Advice on the selection of rainfall events for verification purposes

Advice on the choice of tide levels to use where overflows are tidally influenced. Also discusses joint probability of tide levels and rainfall.

Describes issues on the use of data from weather radar in sewer models

Description of the PR equation. Also referred to as the Wallingford runoff model.

This User Note gives guidance on the collection of sub-catchment area data for use with the Wallingford Runoff Model.

Description of the ‘New UK Runoff model’

Advice on estimating the components of dry weather flow and its diurnal variation

Describes a methodology to actively control the release of trade effluents into sewer systems so as to smooth out the flows/loads arriving at WwTWs.

Describes vortex flow control devices and how to model them – in general and in different software packages.

Describes the principles behind modelling different types of throttles and gives advice on selecting coefficients.

Provides a method to calculate an allow for unmodelled storage

Advice on discharge coefficients for different types of overflow – both weir and orifice. Also allowances for scrum boards and screens.

Discusses the alternative ways in which detention tanks can be modelled. Also issues about storm durations, emptying and sedimentation.

When a verified hydraulic model predicts flooding careful assessment is required to determine its effect.

Finham Sewage Treatment Works (STW), which servers the Coventry urban drainage catchment, is to undergo a major capital scheme to meet a number of requirements.

As the UK Water Industry has gained more experience in the use of hydraulic models of sewerage systems there has also come a tendency to expect more and better performance from these models with a general expectation by non-practitioners that the models will always give the correct results no matter what is asked of them.

Describes the problems with earlier models of assigning runoff parameters when the model covers both combined and separate systems. Advice on adjustments to runoff parameters when converting models.

Advice on good practice when verifying models

This User Note provides guidance on hydraulic modelling in urban areas using the latest versions of software which have the capability to model overland flows in 2 dimensions (2D).

General description of dynamic modelling of WwTW

This user note describes the factors that need to be considered when assessing the potential for Real Time Control (RTC).