High intensity rainfall and a vivid electrical storm brought extraordinary floods to the area within a 30 mile (48 km) radius of Gisborne. 21 lives were lost when the Kopuawhara Stream rose rapidly and wiped out Kopuawhara No.4 workers camp. Another life was lost in Boyd's Camp near Muriwai.
Pressures were high to the south of New Zealand and low to the north, with north-east flow over the North Island. A mesoscale low developed off Gisborne within this flow, then moved southwards. There was torrential rain from East Cape to Hawkes Bay and southwards to Cook Strait. Electrical activity was a major contributor to heavy rain.
On the 18th a 15 year old girl was believed to have drowned in the the Otara River.
High intensity rainfall and a vivid electrical storm brought extraordinary floods to the area within a 30 mile (48 km) radius of Gisborne. Rainfall was confined to tops of ridges, 4 miles (6 km) and 12 miles (19 km) to the north and south of Gisborne.
Ridges had only grassland cover and the heavy rain caused considerable scour. Large boulders, logs, stumps and other debris were transported onto the downstream grass flats.
The total damage to roads in the Gisborne district was £43,800 ($4,000,000 2009 dollars).
Arakihi Station recorded 8.12 in (20.62 cm) of rain on the 18th.
Gisborne recorded 4.64 in (11.79 cm) of rain in 24 hours ending 9:00am on the 19th.
The Signal Station in Gisborne recorded 3.60 in (9.14 cm) of rain on the 18th.
The Signal Station in Gisborne recorded 263 mm (26.3 cm) of rain over three days (which has a return period of 65 years).
Telegraph communication from Gisborne to other parts of the North Island was dislocated.
The Waimata and Taruheru rivers flowing through Gisborne were in high flood.
Glenroy Station recorded 4.87 in (12.37 cm) of rain on the 19th.
Flood debris was suspended from a telephone line about 18 m above the rivers normal level.
Water was slightly above the deck of both Mangakaiwharangi highway bridges.
Mangakotukutuku Stream changed its course.
Maungakotukutuku Stream recorded a freak discharge. The measured discharge was equivalent to a rainfall rate of 132 mm an hour over an area of 19 km^2.
Mangarara Station recorded 4.75 in (12.07 cm) of rain on the 19th.
The road in Fitzgerald's Gorge fell away due to a washout.
Mangatuna recorded 7.62 in (19.35 cm) of rain ending 7:30am on the 19th.
There was water in the settlement of up to 5 ft (1.52 m). Houses which were usually well above the flood level were 2 to 3 ft (0.61-0.91 m) deep in water.
Low level bridges were completely out of sight.
Arikihi road was impassable.
Tauwhareparae Road was blocked by slips.
The coast road north of Mangatuna was impassable.
The locality was one large sheet of water.
Houses were isolated.
Kumara and maize crops were ruined.
Maraetaha River had a discharge 25,200 cusecs (714 cumecs) with a catchment area of 16.8 sq miles (44 km^2).
Within the Maraetaha catchment all main highway bridges were overtopped. Two lower bridges were swept away and the flood level was 3.2 ft (0.98 m) above the deck of the No. 3 bridge.
Flood levels at the sites of the Maraetaha bridges on Napier-Gisborne railway were 9 to 20.6 ft (2.74-6.28 m) above previous known flood levels
Fences were flattened and hundreds of acres of grass paddocks were strewn with timber and silt.
Motu recorded 2.75 in (6.99 cm) of rain in 22.5 hours ending 7:30am on the 19th.
The main road to Opotiki via Motu was blocked.
Motu River flowed over the road.
It was the biggest flood in living memory.
A minor cloudburst developed in the hills behind Muriwai and caused flooding.
Two wooden bridges between Muriwai and Kopua were swept away.
There were many losses of cattle and sheep which were trapped in low-lying paddocks.
The main highway from Gisborne to Napier beyond Muriwai was a sea of silt and small timber.
Telephone and telegraph poles down on the main south road and communication to the south was cut off.
Low-lying country between Muriwai and Manutuke was flooded.
