
Includes:
1. Catchment Map of the small and medium Waterway crossings – Drawing Sheet DR09
2. KCDC SCS method inputs to HEC HMS model
3. KCDC SCS method outputs from HEC HMS model
4. Comparison of results between SCS method and regional method.
PEKA PEKA
TE HORO BEACH
TE HORO
OTAKI BEACH
OTAKI
O
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D.
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CHAINAGE 0 ON NEW
ROAD ALIGNMENT
HADFIELD CATCHMENT
131ha.
KUMOTOTO CATCHMENT
64.3ha.
AWATEA CATCHMENT
223ha.
CORDING CATCHMENT
11.8ha.
CAVALLO CATCHMENT
20.8ha.
JEWELL CATCHMENT
360ha.
AVATAR CATCHMENT
65.7ha.
COOLEN CATCHMENT
6.5ha.
SETTLEMENT HEIGHTS
CATCHMENT 308ha.
GEAR CATCHMENT
176ha.
MANGAONE CATCHMENT
OTAKI CATCHMENT BRIDGE
OVER RIVER AT CH. 3650
RACECOURSE CATCHMENT
17.1ha.
TE MANUAO CATCHMENT
31.6ha.
GREENWOOD CATCHMENT
162ha.
WAITOHU CATCHMENT
1:200000 500 1000 2000 mat A1
200
100
5010
0mm
300
mm
ScaleProject No. Drawing No. Sheet. No.
Project
Sheet
Revision
Original Sheet Size A1 [841x594] Plot Date
Drawn Approved Revision DateDesigned
NEW ZEALAND TRANSPORT AGENCYPEKA PEKA TO NORTH OTAKI EXPRESSWAYFOR CONSENTING
Preliminary Design - Water EngineeringCatchment Area Plan to Proposed Road Alignment
5/2664/1/6504 DR09 R05-C1814.00 1:20000 at A109/08/12 @ 13:56 p:\projects\5-c1814.00 peka peka to north otaki 440pn\900 drawings\910 cad\stormwater (.32) concept plans\design updates march2011\5_2664_1_6504_dr9_r0.dwg
G.D. T. Coulman May 2012R.C.
Approved Revision DateRevision Amendment
1500
CHAINAGE 12212 ON NEW ROAD
ALIGNMENT. END OF CONTRACT
TE ROTO CATCHMENT
11.6ha.
ANDREWS CATCHMENTS 2.8 &
1.3ha.
MANGAPOURI CATCHMENT
236.6ha.
SCHOOL CATCHMENT
175ha.
NOTES:
1. CONTOUR INTERVAL IS 20m
LEGEND:
EXISTING ROADS
STREAMS/DRAINAGE DITCHES
Existing SH1
PROPOSED EXPRESSWAY
ALIGNMENT
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 1 of 15
Summary table - inputs to HEC-HMS for flow assessment
Culvert
location
Culvert
catchment
area (Km2)
Initial
abstraction
(mm)
Curve
number (CN)
Connected
Impervious
Areas (%)
Time of
Concentration
(hours)
Storage Ratios (R)Q100 24hr
depth (mm)
Ch 0+394 1.620 5.00 82 0% 1.08 0.78 175
Ch 0+825
Ch 0+935
± Ch1+650 0.316 1.50 84.3 0% 0.58 0.43 155
Ch1+940 2.366 4.00 81 8% 1.07 1.14 175
Ch 2+195 0.171 5.00 78 0% 0.25 0.37 155
Ch 2+620 0.116 5.00 78 0% 0.35 0.53 155
Ch 2+880 0.028 5.00 78 0% 0.15 0.22 155
Ch 3+020 0.013 5.00 78 0% 0.11 0.17 155
Ch 6+600
Ch 7+250
& 7+430
-
Ch 8+610 1.760 5.00 82 0% 1.19 1.45 175
Ch 8+910 3.080 5.00 80 0% 1.03 1.14 175
Ch 8+980 0.065 5.00 82 0% 0.21 0.26 165
Ch 9+370 0.657 5.00 82 0% 0.57 0.70 165
- 5.562 5.00 81 0% 0.97 1.19 175
Ch 10+020 3.600 5.00 80 0% 1.27 1.41 175
Ch 10+590 0.208 5.00 82 0% 0.35 0.52 165
Ch 10+930 0.118 5.00 82 0% 0.27 0.40 165
Ch 11+335 2.230 5.00 80 0% 1.34 1.34 175
Ch 11+630 0.643 5.00 80 0% 0.49 0.40 170
Assessment components for HEC-HMS imputs are listed below:
- 24 hour rain fall depth
- Initial abstraction
- Normalised Depth-Duration Relationship
- Soil types and Curve Numbers
- Connected Impervious area
- Storage Value (R)
- Time of Concentration
