Proposed District Plan Chapter 25.13 - Three Waters Rule 25.13.4.5a Water Efficiency Measures Reconvened Hearing 6 November 2014
Presentation Outline 1. Background 2. Submissions 3. Key findings from assessment of water reuse systems 4. Conclusions 5. Recommendation 6. Water efficiency measures retained in the Plan
Background • Hearing of Ch25.13 held on 6 November 2013 • Decision on Rule 25.13.4.5a deferred • HCC engaged Wainui Consulting Ltd to assess water reuse for residential dwellings in Hamilton
Summary of Submissions Plan Section Topic Submissions Further Submissions Number Number Number Number of Points of Points Rule 25.13.4.5a Water Efficiency 11 11 2 2 Measures
Scope of Submissions Relief Sought Number of Submissions Further Submissions Make rainwater & grey-water reuse mandatory 1 Retain requirements with amendments 3 Reduce or delete requirements 1 1 Delete requirements 6 1 Total 11 2
Key Findings from the Assessment of Rainwater Reuse Systems • No financial return directly to residents who invest in reuse systems • Rainwater reuse systems used solely for reducing potable water consumption are uneconomic • Tanks will be empty during droughts, so will not significantly reduce peak water demand
Key Findings from the Assessment of Grey-water Reuse Systems • No financial return directly to residents who invest in grey-water reuse systems • Ministry of Health: Does not support grey- water reuse in homes because of health risks
Conclusions • Retaining the part of Rule 25.13.4.5a relating to water supply and wastewater would be inequitable and unfair • Requiring rain water or grey water reuse systems is not an efficient or effective method to achieve the objectives of the plan • This part of the rule should be deleted
Recommendation • The changes within the Track Changed Version of Rule 25.13.4.5a of the Proposed District Plan be accepted
Rainwater and grey-water reuse systems • Remain in definition of “water sensitive techniques” (Vol 2, s1.1.2) • Could be required by a Water Impact Assessment or Integrated Catchment Management Plan where justified • Rain tanks are possible water sensitive technique for stormwater (25.13.4.5a)
Other Water Efficiency Provisions retained in Plan Low flow fixtures will be required in: • New residential units (25.13.4.5a) • Other new buildings containing a kitchen, laundry or bathroom (25.13.4.5a) • Alterations or additions to any existing building that add an extra toilet, kitchen, laundry or bathroom (25.13.4.5c)
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