Overland flow certification guidelines

1. Introduction and process overview

1.1 Purpose and scope of these guidelines

1.2 What is certification and when is it required?

1.2.1 What is certification?

1.2.2 When is certification required?

1.3 Certification process

1.3.1 Pre-certification planning – stage 1

1.3.2 Undertaking certification – stage 2

1.3.3 Lodgment, assessment and decision making – stage 3

1.4 Important background information

1.5 Qualifications

2. Measurement and calculations

2.1 Determining storage volumes

2.2 Works excluded from certifications

2.3 Methodology for determining volume

2.3.1 Class A storages – simple estimation method

2.3.2 Class B storages – design plan method

2.3.3 Class C storages – simple survey method

2.3.4 Class D storages – detailed survey method

2.4 Determining dam crest level (RL) – all storages

2.5 Determining freeboard – all storages

2.6 Identifying point of capture

2.7 Location of control point

2.8 Storage data required for certification report

2.8.1 Class A storages

2.8.2 Class B storages

2.8.3 Class C storages

2.8.4 Class D storages

3. Determining the rate of take

3.1 What is rate of take?

3.2 Condition of works (rate of flow) assumptions

3.3 Maximum rate of take – limited versus unlimited

3.4 Rate of take limited maximum

3.5 Rate of take – unlimited

3.6 Flow conditions

4. Average annual diversion

4.1 Choice of hydrological model

4.1.1 Overland flow only versus conjunctive works

4.1.2 Comparative versus quantitative modelling

4.2 Determining components (inputs) for the hydrological model

4.2.1 Water source: Local catchment runoff

4.2.2 Water source: floodwater flows

4.2.3 Other water sources

4.2.4 Water demand

4.2.5 Losses

5. Recommendations about control and measurement

5.1 Type and location

6. Proposed entitlement specification and conditions

7. Glossary

8. References