Other information used
-
- Geotec info - Preliminary soil type maps, GWRC test pit locations and GWRC test pit logs
Flows assessed by other means
Flows assessed by other means
Flows assessed by other means
Flows assessed by other means
Flows assessed by other means
Catchment map showing catchment name, aproximate culvert location and culvert catchment area
This is an assessment of inputs for peak flow calculations using HEC HMS, as detailed in SKM's
'Isohyet Based Calculation of Design Peakflows' in appendix 1 of KCDC 's Subdivision and
development principles and requirements 2005 (including the August 2008 updated rainfall analysis)
Jewell
Cavallo
Cording
Te Roto
Andrews 1
Andrews 2
Otaki
Mangaone
Gear
Settlement Heights
Coolen
Catchment name
Greenwood
Waitohu
Te Manuoa
Mangapouri
Racecourse
Gear to Jewell
combined
Avatar
Awatea
Kumototo
Waitohu tributary
School
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 2 of 15
24 hour rain fall depth
Q100 + CC to 2090
Q10 + CC to 2090
2090 Climate Affected Isohyet Maps (from Appendix B of SKM's Update of Kapiti Coast Hydrometric Analysis -
Which is an update of Appendix A, of Appendix 1, of KCDC 's Subdivision requirements 2005)
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 3 of 15
Q2 + CC to 2090
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 4 of 15
From 2090 Climate Affected Isohyet Maps: Normalised Depth-Duration Relationship
Duration
5 Mins 12 12 9 8 6 5
15 Mins 22 21 15 14 10 8
1 Hour 40 39 28 26 18 16
2 Hour 54 53 37 35 25 21
3 Hour 71 69 49 46 32 28
6 Hour 93 90 64 60 42 36
12 Hour 126 122 87 81 57 49
24 Hour 155 150 107 100 70 60
Duration
5 Mins 13 14 9 9 6 6
15 Mins 23 24 16 15 11 10
1 Hour 43 44 30 29 20 18
2 Hour 58 60 40 39 26 25
3 Hour 76 78 53 51 35 32
6 Hour 99 102 69 66 45 42
12 Hour 134 138 93 89 61 57
24 Hour 165 170 115 110 75 70
Duration
5 Mins 14 14 10 10 7 6
15 Mins 25 25 18 17 12 11
1 Hour 47 46 33 31 22 21
2 Hour 63 61 44 42 30 28
3 Hour 83 81 58 55 39 37
6 Hour 108 105 75 72 51 48
12 Hour 146 142 101 97 69 65
24 Hour 180 175 125 120 85 80
Duration
5 Mins 16 15 12 12 7 5
15 Mins 28 27 21 20 13 8
1 Hour 52 49 39 38 23 16
2 Hour 70 67 53 51 32 21
3 Hour 92 87 69 67 41 28
6 Hour 120 114 90 87 54 36
12 Hour 162 154 122 117 73 49
24 Hour 200 190 150 145 90 60
Normalised Q100 Rainfall depth
Normalised Q100 Rainfall depth
Normalised Q100 Rainfall depth
Normalised Q100 Rainfall depth
0.81
1.00
0.46
0.35
0.46
0.08
0.14
0.81
1.00
0.35
0.46
0.08
0.14
0.81
1.00
0.35
0.46
0.08
0.14
0.81
1.00
As the road and catchments are an area rather than a single point, the rainfall value veries over the area. So we
have given 4 rain fall values (not to be used for the Waitohu, otaki or Mangaone)
Normalised
Rainfall Depth
(I/I24)0.08
0.14
0.35
0.26
0.60
Normalised
Rainfall Depth
(I/I24)
0.26
0.60
Normalised
Rainfall Depth
(I/I24)
0.26
0.60
Normalised
Rainfall Depth
(I/I24)
0.26
0.60
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 5 of 15
Depth-Duration Relationship - converted to intencity
Duration
(h)
0.083333
0.25
0.5
1
2
3
6
12
24
Duration
(h)
0.083333
0.25
0.5
1
2
3
6
12
24