Boyd's Camp , a small railway camp below the Mangakotukutuku confluence near Muriwai, flooded and one life was lost. Nine huts which were on the lower bank were washed away. The flat which the huts were on were covered with silt and debris and the camp was wiped out.
Ngatapa recorded 3.20 in (8.13 cm) of rain in 24 hours ending at 9:00am on the 19th.
Ngatapa Creek overflowed its banks and flooded all the lower flats.
Stock losses were minor.
Pakarae River had a discharge 25,100 cusecs (711 cumecs) at Arakihi Homestead with a catchment area of 30 sq miles (78 km^2).
There was widespread damage in Poverty Bay.
Rivers and streams were flooded.
Stock and crop damage was extensive.
Fences were brought down in a number of localities.
Bridges were destroyed.
Puninga recorded 8.03 in (20.40 cm) of rain on the 19th.
Tolaga Bay recorded 194 mm (19.4 cm) of rain in 24 hours on the 19th (which has a return period of 20 years).
There were tremendous falls of rain.
The township was isolated.
Uawa River had a record flow.
Deep deposits of silt were left on the flats.
A 40 year old timber truss bridge was carried away in the Mangaheia tributary.
All rivers and streams of the Uawa were in high flood.
Waihora Stream was in flood.
Creek at the back of "The Bungalow" changed its course.
Waipaoa River reached a dangerous level and overflowed its banks.
A large amount of timber was coming down the river.
Waipaoa River had a discharge of 55,500 cusecs (1572 cumecs) at Kanakanaia with a catchment area 606 sq miles (1570 km^2).
The Waipaoa River flood was considered a record. It reached 19.5 ft (5.94 m) at Kanakanaia Bridge and burst banks in the lower reaches. The level rose 4 in (10.2 cm) above the 1932 flood level.
Waipaoa River was 10 ft (3.05 m) deep at Kemps Bridge.
A substantial amount of damage was done on lands adjacent to the river.
Water overflowed a wide area between Manutuke and the river mouth on one side, and The Willows settlement and the Awapuni lagoon on the other bank.
There were losses of crops and stock.
Wairakaia Stream overflowed and the valley was a sea of mud and debris.
Fences were wiped out.
The bridge over Wairakaia Stream disappeared completely.
Wairongomai Station recorded 9.72 in (24.69 cm) of rain in 24 hours on the 16th.
Wairongomai Station recorded 3.65 in (9.27 cm) of rain in 24 hours on the 17th.
Wairongomai Station recorded 1.40 in (3.56 cm) of rain in 24 hours on the 18th.
Wairongomai Station recorded 9.78 in (24.87 cm) of rain in 24 hours on the 19th.
The floods in Hawke's Bay were associated with the disastrous floods in Poverty Bay.
A cloudburst in the back country on the 19th turned the Kopuawhara Stream into a raging torrent and it overflowed its banks.
At 3:00am on the 19th, a sudden flood 5 m high swept through the single mans sleeping quarters of the Kopuawhara No.4 Ministry of Works railway construction camp. The camp was located 35 miles (56 km) north of Wairoa in Poverty Bay approximately 4 m above the normal water level of the stream.
11 men took what they thought was refuge on a large truck, however it toppled over and all drowned. There were 21 casualties from the event (20 men and 1 woman). The men were aged: 55, 32, 56, 31, 28, 51, 25, 22, 35, 40, 51, 28, 40, 37, 44, 49, 65, 31, 25, one single mans age was unknown, the female was aged 21).
Bridges and approaches were damaged.
Communication and power was cut.
There was damage to houses, huts and tents, the blacksmith shop, the bathhouse destroyed and complete houses were demolished by the floodwaters. 50 or so tents and huts were flattened. There was huge property losses and nothing could be salvaged from the camp. The flood waters left huge boulders in places on the flat.
Men were forced onto roofs to escape the floodwaters.
The estimated speed of the Kopuawhara Stream was 35 mph (56 km/hr).
Roads were washed out.
Thousands of sheep and cattle drowned. 3000 sheep were lost as a result of the flood.
1000 acres (405 ha) of pasture lands was submerged.
