Hydraulics

(3 Credit Hours) · Undergraduate

Hydraulics is a one semester module which provides students with the concepts of hydraulic engineering. The module reviews the relevant aspects of fluid flow developed in 2E5, such as Bernoulli's equation, and the momentum and continuity relationships and demonstrates how these are developed for use in Civil Engineering design. The module develops the concept of analysing time varying problems using quasi-steady state relationship and compares the results with some readily developed closed form solutions. The methods of developing head/discharge relationships for pipe flows which includes for friction loss are formulated. The principals involved in the flow of water in open channels are explained and relationships are developed to allow the estimation of the discharge in open channels and the depth variation behind control structures. The methods used to analyse pipe networks, with and without pumps within the system, are developed. The design of water distribution systems providing an adequate supply of water to consumers is also examined. Finally, the module examines the subject of Urban Drainage, initially comparing combined systems against separate systems. The calculation of hydraulic loads for the network is then demonstrated for both wastewater quantities and also storm water predictions from the analysis of rainfall events. The hydraulic design of the pipe network to these loads is then examined before moving onto the design of Combined Sewer Overflows which are used to relieve the system hydraulically under storm conditions. IR - Dublin, Ireland This module builds on the Stage 2 Hydraulics I (CVEN20130) module in which foundation material relating to fluid definitions, properties, application of the fundamental fluid principles (continuity, energy and momentum) were presented for steady flow closed conduit and open channel hydraulic systems. It is essential that this material is fully understood and retained at the commencement of the Hydraulics II module. The module itself will take place in the Spring trimester and will consist of 36 lectures (3 per week), 2 laboratory exercises, 4 tutorials, 2 in-class tests and an end of trimester examination. The course is broadly split between closed conduit (pipe) and open channel (rivers and streams) flow and will also present the principles of physical similarity in hydraulic systems in which experimental results from small scale models are applied to other conditions. The closed conduit analysis in this module develops the theory presented in Hydraulics I for single pipe systems to parallel and series systems and also to more complex branched and loop-type pipe networks. Energy is lost through friction and local losses in pipe systems but mechanical energy through hydrodynamic machines can overcome these losses. Hydrodynamic machinery (pumps) are investigated for a full range of pipe systems. The open channel flow component of Hydraulics I studied steady-uniform flow conditions in simple channels. The open channel flow component of Hydraulics II builds on this to include non-uniform flows that are both gradually and rapidly varied. Energy and momentum principles are applied in this analysis and the 'special' case of hydraulic jumps are analysed. Water surface GVF profiling using direct and standard step methods is presented and this OCF analysis is extended to river modelling (HEC-RAS). More complex compound channel geometries where floodplains are inundated present different challenges for engineers and these are presented and analysed. The concept of suntainability features throughout the module. The relationship of the module content to the UN SDGs is presented at the outset of the course and as students work through the the different course components, the relevence of that material to SDGs (particularly, SDG 6, 9, 11 and 14) is outlined.