Duration
(h)
0.083333
0.25
0.5
1
2
3
6
12
24
Duration
(h)
0.083333
0.25
0.5
1
2
3
6
12
24
32 22 15
17
33 22
28 19 13
11
7
12
8 5
5 3
8
70 48
47
68 47 31
64 44 29
74 51 35
24
92
43
29
173 120 82
101
18
Q10 Rainfall (Southern
catchments) intencity
(mm/h)
4
82 62 37
86
rainfall Intencity
25
64
30
20
18
42
20
13
12
112 84 50
52 39
20
14 10 6
23 14
144
15 9
13 9
12 8 6
8 5
Q100 Rainfall (North half
of road) intencity (mm/h)
Q100 Rainfall (South half
of road) intencity (mm/h)
Q100 Rainfall (Northern
catchments) intencity
(mm/h)
Q100 Rainfall (Southern
catchments) intencity
(mm/h)
Q10 Rainfall (North half of
road) intencity (mm/h)
Q10 Rainfall (South half of
road) intencity (mm/h)
Q10 Rainfall (Northern
catchments) intencity
(mm/h)
8 6 4
10
6
103
60
28
31
19
16
11
7
4
87
40
27
23
35 26 16
192
67
39
18
Q2 Rainfall (North half of road)
intencity (mm/h)
Q2 Rainfall (South half of road)
intencity (mm/h)
Q2 Rainfall (Northern
catchments) intencity (mm/h)
Q2 Rainfall (Southern
catchments) intencity (mm/h)
149
12
11
7
5
3
158 110 72
16
Interpelate
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prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 6 of 15
Initial abstractionFrom seciton 2.2.2.1 (Appendix 1 of KCDC Subdivision guide)
Extract from Appendix 1 of KCDC Subdivision guide - page 8
Culvert
Location
Rural or
Urban
Initial
abstraction
(mm)
Ch 0+394 Rural 5.00
Ch 0+825 Rural 5.00 Flows assessed by other means
Ch 0+935 Rural 5.00 Flows assessed by other means
± Ch1+65070% Urban,
30% Rural1.50
Ch1+94020% Urban,
80% Rural4.00
Ch 2+195 Rural 5.00
Ch 2+620 Rural 5.00
Ch 2+880 Rural 5.00
Ch 3+020 Rural 5.00
Ch 6+600 Rural 5.00 Flows assessed by other means
Ch 7+250
& 7+430Rural 5.00
Flows assessed by other means
- Rural 5.00Flows assessed by other means
Ch 8+610 Rural 5.00
Ch 8+910 Rural 5.00
Ch 8+980 Rural 5.00
Ch 9+370 Rural 5.00
- Rural 5.00
Ch 10+020 Rural 5.00
Ch 10+590 Rural 5.00
Ch 10+930 Rural 5.00
Ch 11+335 Rural 5.00
Ch 11+630 Rural 5.00
Gear to Jewell
combined
Avatar
Jewell
Cavallo
Cording
Mangaone
Gear
Settlement Heights
Coolen
Otaki
Flows assessed by other means (NB: strictly this catchment should
be split into 2 sub catchments however this is not nessesary as this
catchment is beign assessed by other means)
Catchment name
Greenwood
Waitohu
Te Manuoa
Mangapouri
Racecourse
Awatea
Kumototo
Te Roto
Andrews 1
Andrews 2
School
Waitohu tributary
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 7 of 15
Soil types and Curve Numbers (CN)
Soil group and curve numbert table
Soil GroupCurve
number
Soil Group D -
(due to Clay)82
-
-
Soil Group D -
(due to Clay)84
Soil Group D -
(due to Clay)81
Soil Group D -
(due to Clay)78
Soil Group D -
(due to Clay)78
Soil Group D -
(due to Clay)78
Soil Group D -
(due to Clay)
78
-
-
-
Soil Group D -
(due to Clay)82
Soil Group D -
(due to Clay
and Peat)
80
Soil Group D 82
Soil Group D -
(due to Clay
and Peat)
82
Soil Group D -
(due to Clay
and Peat)
81
Soil Group D -
(due to Clay
and Peat)
80
Soil Group D 82
Soil Group D 82
Soil Group D 80
Soil Group D 80
Gear to Jewell
combinedas above 4 catchments as above 4 catchments