After destroying No.4 camp the torrents turned to No.2 camp (three miles downstream) where floodwaters raced through huts. There were no lives lost there.
The flood from the river continued its course through open country to the sea. It gradually lost its momentum, but devastated a wide area of pasture by its deposits of driftwood, debris and silt.
No.5 Camp escaped the full force of the storm. But the road between No.5 camp and the big tunnel was washed completely away in places.
Kopuawhara Stream had an estimated peak discharge of 34,000 cusecs (963 cumecs) with a catchment area of 15.54 sq miles (4025 km^2) compared to the normal discharge of 22 cusecs (0.6 cumecs).
Kopuawhara Stream caused considerable scour in the valley.
Maraekakaho recorded 3.75 in (9.53 cm) of rain.
Ngaroruru River overflowed and inundated a large area of land near Pakowai.
Ngaroruru River had a peak discharge of 70,000 cusecs (1982 cumecs) at Fernhill Bridge.
Napier recorded 2.36 in (5.99 cm) of rain in 24 hours.
Tarawera recorded 7.86 in (19.96 cm) of rain on the 19th.
Tarewa recorded 200 mm (20.0 cm) of rain in 24 hours (which has a return period of 10 years).
Whanawhana recorded 2.33 in (5.92 cm) of rain.
Eastern Wairarapa experienced a torrential downpour on the 19th causing flooding of stream and rivers in the area.
Miles of fences were flattened.
Stock losses were small. One settler lost 400 ewes.
Many bridges demolished or damaged.
The Tinui and Whakataki districts suffered most in the flood.
Flat Point recorded 2.73 in (6.93 cm) of rain in three hours.
Kaiwhata Stream rose 20 ft (6.01 m).
Ngahape Bridge was washed away.
Masterton recorded 1.32 in (3.35 cm) of rain in three hours.
No serious flooding occurred although the streets were awash at one period.
Tinui River rose at a rate of one foot (0.3 m) a minute.
Several houses were flooded.
Numerous flood gates were destroyed and miles of fencing was destroyed.
High intensity rainfall and a vivid electrical storm brought extraordinary floods to the area within a 30 mile (48 km) radius of Gisborne. 21 lives were lost when the Kopuawhara Stream rose rapidly and wiped out Kopuawhara No.4 workers camp. Another life was lost in Boyd's Camp near Muriwai.
Pressures were high to the south of New Zealand and low to the north, with north-east flow over the North Island. A mesoscale low developed off Gisborne within this flow, then moved southwards. There was torrential rain from East Cape to Hawkes Bay and southwards to Cook Strait. Electrical activity was a major contributor to heavy rain.
On the 18th a 15 year old girl was believed to have drowned in the the Otara River.
High intensity rainfall and a vivid electrical storm brought extraordinary floods to the area within a 30 mile (48 km) radius of Gisborne. Rainfall was confined to tops of ridges, 4 miles (6 km) and 12 miles (19 km) to the north and south of Gisborne.
Ridges had only grassland cover and the heavy rain caused considerable scour. Large boulders, logs, stumps and other debris were transported onto the downstream grass flats.
The total damage to roads in the Gisborne district was £43,800 ($4,000,000 2009 dollars).
Arakihi Station recorded 8.12 in (20.62 cm) of rain on the 18th.
Gisborne recorded 4.64 in (11.79 cm) of rain in 24 hours ending 9:00am on the 19th.
The Signal Station in Gisborne recorded 3.60 in (9.14 cm) of rain on the 18th.
The Signal Station in Gisborne recorded 263 mm (26.3 cm) of rain over three days (which has a return period of 65 years).
Telegraph communication from Gisborne to other parts of the North Island was dislocated.
The Waimata and Taruheru rivers flowing through Gisborne were in high flood.
Glenroy Station recorded 4.87 in (12.37 cm) of rain on the 19th.
Flood debris was suspended from a telephone line about 18 m above the rivers normal level.
Water was slightly above the deck of both Mangakaiwharangi highway bridges.
Mangakotukutuku Stream changed its course.
