Practical, plain-language guidance on choosing, installing and maintaining water storage, written by the Promax team.
Septic planning is often left until late in a build, and that costs time and money. Here's what NZ homeowners and builders should weigh up before choosing a system: sizing, site conditions, and council requirements.
Read the guideConcrete and asphalt stop water soaking into the ground, which drives runoff, cuts groundwater recharge and carries pollutants into waterways. Dual purpose tanks tackle it by doing detention and retention in one tank, which also satisfies SMAF controls.
Read the guideGround movement is not only an earthquake problem. In Auckland, where seismic activity is low but the clay is highly expansive, the soil moves with every wet and dry cycle. What that means for leak risk, B2 durability, liability and repair in integrated water systems.
Read the guideCouncil stormwater rules differ from region to region, so the tank you need depends on which rule applies to your site. Promax detention tanks and sizing calculators take the guesswork out of the number.
Read the guideClause B2 of the New Zealand Building Code sets durability standards for building elements, and B2/AS1 is the acceptable solution beneath it. Here is what it covers and how compliance is demonstrated.
Read the guideRoof to tank, tank to pump, pump to changeover device: how a rainwater reuse system is plumbed, the backflow prevention it needs, and what a council wants documented.
Read the guideTP108 sets out how stormwater mitigation is calculated and managed. What the guideline covers, and how Promax calculators based on it size detention and retention tanks.
Read the guideOnly the council in your region can tell you whether your tank needs building or resource consent. Rules differ from district to district and change often, so make the council your first call.
Read the guideSMAF, or Stormwater Management Area Flow, is a component of the Auckland Unitary Plan that splits stormwater management into SMAF 1 and SMAF 2 areas. This is an orientation to what the framework covers.
Read the guideMBIE determined that a stormwater tank near a property boundary is not required to comply with Building Code clauses C3.6 and C3.7. Here is what the determination says, and the council planning rules it does not override.
Read the guideBrowse Promax tank categories for residential, rural, commercial, and specialised applications.
Durable above-ground water tanks for rural, residential, and commercial storage.
Underground water storage for sites where space, access, or visibility matters.
Narrow-profile tanks designed for homes, boundaries, and other restricted spaces.
Specialised tanks for demanding commercial, industrial, and process applications.
