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Home » News » Archives for July 2013

Archives for July 2013

Coastal cliffs and high resolution photogrammetry

July 9, 2013 by Bill Cromer Leave a Comment

I am facilitating a PhD research project by the School of Geography and Environmental Studies funded by a local Council in southern Tasmania. The residential area is known for large-scale, slow-moving landslides but the extent and rate of recession of adjacent coastal cliffs is unclear.

The initial aim of the photogrammetry research is to get high definition imagery of a short section of cliff line using small unmanned aircraft, in particular where parts of the cliff are vegetated and parts unvegetated, to see if the method can effectively eliminate vegetation effects and so detect small scale changes to the whole cliff surface irrespective of vegetation cover. If successful, the approach could be extended further along the several kilometres of cliffs in the area, and further afield.

The first photogrammetry run will be in the next month or two.

Filed Under: Vulnerable Coasts and Sea Levels

Innovative domestic wastewater designs

July 5, 2013 by Bill Cromer 1 Comment

Recently, I became aware of the design work being done on Bottomless Sand Filters (BSFs) by a fellow wastewater designer – Richard Mason – here in southern Tasmania.

In 2004 I released a discussion and guidance paper for what I called Nonconventional Beds (NCBs) – above-ground, on-site, domestic-sized wastewater systems similar to Wisconsin Mounds.  The paper was aimed mainly at designers, installers and regulators of such systems in Tasmania, but it had broad, even universal application.

Nonconventional beds have now been installed in southern Tasmania without incident for more than a decade.

BSFs provide a high level of wastewater treatment in a relatively small area, and are best suited, like NCBs, to sites with limiting features like clay soils or high water tables.  Accordingly, I recommended BSFs systems for a small township with limiting soils and mainly small lots, which led to the need for a discussion and guidance paper for stakeholders. Richard kindly offered advice, plans and drawings, and Chris Lewis Plumbing, installer of such systems, was forthcoming with site photographs and further advice.

The result is Bottomless Sand Filters: Notes for designers, installers and regulators, released in July 2013 accompanied by an updated version of the 2004 NCB paper.  Subject to the requirements of local or national jurisdictions, the principles of wastewater management and the generic system designs described in them ought to be globally applicable.

Feel free to download copies of each. Feedback would be good.

Filed Under: Wastewater

Cromer Permeability App

July 4, 2013 by Bill Cromer Leave a Comment

An exciting and new development for me has been to work with app designers and Apple to release, in June 2013, my first app for iPad and iPhone.

The Permeability Calculator will be useful for engineers, soil scientists, irrigation designers and students – in industry, consultancies, government and universities. Several more apps are at the preliminary design stage.

Filed Under: Apps & Software

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