Maungakotukutuku Stream recorded a freak discharge. The measured discharge was equivalent to a rainfall rate of 132 mm an hour over an area of 19 km^2.
Mangarara Station recorded 4.75 in (12.07 cm) of rain on the 19th.
The road in Fitzgerald's Gorge fell away due to a washout.
Mangatuna recorded 7.62 in (19.35 cm) of rain ending 7:30am on the 19th.
There was water in the settlement of up to 5 ft (1.52 m). Houses which were usually well above the flood level were 2 to 3 ft (0.61-0.91 m) deep in water.
Low level bridges were completely out of sight.
Arikihi road was impassable.
Tauwhareparae Road was blocked by slips.
The coast road north of Mangatuna was impassable.
The locality was one large sheet of water.
Houses were isolated.
Kumara and maize crops were ruined.
Maraetaha River had a discharge 25,200 cusecs (714 cumecs) with a catchment area of 16.8 sq miles (44 km^2).
Within the Maraetaha catchment all main highway bridges were overtopped. Two lower bridges were swept away and the flood level was 3.2 ft (0.98 m) above the deck of the No. 3 bridge.
Flood levels at the sites of the Maraetaha bridges on Napier-Gisborne railway were 9 to 20.6 ft (2.74-6.28 m) above previous known flood levels
Fences were flattened and hundreds of acres of grass paddocks were strewn with timber and silt.
Motu recorded 2.75 in (6.99 cm) of rain in 22.5 hours ending 7:30am on the 19th.
The main road to Opotiki via Motu was blocked.
Motu River flowed over the road.
It was the biggest flood in living memory.
A minor cloudburst developed in the hills behind Muriwai and caused flooding.
Two wooden bridges between Muriwai and Kopua were swept away.
There were many losses of cattle and sheep which were trapped in low-lying paddocks.
The main highway from Gisborne to Napier beyond Muriwai was a sea of silt and small timber.
Telephone and telegraph poles down on the main south road and communication to the south was cut off.
Low-lying country between Muriwai and Manutuke was flooded.
Boyd's Camp , a small railway camp below the Mangakotukutuku confluence near Muriwai, flooded and one life was lost. Nine huts which were on the lower bank were washed away. The flat which the huts were on were covered with silt and debris and the camp was wiped out.
Ngatapa recorded 3.20 in (8.13 cm) of rain in 24 hours ending at 9:00am on the 19th.
Ngatapa Creek overflowed its banks and flooded all the lower flats.
Stock losses were minor.
Pakarae River had a discharge 25,100 cusecs (711 cumecs) at Arakihi Homestead with a catchment area of 30 sq miles (78 km^2).
There was widespread damage in Poverty Bay.
Rivers and streams were flooded.
Stock and crop damage was extensive.
Fences were brought down in a number of localities.
Bridges were destroyed.
Puninga recorded 8.03 in (20.40 cm) of rain on the 19th.
Tolaga Bay recorded 194 mm (19.4 cm) of rain in 24 hours on the 19th (which has a return period of 20 years).
There were tremendous falls of rain.
The township was isolated.
Uawa River had a record flow.
Deep deposits of silt were left on the flats.
A 40 year old timber truss bridge was carried away in the Mangaheia tributary.
All rivers and streams of the Uawa were in high flood.
Waihora Stream was in flood.
Creek at the back of "The Bungalow" changed its course.
Waipaoa River reached a dangerous level and overflowed its banks.
A large amount of timber was coming down the river.
Waipaoa River had a discharge of 55,500 cusecs (1572 cumecs) at Kanakanaia with a catchment area 606 sq miles (1570 km^2).
The Waipaoa River flood was considered a record. It reached 19.5 ft (5.94 m) at Kanakanaia Bridge and burst banks in the lower reaches. The level rose 4 in (10.2 cm) above the 1932 flood level.
Waipaoa River was 10 ft (3.05 m) deep at Kemps Bridge.
A substantial amount of damage was done on lands adjacent to the river.
Water overflowed a wide area between Manutuke and the river mouth on one side, and The Willows settlement and the Awapuni lagoon on the other bank.