See Project preliminary geology map and GWRC bore logs and refer to soil class descriptions and Curve Number
Delineation Tables located in page 9 and appendix B (of Appendix 1) of KCDC 's Subdivision and development
principles and requirements 2005
Recent Alluvium - highly veriable (Logs
S25/5310, S25/5319/1 are clay,
S25/5319/2, S25/5311 are sand/gravel)
Flows assessed by other means
Description of soils from geology map
and logs
as Racecourse
as Racecourse
Terrace Alluvion (log S25/5391 - Gravel and
clay)
Awatea
Kumototo
Terrace Alluvion (logs R25/5114, R25/5116,
R25/5118, Gravel/Clay)
Flows assessed by other means
Table 2-2a - Residential districts by average lot size: 2
acres (rural lots about 1.3ha)
Cover type
Recent Alluvium - highly veriable (Logs
S25/5285 is gravel,S25/5283, S25/5287,
S25/5295, S25/5300 are clay/gravel)
as Racecourse
Fan Deposits - highly veriable (no relevent
Logs, assuming some clay)
Table 2-2a - Residential districts by average lot size: 2
acres (Potential rural lots)
Table 2-2a - Residential districts by average lot size: 2
acres (Potential rural lots)
Fan Deposits - highly veriable (Logs
R25/5111(1/2), Gravel/Clay/Peat)
Fan Deposits - highly veriable (no relevent
Logs, assuming some clay)
Fan Deposits - highly veriable (no relevent
Logs, assuming some clay)
Half Table 2-2c Brush-brush-weed-grass mixture (77),
Half Table 2-2a - Residential districts by average lot
size: 2 acres (82) potential
Half Table 2-2c Brush-brush-weed-grass mixture (77),
Half Table 2-2a - Residential districts by average lot
size: 2 acres (82) potential
Catchmet name
Greenwood
Waitohu
Flows assessed by other means
Flows assessed by other means
Te Manuoa
Gear
Settlement
Heights
Coolen
Terrace Alluvion (logs R25/5156(1/2/3),
R25/5266, R25/54045 Gravel/Clay/Peat)
as Settlemant heights
Fan Deposits - highly veriable (Logs
R25/5108(1/2), R25/5106, R25/5104,
Clay/Peat)
Fan Deposits - highly veriable (no relevent
Logs, assuming some clay)
Avatar
Jewell
Cavallo
Cording
Half Table 2-2c Brush-brush-weed-grass mixture (77),
Half Table 2-2a - Residential districts by average lot
size: 2 acres (82) potential
Waitohu
tributary
Mangapouri
Racecourse
Te Roto
Andrews 1
70% - Table 2-2a - Residential districts by average lot
size: 1/4 acre (sample 1, 28 lots in 2.2ha = 800m2)
(sample 2, 41 lots in 2.7ha = 650m2) (87)
30% - Table 2-2c - Meadow-continuous grass, Fair (78)
Table 2-2c - Meadow-continuous grass, protected from
grazing and generally mowed for hay - FairTable 2-2c - Meadow-continuous grass, protected from
grazing and generally mowed for hay - Fair
Terrace Alluvion (log S25/5297, 5391 -
Gravel and clay and 1m top soil)
School Flows assessed by other means
Table 2-2a - Residential districts by average lot size: 2
acres (large lots)
Half Table 2-2c Brush-brush-weed-grass mixture (77),
Half Table 2-2a - Residential districts by average lot
size: 2 acres (82) potential
Table 2-2a - Residential districts by average lot size: 2
acres (Potential rural lots)
Table 2-2a - Residential districts by average lot size: 2
acres (Potential rural lots)
