Lake Okareka

Lake Okareka is a shallow lake that stratifies for approximately six months of each year. It has the second highest density of human habitation, increasing during summer months. Lake Okareka is linked to Lake Tarawera via the Waitangi Spring. There are few problems with the lake, however during periods of deoxygenation of the bottom waters nutrients are released from the sediments. The quality of the lake is poorer than the baseline quality requirements of EBOP’s regional plan (EBOP, 2000).

Catchment Information:

The following data is from the Environment Bay of Plenty Lake Okareka Catchment Management Action Plan.

Land Cover Area (ha) Area (%) Bare ground Forest indigenous Forest planted Pasture Scrub mixed Urban TOTAL 8 513 93 839 125 45 1624 0.5 31.6 5.8 51.6 7.7 2.8 100

Farming type Area (ha) Area (%) Sheep and beef Sheep Beef Deer Other TOTAL 691 15 83 32 16 839 42.6 0.9 5.1 2.0 1.0 51.6

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Available data:

Site	Year	Data description
Site 1	1987 - 2002 1990 - 2002	profiles, station depth water quality, lake height, secchi depth
Site 2	1994 ,1995	station depth, secchi depth, profiles, water quality
Site 10	1980 - 1999	Secchi depth
data data - DYRESM format

Site	Year	Data description
Site RP1	1981, 1982	profiles, chlorophyll a, secchi depth
Site ROKN	1992 - 1996	profiles
Site ROKS	1992	profiles
Site ROKC	1992 - 1996	profiles
data

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Link to Meteorological data
Link to Ocean View data

Ocean View plots

Data Table

Site 1
Site 2
Site 10
Sites RP1, ROKN, ROKC, ROKS

Year	81	82	83	84	85	86	87	88	89	90	91	92	93	94	95	96	97	98	99	00	01	02	03	04
Water Quality Data
TN
NO3
NH4
TKN
TP
DRP
Secchi depth
Chlorophyll a
Turbidity
pH
Physical Properties
Lake height
Temperature and DO profiles