There were losses of crops and stock.
Wairakaia Stream overflowed and the valley was a sea of mud and debris.
Fences were wiped out.
The bridge over Wairakaia Stream disappeared completely.
Wairongomai Station recorded 9.72 in (24.69 cm) of rain in 24 hours on the 16th.
Wairongomai Station recorded 3.65 in (9.27 cm) of rain in 24 hours on the 17th.
Wairongomai Station recorded 1.40 in (3.56 cm) of rain in 24 hours on the 18th.
Wairongomai Station recorded 9.78 in (24.87 cm) of rain in 24 hours on the 19th.
The floods in Hawke's Bay were associated with the disastrous floods in Poverty Bay.
A cloudburst in the back country on the 19th turned the Kopuawhara Stream into a raging torrent and it overflowed its banks.
At 3:00am on the 19th, a sudden flood 5 m high swept through the single mans sleeping quarters of the Kopuawhara No.4 Ministry of Works railway construction camp. The camp was located 35 miles (56 km) north of Wairoa in Poverty Bay approximately 4 m above the normal water level of the stream.
11 men took what they thought was refuge on a large truck, however it toppled over and all drowned. There were 21 casualties from the event (20 men and 1 woman). The men were aged: 55, 32, 56, 31, 28, 51, 25, 22, 35, 40, 51, 28, 40, 37, 44, 49, 65, 31, 25, one single mans age was unknown, the female was aged 21).
Bridges and approaches were damaged.
Communication and power was cut.
There was damage to houses, huts and tents, the blacksmith shop, the bathhouse destroyed and complete houses were demolished by the floodwaters. 50 or so tents and huts were flattened. There was huge property losses and nothing could be salvaged from the camp. The flood waters left huge boulders in places on the flat.
Men were forced onto roofs to escape the floodwaters.
The estimated speed of the Kopuawhara Stream was 35 mph (56 km/hr).
Roads were washed out.
Thousands of sheep and cattle drowned. 3000 sheep were lost as a result of the flood.
1000 acres (405 ha) of pasture lands was submerged.
After destroying No.4 camp the torrents turned to No.2 camp (three miles downstream) where floodwaters raced through huts. There were no lives lost there.
The flood from the river continued its course through open country to the sea. It gradually lost its momentum, but devastated a wide area of pasture by its deposits of driftwood, debris and silt.
No.5 Camp escaped the full force of the storm. But the road between No.5 camp and the big tunnel was washed completely away in places.
Kopuawhara Stream had an estimated peak discharge of 34,000 cusecs (963 cumecs) with a catchment area of 15.54 sq miles (4025 km^2) compared to the normal discharge of 22 cusecs (0.6 cumecs).
Kopuawhara Stream caused considerable scour in the valley.
Maraekakaho recorded 3.75 in (9.53 cm) of rain.
Ngaroruru River overflowed and inundated a large area of land near Pakowai.
Ngaroruru River had a peak discharge of 70,000 cusecs (1982 cumecs) at Fernhill Bridge.
Napier recorded 2.36 in (5.99 cm) of rain in 24 hours.
Tarawera recorded 7.86 in (19.96 cm) of rain on the 19th.
Tarewa recorded 200 mm (20.0 cm) of rain in 24 hours (which has a return period of 10 years).
Whanawhana recorded 2.33 in (5.92 cm) of rain.
Eastern Wairarapa experienced a torrential downpour on the 19th causing flooding of stream and rivers in the area.
Miles of fences were flattened.
Stock losses were small. One settler lost 400 ewes.
Many bridges demolished or damaged.
The Tinui and Whakataki districts suffered most in the flood.
Flat Point recorded 2.73 in (6.93 cm) of rain in three hours.
Kaiwhata Stream rose 20 ft (6.01 m).
Ngahape Bridge was washed away.
Masterton recorded 1.32 in (3.35 cm) of rain in three hours.
No serious flooding occurred although the streets were awash at one period.
Tinui River rose at a rate of one foot (0.3 m) a minute.
Several houses were flooded.
Numerous flood gates were destroyed and miles of fencing was destroyed.