Lake NgarotoPast and Present

Where

History

Cadastral Map dated late 1800’s early 1900’s

Ngaroto in the 1960’s

Lake Outlet

Lake Ngaroto Water Level Monitoring from 2003 - 2010

33.800

34.000

34.200

34.400

34.600

34.800

35.000

35.2001-Jan

1-Feb

1-Mar

1-Apr

1-May

1-Jun

1-Jul

1-Aug

1-Sep

1-Oct

1-Nov

1-Dec

Wat

er L

evel

(m

) R

L M

otu

riki

Dat

um

Lake Ngaroto 1980s

Lake Ngaroto at 2007

Lake Ngaroto: Water Quality Monitoring

Parameters Measured • Water temperature • Dissolved Oxygen• Algae in the water column • Rainfall

Lake Ngaroto: Council / Community Goals

1. Retain and enhance the recreational opportunities– Access to and around the lake– Maintain or increase lake depth– Improve water quality

2. Retain and restore indigenous biodiversity– Control mammalian pests and introduced weeds– Adopt a more natural water level management regime that

will improve marginal habitats3. Preserving and promoting the history associated with the Lake

and it catchment– Protecting the on site features and artefacts– Providing quality Interpretation

Actions Taken and Proposed

1. Repair the circuit track and board walk / bridges2. Control willows to encourage more favourable indigenous

species to colonise the margins (treatment started within southern sector)

3. Replace collapsing manuka stand with more suitable species4. Ramp up the control of aggressive weeds5. Complete the application to renew the resource consent to

operate the weir on the lake outlet

Actions Proposed1. Control pest fish – koi, bullhead catfish, rudd and goldfish2. Control mammalian pests – possums, cats, ferrets, stoats and rats3. Acquire those areas of private land that are inundated when lake

levels rise – approx. 22ha4. Re-route inflows from Ngaroto-iti to lake outlet5. Interpret the swamp Pa and other significant features around the

lake 6. Improve the Domain – infill / consolidate the low lying area; retain

the lake edge in front of the Domain to prevent erosion ; reinstate the boat ramp by the rowing sheds

7. Reduce inflow of nutrients to the lake by assisting landowners to change / modify farm management practises