UMCSAWM Water Conference
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Articles are published as supplementary reading material demonstrating the strength of water engineering and management capability. The contents are designed and developed through case study applications.
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Browsing UMCSAWM Water Conference by Author "Dahanayake, AC"
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- item: Conference-Full-textPotential of Water Balance Modelling with Surface Water Pollution Considerations to Manage Ungauged Watersheds with an Emphasis on Multi User Concepts – Demonstrating an Application at a Watershed in Dampe, Sri LankaDahanayake, AC; Wijesekera, NTSPracticing integrated water resources management (IWRM) for sustainability is vital when there is multi user competition for the finite fresh water resources. In order to facilitate early decision making, it is necessary to evaluate ungauged small watersheds with simple, easy to apply but quantitative tools. This paper demonstrates the possibility of successfully applying the multiuser concept, the finite nature of water and system water balance, as a mean to overcome the surface water pollution in Dampe watershed (0.62km2), Sri Lanka. Since this watershed is ungauged, field visits, gauged data from the locality, estimates from available literature were used for a rational application of water balance to evaluate solutions for surface water pollution. The watershed runoff was calculated using a two parameter water balance model which enabled soil moisture accounting. The monthly water balance model for Dampe watershed which included multi sectoral water uses, the surface water quantity and quality at each key stream node for each sub catchment enabled the analysis of several scenarios. Remedial measures to overcome the problem and sustainable methods to preserve water for the future generation are proposed.
- item: Conference-Full-textSustainable Solutions for the Drying Up of Groundwater Wells – A Case Study in a Selected Watershed in Dampe, Sri LankaDahanayake, AC; Rajapakse, RLHLGroundwater has now become a limited resource due to the adverse impacts of various natural and anthropogenic causes. Due to the increasing population and rapid urbanization, the demand for groundwater has been ever in-creasing. Consequently, the occurrence of declining groundwater tables and drying up of wells have been reported in different parts of the country. In order to identify adverse impacts and facilitate early decision making, it is necessary to assess and evaluate ungauged small watersheds with simple, easy to apply but quantitative tools. This paper demonstrates the possibility of successfully applying a conceptual, lumped parameter rainfall-runoff model based on water balance approach (The ABCD model) in combination with a basic (Single Basin) HEC-HMS model to identify a comprehensive solution for the drying up of groundwater wells, for Dampe watershed (0.62km2), Sri Lanka. The model was used to carry out a quantitative analysis of groundwater storage and identify the interaction with land use pattern, and it was developed by using gathered and simulated usage and recharge data of the surface and groundwater basins. Several scenarios have been analysed using the ABCD model, in order to identify the ground-water depletion at the present condition, in the future condition (with 50% increase in the impervious area of the catchment) and the proposed solution scenario, which is to increase the pervious area of the catchment. The developed single basin HEC-HMS model has been used in order to determine the peak flow associated with a 10-year re-turn period storm event. Remedial measures to overcome the problem and sustainable methods to preserve water for the future generation are proposed based on the findings of the study.