Andrews 2
Otaki
Mangaone
1/3 - Table 2-2a - Residential districts by average lot
size: 1/4 acre (as Te Manuoa) (87)
2/3 Table 2-2c - Meadow-continuous grass, Fair (78)
Table 2-2c - Meadow-continuous grass, protected from
grazing and generally mowed for hay - Fair
Table 2-2c - Meadow-continuous grass, protected from
grazing and generally mowed for hay - Fair
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 8 of 15
Extracts from Appendix 1 of KCDC 's Subdivision and development principles and requirements 2005 (page 9
& 10)
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prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 9 of 15
Connected Impervious area
Connected Impervious area summary table
Catchment name Culvert location
Extract from Appendix 1 of KCDC 's Subdivision and development principles and requirements 2005 (page 9 & 10)
Connected Impervious area
(as a % of total area)
Greenwood Ch 0+394
0.0%
0.0%
0.0%
Andrews 2 Ch 3+020
0.0%
0.0%
0.0%
7.8%
0.0%
0.0%
0.0%
0.0%
Racecourse Ch 2+195
Te Roto Ch 2+620
Andrews 1 Ch 2+880
Otaki
Mangaone
Gear
Cavallo
Cording
Awatea
Waitohu Ch 0+825
Te Manuoa ± Ch1+650
Mangapouri Ch1+940
Ch 6+600
Ch 7+250 & 7+430
Ch 8+610
0.0%
0.0%
0.0%
Gear to Jewell
combined - 0.0%
Coolen
Avatar
Jewell
Ch 8+910
Ch 8+980
Ch 9+370
Kumototo
Ch 11+335
Ch 11+630
Ch 10+020
Ch 10+590
Ch 10+930
0.0%
0.0%
0.0%
0.0%
0.0%
Settlement Heights
input from
individual calcs
below
See note below
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prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 10 of 15
Te Manuao Catchment
Land use type
Mangapouri Catchment
Land use type
0
Area (ha)
0
Residential A
Residential B
Residential C
Connected Impervious areas - individual catchment assessment
0.00%
0 0.0%
0.00%
0.00%
0.00%
0.00%
26.3%
0
0
0
10.3
0.0%
0.0%
31.600
From KCDC stormwater pipe network maps (from the KCDC GIS) these are the only 2 catchment with conencted
inpervious areas. Images of these are below.
Impervious % (from
extract above)
38%
55%
65%
4.1%
Impervious % of total area% of total Area
24.05%
2.26%
0.00%
0.00%
0.00%
0.00%
20
1.3
0.0%
0.0%
0.0%
0.0%
% of total Area Impervious % of total area
65% 0 0.0% 0.00%
100.0%
72%
0%
5.17%
6.9% 2.63%
Town Center 50% 0.00%
Road Designation 36% 0 0.0% 0.00%
Residential B 55% 19 9.4%
0.00%
Industrial 72% 0 0.0% 0.00%
Residential C
85% 0 0.0%
7.8%
Open space/rural 0% 169 83.7% 0.00%
Hospital 72% 0 0.0% 0.00%
Total 202.000 100.0%
Commercial
educational 72% 0 0.0%
Industrial
Commercial 0
63.3%
Road Designation
Town Center
educational
Hospital
Open space/rural
Total
0.0%
32.6%
72%
Residential A 38% 14
Impervious % (from
extract above) Area (ha)
0
72%
85%
36%
50%
NB: Although Te Manuoa catchment has some reticulation, it is
too small to be significant and the majority of the stormflows
will be above ground (300l/s in pipe v Q100 flow greater than
3000l/s). As such all flow is assumed to be overland flow, and a
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 11 of 15
The only area, on this project, with relevent connected Impervious areas is at the north end as shown here.
