WATER UTILITIES PRESENTATION FOR FWP HEARING MEETING 03 November - - PowerPoint PPT Presentation

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Sep 14, 2023 122 likes •277 views

WATER UTILITIES PRESENTATION FOR FWP HEARING MEETING 03 November 2016 The Current Problem Gisborne City Wastewater Property Issues Robert from Kaiti (1:28 min) https://www.youtube.com/watch?v=YMBwfw7pz-0 Di from Mangapapa (2:10 min)

SLIDE 1

WATER UTILITIES PRESENTATION FOR FWP HEARING MEETING – 03 November 2016

SLIDE 2

The Current Problem

SLIDE 3

Robert from Kaiti (1:28 min) https://www.youtube.com/watch?v=YMBwfw7pz-0 Di from Mangapapa (2:10 min) https://www.youtube.com/watch?v=09_s5wDKUrw Stormwater Ponding Kaiti (1:50 min) https://www.youtube.com/watch?v=njGuyjw1BZo&f eature=youtu.be

Gisborne City Wastewater – Property Issues

SLIDE 4

Gisborne City Overflow Points (49)

1992 – Lots of

uncontrolled

verflows in operation

2016 – All known

verflows are now

controlled

1998 – All known

cross connections removed/blocked

2000 – All known

Pump Stn overflows removed/blocked

2008 – Further

checking undertaken

2015/16 – Audit of

all Pump Stn

verflows

SLIDE 5

Wastewater Discharges- Event History (24-36hrs)

Reporting Year Frequency of discharges 2015/16 1 2014/15 1 2013/14 4 2012/13 3 2011/12 4 2010/11 3 2009/10 4 2008/09 2 2007/08 2 Prior to 2006/07 unknown

SLIDE 6

DrainWise Project - Background

video: http://youtu.be/pq5cG1YFciA Water Ponding Areas (RoG)

SLIDE 7

DrainWise Project - Background

HIGH (GROSS)

Gully trap faults,
Gully overtopping from

ponding

illegal connections,

HIGH (GROSS)

High Impact

Flood waters flowing over and into private gully traps
Water getting into leaking private gully traps
Roof water being piped straight into private gully

traps or private lateral wastewater pipes

SLIDE 8

DrainWise Project – The needle in the haystack

SLIDE 9

Budget 2015/25

Overall 2015/25 (10 yrs) Total Budget (Current) 26,621,873 Wastewater (WW) 19,626,770 WW - Renewals (Retic) 12,500,000 WW - Upgrades (Retic) 4,250,000 Inflow & Infiltration Inspections/Modelling 2,566,070 WW - Private Property Investigations 310,700 Stormwater (SW) 6,995,103 SW - Renewals 3,208,200 SW - Upgrades 3,197,673 SW - Model 310,700 SW - Private Property Investigations 267,500 SW - Secondary Flowpaths 11,030

In the Long Term Plan 2015/25 Council has allocated $26.6M

ver the 10 years.

The budget does not cover any private property improvements, it was assumes that the property

wner would be responsible for

this

SLIDE 10

Gisborne City Wastewater – Gully Traps

SLIDE 11

Gisborne City Wastewater – Gully Traps

SLIDE 12

1. Reduction of wastewater discharged into rivers and

streams during heavy rain to an average of only

nce every two years by 2026/27
2. Reduction of wastewater discharged onto private

property during heavy rain to an average of only

nce every two years by 2026/27

Comment: This equates to a 50% AEP rain event targeting 10% AEP

DrainWise Project – Our Targets

SLIDE 13

Wastewater Modeling Results

SLIDE 14

Wastewater Modeling Results

Pipe improvements

SLIDE 15

End of Presentation –

Questions

Di from Mangapapa (2:10 min) https://www.youtube.com/watch?v=09_s5wDKUrw Robert from Kaiti (1:28 min) https://www.youtube.com/watch?v=YMBwfw7pz-0 Stormwater Ponding Kaiti (1:50 min) https://www.youtube.com/watch?v=njGuyjw1BZo&feature=youtu.be Illegal: Stormwater downpipes going to Gully Trap (2:02 min) https://www.youtube.com/watch?v=SoMPfnFGTko&feature=youtu.be Panapa from Kaiti (3:00 min) https://www.youtube.com/watch?v=w8nEKBqR-mM&feature=youtu.be Smoke testing (2:28 min) https://www.youtube.com/watch?v=gJzgBFIReVs&feature=youtu.be