| The Sizing of Rainwater Stores
Using Behavioural ModelsAlan
Fewkes, D Butler Department of Building and Environmental Health The Nottingham Trent University Burton Street, Nottingham, NG1 4BU, UK E-mail: alan.fewkes@ntu.ac.uk
Abstract The collection of rainwater from roofs, its storage and subsequent use is a simple method of reducing the demand on both the public water supplies and waste treatment facilities. The capacity of the rainwater store is important because it affects both system and installation costs. The rainwater store can be sized using one of three general types of model, namely, Critical period methods, Moran related methods and Behavioural models. This paper concentrates upon the use of behavioural models for the sizing of rainwater stores. Behavioural models simulate the operation of a reservoir with respect to time. The operation will usually be simulated over a given period of time using a time step of a minute, hour or month. The operation of the store is simulated using either a yield after spillage (YAS) or yield before spillage (YBS) algorithm. This paper evaluates the accuracy of behavioural models using different time steps and different sizing algorithms applied to both large and small stores. |