There are no connected Impervious areas south of the Otaki racing grounds
Otaki racing grounds
Otaki River
Otaki racing grounds
connected Impervious areas
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 12 of 15
Storage Value (R)
From seciton 2.2.3.3 (Appendix 1 of KCDC Subdivision guide)
R = Tc*Ratio/(1-Ratio)
Extract from Appendix 1 of KCDC Subdivision guide - page 11
Storage ratio table
Culvert
LocationRatio Tc(hours) R
Ch 0+394 0.42 1.08 0.78
Ch 0+825 Flows assessed by other means
Ch 0+935 Flows assessed by other means
± Ch1+650 0.43 0.58 0.43
Ch1+940 0.52 1.07 1.14
Ch 2+195 0.60 0.25 0.37
Ch 2+620 0.60 0.35 0.53
Ch 2+880 0.60 0.15 0.22
Ch 3+020 0.60 0.11 0.17
Ch 6+600 Flows assessed by other means
Ch 7+250
& 7+430Flows assessed by other means
- 0.55 1.42 1.73
Ch 8+610 0.55 1.19 1.45
Ch 8+910 0.53 1.03 1.14
Ch 8+980 0.55 0.21 0.26
Ch 9+370 0.55 0.57 0.70
- 0.55 0.97 1.19
Ch 10+020 0.53 1.27 1.41
Ch 10+590 0.60 0.35 0.52
Ch 10+930 0.60 0.27 0.40
Ch 11+335 0.50 1.34 1.34
Ch 11+630 0.45 0.49 0.40
1/3 flat lands 2/3 steepland
Rural steepland
Comment
1/5 steepland 3/5 high
storage residential 1/5
flatland
30% flat lands 70% high
storage residential
flat lands
flat lands
flat lands
flat lands
2/3 flat lands 1/3 steepland
1/2 flat lands 1/2 steepland
1/5 high storage residential
4/5 flatland
Mangapouri
Racecourse
Te Roto
Andrews 1
Andrews 2
Otaki
Mangaone
Awatea
Catchment name
Greenwood
Waitohu
Kumototo
Te Manuoa
Gear
Settlement Heights
2/3 flat lands 1/3 steepland
Waitohu tributary
1/5 high storage residential
4/5 flatland
1/2 flat lands 1/2 steepland
flat lands
flat lands
Gear to Jewell
combined 2/3 flat lands 1/3 steepland
2/3 flat lands 1/3 high
storage residential
Coolen
Avatar
Jewell
Cavallo
Cording
School
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 13 of 15
Time of Concentration (tc)From seciton 6.4 (Appendix 1 of KCDC Subdivision guide)
Extracts from Appendix 1 of KCDC Subdivision guide
Summary table of Time of concentratoin
Culvert
Location
overland
flow
(minutes)
pipe flow
(minutes)tc (minutes)
Ch 0+394 0 65
Ch 0+825 - -
Ch 0+935 - -
± Ch1+650 0 35
Ch1+940 0 64
Ch 2+195 0 15
Ch 2+620 0 21
Ch 2+880 0 9
Ch 3+020 0 7
Ch 6+600 - -
Ch 7+250
& 7+430- -
- 0 85
Ch 8+610 0 71
Ch 8+910 0 62
Ch 8+980 0 13
Ch 9+370 0 34
- 0 58
Ch 10+020 0 76
Ch 10+590 0 21
Ch 10+930 0 16
Ch 11+335 0 80
Ch 11+630 0 30
NB: Overland flow + open channel flow time selected from below.
