A conceptual model is used to calculate the weekly and monthly runoff for about 400 ungauged catchments in the southernpart of Sweden. To improve the performance of the model, a relationship is sought between model parameters and catchment characteristics. In a special study, 11 basins with a mixed geology and land use but with a low lake percentage are investigated. They are all in an area tha...

Urbanization leads to the replacement of natural areas by impervious surfaces and affects the catchment hydrological cycle with adverse environmental impacts. Low impact development tools (LID) that mimic hydrological processes of natural areas have been developed and applied to mitigate these impacts. Hydrological simulations are one possibility to evaluate the LID performance but the associat...

The surface water is a reflection of the climatic and topographical conditions basin in study area, affects estimation amount runoff on inside basin. It also possible to measure running know periods increase, scarcity this quantity, other hand, take advantage from for all fields uses. Qalachwalan one basins located at north city Sulaymaniyah with an area (876.1) km2, its sources are within bord...

Water quality impacts due to non-point source pollution can be significant particularly in environmentally sensitive areas. They may, however, be difficult to quantify, since the magnitude is heavily influenced by climatic, geomorphologic, lithologic and pedologic characteristics. A conceptual model for continuous daily simulation is proposed to reproduce the quali-quantitative response of a Si...

In this study, a simple travel time-based runoff model was proposed to simulate a runoff hydrograph on soil surfaces with different microtopographies. Three main parameters, i.e., rainfall intensity (I), mean flow velocity (vm) and ponding time of depression (tp), were inputted into this model. The soil surface was divided into numerous grid cells, and the flow length of each grid cell (li) was...

Abstract Displacement monitoring method of reservoir dam is a key research topic at present. In order to better display the overall efficiency horizontal displacement and vertical monitoring, numerical simulation analysis ecological small based on maximum entropy algorithm proposed. The virtual value calculated by algorithm, probability distribution function random variables obtained. comprehen...