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Introduction

The purpose of Trench

Building a report

Using the Rank Option pages

Information

Flow chart for site assessment

Expected Design Area

Density of disposal systems in an area

Slope

Wastewater volume

Wastewater quality

SAR (Sodium Adsorption Ratio)

ESP (Exchangeable Sodium Percentage)

SAR, wastewater quality and soil dispersion

Scientific notation (expressing results in...)

Rainfall (what monthly figures do I use?)

ET (Evapotranspiration; Forestry Tasmania)

Water balance model

Daily water balance model

Landslips (classification of risk of instability)

Wetted area (climatic limitations)

Volume of overflowed wastewater

Wetted area (adjusting for cobbles and boulders)

Working with the nutrient models

Soil

Soil profiles and horizons

Soil texture plasticity and structure

Textural names

Plasticity

Soil structure

Soil tests

Consistency and relative density and bulk density

USCS soil classification

Agricultural soil classification

Soil categories based on texture

Soil dispersion

Modified Emerson dispersion test

CEC Cation Exchange Capacity

PAC Phosphorus Adsorption Capacity

Permeability defined with diagrams

Indicative permeabilities in the sand-silt-clay

Field permeameter

Permeability equations for field determination

LTAR Long Term Acceptance Rate

Groundwater

Water table depth to minimum depth to

Water bores radius of influence

Water bores close to disposal sites

Environmental values of groundwater

Estimating risk in relation to water bores

Working with the groundwater models

The viral dieoff model background equations

Cross-section for groundwater model 1

Cross-section for groundwater model 2

Cross-section for groundwater model 3

Cross-section for water bore model

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