Gear to Jewell combined 58 0
-
0
0
0
0
Racecourse
Te Roto
Andrews 1
0
-
-
21
9
7
Flows assessed by other means
Flows assessed by other means
0
0
0
0
open channel flow
(minutes)
kerb and channel flow
(minutes)Catchemnt name
0Greenwood
Waitohu
School 85 0
Te Manuoa
Mangapouri
0
Flows assessed by other means (DHI
medeling and flow measurments)
35
64
15
65
Waitohu tributaryFlows assessed by other means (DHI
medeling and flow measurments)-
71
62
13
34
76
21
Andrews 2
Otaki
80
Mangaone
30
Gear
Settlement Heights
Coolen
Avatar
Jewell
Cavallo
Cording
Awatea
Kumototo
0
0
0
0
0
16
NB: Although Te Manuoa catchment has some reticulation, it is
too small to be significant and the majority of the stormflows
will be above ground (200l/s in pipe v a total flow greater than
3000l/s). As such all flow is assumed to be overland flow.
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 14 of 15
Time of concentratoin Table (verious methods)
89 29
25
Gear to Jewell
combined64 24 58 25
Avatar 38 16
Cording 18 7
Jewell 84
Awatea
Coolen 14 7 13 7
34 17
80 30
Kumototo 33 11 30 11
28 76 30
Cavallo 23 9 21
Gear 79 30 71 32
tc =
58 L / (A0.1
Se0.2
)
tc =
3.98 L0.77
(Se-0.385
)
Te Manuoa
Mangapouri
Racecourse 16 10
8 5 7 5
Otaki -
11
20
3671
Greenwood
Waitohu
65
Catchemnt name tc =
56.868 (L3 / H)
0.385
Settlement Heights 68 24 62
27
-
Te Roto 23 16 21 17
Andrews 1 10 7 9 7
15
38 20 35
71 26
- -
10
16 7
Andrews 2
Mangaone
Flows assessed by other means -Waitohu tributary
-
Standard Method for
Rural Catchments
(minutes)
Ramser-Kirpich Method
(minutes)
Bransby-Williams Method
(minutes)
-
-Flows assessed by other means
Flows assessed by other means
Flows assessed by other means
34 64
US Soil Conservation Service
Method (minutes)
School 94 43 85 45
KCDC Preferred method
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - waterway culvert - inputs to HEC-HMS for flow assessment
Printed 1/08/2012
Page 15 of 15
Catchment perameters table (for ToC)
Culvert
LocationLength (Km) Area (km
2) Slope
(m/km)
Top Lvl (m)
(at 90% of
catchment
lenth)
Top Lvl (m)
(top of
catchment)
Bottom Lvl (m) Comments
Ch 0+394 3.00 1.620 67.4 205 245 23 -
Ch 0+825 Flows assessed by other means
Ch 0+935 Flows assessed by other means
± Ch1+650 1.04 0.316 17.1 45 69 29 -
Ch1+940 2.50 2.366 23.6 65 90 12 -
Ch 2+195 0.40 0.171 13.6 17 18 12 -
Ch 2+620 0.45 0.116 5.2 16 17 14 -
Ch 2+880 0.18 0.028 8.6 15 16 14 Soakage
Ch 3+020 0.13 0.013 8.5 15 15 14 Soakage
Ch 6+600 Flows assessed by other means
Ch 7+250
& 7+430Flows assessed by other means
- 3.12 1.750 20.3 75 300 18under link
rd only
Ch 8+610 3.15 1.760 50.9 160 290 16 -
Ch 8+910 3.35 3.080 108.1 340 440 14 -
Ch 8+980 0.37 0.065 34.8 26 26 15 -
Ch 9+370 1.35 0.657 46.1 73 90 17 -
- 3.35 5.562 108.1 340 440 14downstream
conditions
Ch 10+020 4.20 3.600 107.4 425 545 19 -
Ch 10+590 0.78 0.208 64.1 60 68 15 -
Ch 10+930 0.60 0.118 82.2 60 68 16 -
Ch 11+335 4.20 2.230 105.5 415 585 16 -
Ch 11+630 1.50 0.643 166.7 240 364 15 -
NB:
- Length is measured along main channel
- For slope, Top Level is taken from 90% of the main channel length
- Slope is based on using 90% of the main channel length
Gear to Jewell
combined
Racecourse
Catchemnt name
Greenwood
Waitohu
Te Manuoa
Mangapouri
Cording
Awatea
Kumototo
Andrews 2
Otaki
Mangaone
Gear
