April 30, 2023
what are permeable walls for structural design to New Zealand standards for wind calcs
I researched various sources, including Reddit discussions, building biology institute articles, and technical guides on structural design for wind calculations in New Zealand. Most of the sources discussed topics related to stormwater management, permeable pavers, and wind load calculations, but none directly addressed permeable walls for structural design to New Zealand standards for wind calculations. Therefore, my findings are limited and uncertain in terms of directly answering the query.
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Permeable Pavers in Stormwater Management
In a Reddit discussion, a user was trying to design permeable pavers for a site where an infiltration basin was not feasible due to new New Jersey DEP rules. They were unsure if they needed to treat the drainage area from the existing parking lot for water quality with the proposed pavers to receive credit or just need to treat the proposed pavers and new asphalt to receive water quality credit. A commenter suggested that if the existing adjacent pavement area doesn’t drain to the proposed permeable pavers, the user wouldn't have to make any accommodation for additional water quality control. The user eventually redesigned the project to use catch basins for water collection and treatment.
Breathable Walls and Moisture Control
A building biology institute article discussed the concept of breathable walls, which are building envelopes that allow for the unobstructed flow of vapor molecules. The article also mentioned that bulk or liquid water can cause the most damage to building materials and contents. However, no specific information related to structural design in New Zealand was provided.
Wind Load Calculation for Structures in New Zealand
Wind load calculation for structures in New Zealand can be found in the AS/NZS 1170.2 standard. The standard provides a formula for determining the design wind pressure and information on regional wind speed. The site location's terrain and height should also be considered when calculating wind load. SkyCiv offers a Load Generator tool that helps calculate design wind speed and pressures for site locations in Australia and New Zealand. The tool generates pressure and result figures using defined parameters. However, there is no mention of permeable walls in these sources.
In conclusion, the research provides information on stormwater management, breathable walls, and wind load calculations in New Zealand but does not directly address permeable walls for structural design to New Zealand standards for wind calculations.
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Research
Source: "National Party’s “Stop Three Waters” sign meets..." (from reddit, r/newzealand)
- User query: “what are permeable walls for structural design to New Zealand standards for wind calcs”
- No relevant information related to the query can be found on the webpage.
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The comments under the post discuss the recent flooding in Auckland due to a failed stormwater system.
- Stormwater infrastructure in NZ is chronically underfunded and houses are still being built in places they shouldn’t.
- The rain event was over a 250 year event with 2100 climate from what a stormwater engineer can see on the rain gauges.
- Flood design/assessment in NZ is up to a 100 yr with 2100 climate.
- A house was built in the edge of a stream in Wellington.
- Pipes in Auckland are designed for a 1 in 5 year event.
- 100 year event scale is constantly reassessed and it becomes quite hard to communicate the level of service to the community.
- Climate models suggest much more likely rain events in the future.
Source: "AS/NZS 1170.2 (2021) Wind Load Calculations - S..." (from web, skyciv.com)
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Website: AS/NZS 1170.2 (2021) Wind Load Calculations
- Provides information on how to calculate wind load pressures for a structure.
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Includes SkyCiv Load Generator to help calculate design wind speed and pressures using interactive Google Map.
- Calculates Basic Wind Speed, Average Recurrence Interval (ARI) and Importance Level that govern the type of structure and its potential impact.
- Pulls Serviceability Limit State (SLS) and Ultimate Limit State (ULS) wind speeds for both Australia and New Zealand.
- Defines Wind Direction and Terrain Category parameters to calculate wind load pressures.
- Uses wall condition and action combination case parameters to calculate wind load coefficients.
- Generates pressure and result figures.
- Offers detailed wind load calculations that are only available for Professional Account users and those who purchased the standalone Load Generator module.
- Provides additional resources for Wind Load Calculation examples and Wind Speed Map by Zip Code.
- None
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Source: "Permeable Concrete Paving NZ | Concrete & Pavem..." (from web, bydesignconcrete.co.nz)
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Source: "Permeable Walls & Moisture Control Factsheet" (from web, buildingbiologyinstitute.org)
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Source: "Permeable Paver design" (from reddit, r/civilengineering)
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The webpage is about stormwater management designs under new New Jersey DEP rules.
- The three big criteria for water management are water quality, water quantity, and groundwater recharge.
- The web author is working on a site where designing an infiltration basin is not feasible.
- They are trying to design permeable pavers instead and have run into some hurdles.
- The new impervious area for the project is half an acre, and the site is already largely (>60%) paved, so they plan to install permeable pavers for the parking spaces for the new office building and keep the drive aisle asphalt.
- However, they are unsure if they need to treat the drainage area from the existing parking lot for water quality with the proposed pavers to receive credit or just need to treat the proposed pavers and new asphalt to receive water quality credit.
- There is a statement in the code that says the additional drainage area to the pavers can be 3x the surface area of the pavers.
- A reddit user comments that if the existing adjacent pavement area doesn’t drain to the proposed permeable pavers, the web author wouldn’t have to make any accommodation for additional water quality control.
- The web author later finds that permeable pavers won’t be efficient to use, so they redesign the project to use two catch basins to collect and store the water, which will go to an outlet structure and be treated by a manufactured treatment device to about 50 TSS before being discharged downstream.
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