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Evidence Guide: NWP510A - Develop and maintain ratings

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

NWP510A - Develop and maintain ratings

What evidence can you provide to prove your understanding of each of the following citeria?

Review individual measurements.

  1. Identify purposes of ratings.
  2. Review measurements and compare against expected trends.
  3. Use standard processes and software to check, edit and verify field data.
  4. Correct and adjust inconsistent data.
Identify purposes of ratings.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Review measurements and compare against expected trends.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use standard processes and software to check, edit and verify field data.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Correct and adjust inconsistent data.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Develop rating curves.

  1. Analyse existing measurements to establish trends and compare with existing ratings.
  2. Identify sources of error in ratings.
  3. Prepare rating curves based on measurements and agreed formulae and mathematical techniques under a variety of hydraulic conditions and control types.
  4. Confirm and verify existing trend or define new trend.
  5. Develop rating curves which comply with industry and client requirements.
  6. Use theoretical methods to create or extend ratings.
  7. Document processes and observations to provide traceability and accountability for quality assurance.
  8. standard formulas to create ratings for pre-calibrated measuring structures.
  9. Apply quality codes to rating curves.
Analyse existing measurements to establish trends and compare with existing ratings.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Identify sources of error in ratings.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare rating curves based on measurements and agreed formulae and mathematical techniques under a variety of hydraulic conditions and control types.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Confirm and verify existing trend or define new trend.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Develop rating curves which comply with industry and client requirements.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Use theoretical methods to create or extend ratings.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Document processes and observations to provide traceability and accountability for quality assurance.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

standard formulas to create ratings for pre-calibrated measuring structures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apply quality codes to rating curves.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Maintain rating curves.

  1. Confirm accuracy of rating curves using recent measurements and review trends and rating applicability.
  2. Develop rating curves based on new information from reviews and changed conditions.
  3. Retrieve and analyse current, historic and trend data using appropriate mathematical techniques and in accordance with organisational procedures.
  4. Document processes and observations and adjustments made.
Confirm accuracy of rating curves using recent measurements and review trends and rating applicability.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Develop rating curves based on new information from reviews and changed conditions.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Retrieve and analyse current, historic and trend data using appropriate mathematical techniques and in accordance with organisational procedures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Document processes and observations and adjustments made.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Report rating curves.

  1. Check rating curves covers full stage range.
  2. Prepare and store required archival data according to organisational procedures for data security.
  3. Prepare and disseminate ratings in accordance with client requirements.
  4. Make recommendations for future observations.
Check rating curves covers full stage range.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare and store required archival data according to organisational procedures for data security.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Prepare and disseminate ratings in accordance with client requirements.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Make recommendations for future observations.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.

Critical aspects for assessment and evidence required to demonstrate competency in this unit

The candidate should demonstrate the ability to establish relationships between variables such as stage versus flow and conductivity versus salinity including:

gathering and interpreting complex documentation and applying it to the development and maintenance of rating curves

analysing and verifying data using standard procedures, software and databases

preparing clear and accurate reports

storing and archiving data

identifying, reporting and providing solutions to a range of flow conditions

Context of and specific resources for assessment

Access to the workplace and resources including:

documentation that should normally be available in a water industry organisation

workplace specific equipment and technology

supervision and experienced team members to provide observations, feedback and third party reports

enterprise operating procedures and work allocation

relevant codes, standards, and government regulations

Where applicable, physical resources should include equipment modified for people with disabilities.

Access must be provided to appropriate learning and/or assessment support when required.

Assessment processes and techniques must be culturally appropriate, and appropriate to the language and literacy capacity of the candidate and the work being performed.

Validity and sufficiency of evidence requires that:

competency will need to be demonstrated over a period of time reflecting the scope of the role and the practical requirements of the workplace

where the assessment is part of a structured learning experience the evidence collected must relate to a number of performances assessed at different points in time and separated by further learning and practice

a decision of competence should only be made when the assessor has complete confidence in the person's competence over time and in various contexts

all assessment that is part of a structured learning experience must include a combination of direct, indirect and supplementary evidence

where assessment is for the purpose of recognition (RCC/RPL), the evidence provided will need to be authenticated and show that it represents competency demonstrated over a period of time

assessment can be through simulated project-based activity and must include evidence relating to each of the elements in this unit

In all cases where practical assessment is used it will be combined with targeted questioning to assess the underpinning knowledge. Questioning will be undertaken in a manner appropriate to the skill levels of the operator, any cultural issues that may affect responses to the questions, and reflecting the requirements of the competency and the work being performed.

Required Skills and Knowledge

Required skills:

collect and analyse data

apply mathematical modelling and analytical tools

interpret and apply technical documentation to the collection, analysis and reporting of hydrometric data

identify and address potential or actual operational problems

record information and prepare reports and interpret a range of organisational documents

use computer systems and use various computer programs&spreadsheets to create ratings

use remote work communication systems

check hydrometric data for correctness and accuracy in preparation for creating ratings

identify characteristics of ratings appropriate to various cross section types&flow

regimes

identify incorrect and impossible ratings

adjust gaugings, hydrograph trace and ratings to a common datum

create ratings manually using various methods

create ratings for standard measuring structures

develop rating techniques to handle seasonal rating changes

identify the possibilities and limitations of scale models for generating ratings

identify and recognise causes of progressive, cyclical and sudden rating changes

identify backwater-affected stations and use appropriate techniques to rate them

identify gradual stream changes and adopt appropriate rating techniques

identify short-term rating changes, their causes and means of correctly processing them

apply Student's T test to determine whether a new rating is required

draw an accurate rating by hand

fit a rating curve using a number of mathematical techniques available in HYDSYS HYRATED

identify the probable error of a rating, and understand its significance

identify gross errors in ratings and the data used to compile them

apply appropriate quality codes to a rating

identify the elements of a stream bed&channel that affect ratings

estimate channel roughness from photographs

calculate the overall roughness coefficient of a channel consisting of a number of elements

use graphical logarithmic methods to extend a rating

identify appropriate sections to use for slope-area flow calculations

manually calculate flow rates using a set of cross sections and a long section

use a spreadsheet to perform calculations

make correct measurements and calculate flow rates through and over various structures

Required knowledge:

mathematical and other scientific techniques relevant to the analysis of hydrometric data

Student's T test

the elements of a stream bed&channel that affect the rating

the relationship between Chezy&Manning roughness coefficients

computer software relevant to the analysis and archiving of hydrographic data

the basis of statistical goodness of fit tests

occupational health and safety procedures

policies and standard operating procedures

Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.

Standard processes and software may include:

standards relevant to preparation of rating

procedures for the development, maintenance and extension of rating curves

computation of flow from stage data and rating curves

software (Kisters - Hydstra, Scientific Software Group - AquaChem, Microsoft - Excel)

web-based development tools for presentation and reporting of data

Mathematical techniques may include:

logarithmic transformation

conversion of units

graphical analysis

gauging calculations

calculation of sediment load, sediment yield and sediment deposition

A variety of hydraulic conditions may include:

rapidly rising and falling stages

tail water and backwater affected

tidal effects

transitional from calibrated to channel

control sensitivity

siltation & control changes

Control Types may include:

sectional controls

partial controls

channel controls

Theoretical methods may include:

Mannings

Chezy

A(D

HECRAS

Archival data may include:

archive structure

period of applicability

rating equations