Settlement Heights
Coolen
Avatar
Jewell
Cavallo
Te Roto
Andrews 1
School
Waitohu tributary
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530 Stormwater\530.43 -
prelim\03 - Workings and drafts\03 - Culvert Flows\01 - HEC inputs table 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 1 of 18
Summary of flows (inc. climit change to 2090)
Culvert location Q10 Peak flow (m3/s)Q100 Peak flow
(m3/s)Ch 0+394 8.6 13.3
Ch 0+825 Flows assessed by other means
Ch 0+935 Flows assessed by other means
± Ch1+650 2.0 3.2
Ch1+940 Flows assessed by other means
Ch 2+195 1.1 1.8
Ch 2+620 0.6 1.0
Ch 2+880 0.2 0.4
Ch 3+020 0.1 0.2
Ch 6+600 Flows assessed by other means
Ch 7+250 & 7+430 Flows assessed by other means
- Flows assessed by other means
Ch 8+610 6.6 11.0
Ch 8+910 12.5 21.1
Ch 8+980 0.6 0.9
Ch 9+370 3.5 5.7
Ch 10+020 17.7 21.8
Ch 10+590 1.3 2.2
Ch 10+930 0.9 1.4
Ch 11+335 8.2 13.7
Ch 11+630 4.0 6.4
The following pages capture the output graphs generated in HEC-HMS.
Cavallo
Cording
Awatea
Kumototo
Mangaone
Gear
Settlement Heights
Coolen
Avatar
Jewell
School
This is s summary of the outputs from HEC-HMS following the SCS method for flow
assessment, as detailed in SKM's 'Isohyet Based Calculation of Design Peakflows' in
appendix 1 of KCDC 's Subdivision and development principles and requirements 2005
(including the August 2008 updated rainfall analysis)
Waitohu tributary
Otaki
Summary table - Outputs from HEC-HMS for culvert flows,
(Climate change inclusive to 2090 using mean MfE guidance)
Catchmet name
Greenwood
Waitohu
Te Manuoa
Mangapouri
Racecourse
Te Roto
Andrews 1
Andrews 2
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 2 of 18
Greenwood
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 3 of 18
Racecource
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 4 of 18
Te Manuao
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 5 of 18
Mangapouri (For comparison of hydrological methods only)
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 6 of 18
Te Roto
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 7 of 18
Andrews A (or 1)
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 8 of 18
Andrews B (or 2)
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 9 of 18
Gear
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 10 of 18
Settlement Heights
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 11 of 18
Coolen
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 12 of 18
Avatar
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 13 of 18
Gear to Avatar combined
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 14 of 18
Jewell
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 15 of 18
Cavallo
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 16 of 18
Cording
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 17 of 18
Awatea
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
Project - 5-C1814.00 Peka Peka to North Otaki 440PN
Element - Stomwater - culvert flows - Outputs from HEC-HMS
Printed 1/08/2012
Page 18 of 18
Kumototo
\\wesv01\branchlib\projects\5-C1814.00 Peka Peka to North Otaki 440PN\500 Technical\530
Stormwater\530.43 - prelim\03 - Workings and drafts\03 - Culvert Flows\03 - HEC outputs 2012 07 19.xlsx
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