ENV3105 Hydrology 2012 1 | P a g e Assignment 2 Due date: 19 October 2012 Weighting: 30% (300 marks) 1. Overview This assessment is designed to test your achievement of selected learning objectives of Modules 6 to 9. In particular, the assignment involves estimation of urban design discharges, reservoir routing and water balance. It is intended to reinforce and extend your knowledge on urban hydrology, using a residential subdivision located in Townsville as a case study. Document Preview: ENV3105 Hydrology 2012 1 | P a g e Assignment 2 Due date: 19 October 2012 Weighting: 30% (300 marks) 1. Overview This assessment is designed to test your achievement of selected learning objectives of Modules 6 to 9. In particular, the assignment involves estimation of urban design discharges, reservoir routing and water balance. It is intended to reinforce and extend your knowledge on urban hydrology, using a residential subdivision located in Townsville as a case study. The assignment is divided into three parts: ? Part A Estimation of Minor and Major design flows for an urban subdivision. ? Part B Analysis of a detention basin proposed for the subdivision. ? Part C Preliminary water balance analysis of a stormwater harvesting pond for the subdivision 2. Part A Minor and Major Design Discharges 2.1 Proposed Townsville residential subdivision A drainage scheme is to be designed for a 16 lot residential subdivision near Townsville, Queensland. Prreliminary layout plans can be downloaded from StudyDesk. The Minor system is to cater for the 2 year ARI storm and the Major system for the 100 year ARI storm. Topographic contours are shown on the plan. The flowpath arrows shown on the plan are indicative assume that there will be no overland flow across boundaries between individual lots. Pits will be based on Brisbane City Council standard drawings. Assume all pits will be kerb lip in line with the exception of field inlets at 1A, 2A and 1F. Initial design information at pit locations (as well as other locations) are given in Table 1. Table 1: Initial design details at pit locations Pit/Location Road level (m LD) Lots draining to pit 1A 53.2 1B 53.0 Lots 1, 2, 3, 4 1C 51.1 Lots 5,6,7 1D 50.4 Lots 8,9 1E 49.2 Lots 10,11 1F 48.0 2A 49.3 Lots 12, 13, 14, 15, 16 X 58.0 Y 51.8 Note: m LD = metres above local datum Your task is to prepare a Minor system design of the pits based on the preliminary layout and then a ENV3105 Hydrology 2012 2 | P a g e Major system Attachments: ENV3105Assign.pdf