The Clean Water Act of 1972 as amended in 1987 requires states to control the flow of pollution from storm water into local rivers. In most cases, this requirement is carried out through installation of an expensive system of pipes and pumps. The Tollgate Drainage District, Ingham County, Michigan, examined here, uses a more economical alternate approach: water from the district flows into an a...

in almost all of the present mathematical models, the upstream subbasins, with overland flow as the dominant type of flow, are simulated as a rectangular plane. however, the converging plane is the closest shape to an actual upstream subbasin. the intricate nature of the governing equations of the overland flow on a converging plane is the cause of prolonged absence of an analytical or semi ana...

By analysing the hydrographs of karst springs it is possible to identify aquifer characteristics and, accordingly, the main features of a karst rock-fissure massif. Consequently, relevant data can be obtained by analysing hydrograph recession curves. This paper presents a detailed analysis and explanation of numerous cases of break points on recession curves via various values of the recession ...

Debris flows caused by channel bed erosion present major hazards affecting life, livelihoods, and the built environment in mountainous regions. An efficient way to decrease hazard impact is through reliable forecasts appropriate early-warning strategies. Rainfall thresholds are fundamental achieving forecasts. However, a lack of rainfall records often impedes empirical establishment such thresh...

A continuous simulation rainfall-streamflow modelling approach that identifies unit hydrographs for total streamflow has been applied to an 11-year record from a national hydrometric monitoring network catchment in the UK. The model is of the parametrically parsimonious conceptual model (PPCM) type that can make efficient use of rainfall, streamflow and air temperature data readily available fr...

[1] The estimation of catchment-averaged aquifer hydraulic conductivity values is usually performed through a base flow recession analysis. Relationships between the first time derivatives of the base flow and the base flow values themselves, derived for small and large values of time, are used for this purpose. However, in the derivation of the short-time equations, an initially fully saturate...

A full-scale physical model of a modified infiltration trench was constructed to test a new storm water best management practice called an ecology ditch. The ditch was constructed using compost, sand, and gravel, and a perforated drain pipe. A series of 14 tests were conducted on the physical model. The tests controlled rainfall application and overland roadway runoff amounts and monitored outf...

To understand how hydrological processes are related across different spatial scales, 201 rainfall runoff events were examined in three nested catchments of the upper river Saalach in the Austrian Alps. The Saalach basin is a nested catchment covering different spatial scales, from the micro-scale (Limberg, 0.07 km2), to the small-catchment scale (Rammern, 15.5 km2), and the meso-scale (Viehhof...

Abstract. Knowledge of the variability hydrograph outflow from urban catchments is highly important for measurements and evaluation operation sewer networks. Currently, hydrodynamic models are most frequently used modeling. Since a large number their parameters have to be identified, there may problems at calibration stage. Hence, sensitivity analysis limit parameters. However, current analytic...

Abstract The paper considers the problem of inverse flood routing in reservoir operation strategy. aim work is to investigate possibility determining hydrograph at upstream end based on required downstream using simplified open channel flow models. To accomplish this, linear kinematic wave equation, diffusive equation and Muskingum are considered. achieve end, an solution afore mentioned equati...