Free download, software on soil salinity irrigation, drainage (original) (raw)
| RainOff | This helps in hydrologic modelling of effective rainfall, recharge, and water storage. It calculates runoff, surface drainage and discharge relations in hydrological catchment areas (watersheds) using the concept of a nonlinear reservoir. It contains a calculator for agricultural drainage systems with pipes and ditches. |
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| NashMod | The NashModel, like RainOff, calculates surface runoff and stream flow from rainfall. However, instead of a non-linear reservoir it uses a cascade of linear reservoirs, an idea elaborated by Nash. In some cases it yields better results than RainOff, but in other cases absolutely not. The model was developed recently and put on this website on 17 August 2017. |
| FloodRoute | This hydraulic model does calculations on flood wave transport in a river or channel section. The model is based on the concept of a non-linear reservoir having an outflow function with two parameters. Given the inflow and outflow waves the parameters will be given an optimal value securing the best fit of the observed and similated (calculated) outflow wave. Once the parameters are well established, they can be used to predict the outflow wave for any conceived inflow wave. |
| EnDrain | This hydrologic model does calculations on steady-state discharge by horizontal subsurface drainage systems, hydraulic head, as well as depth and level of water-table in agricultural land. It comes up with a drain spacing using the energy balance of groundwater flow, but also the Darcy and continuity equation (mass balance/budget of water). It includes drain entrance resistance and soil anisotropy of hydraulic conductivity (soil permeability for water), i.e. the horizontal and vertical hydraulic conductivity are different. All is applicable to pipe/tile drains (drain pipes) and open ditches for the control of the shallow water table. |
| DrainCalc | This hydrologic model does calculations on non-steady (transient, fluctuating) state discharge by horizontal subsurface drainage systems in agricultural land. The changes in hydraulic head (level of the water table) are also simulated. The model uses the concept of a non-inear reservoir, like in the RainOff program. This reservoir is characterized by reaction factor of discharge and hydraulic head (watertable height) on the recharge varying in time. The program calculates the reaction factor from discharge and head data, or it calculates discharge and head given the parameters of the response function. In addition, it provides the facility to find the response function from the parameters of the drainage system. All this is applicable to pipe/tile drains (drain pipes) and open ditches for the control of the shallow water table. |
| HydrCond | This is a calculator for the hydraulic conductivity of soils based on measurements of discharge and level of the ground water table in agricultural subsurface drainage systems. |
| WellDrain | This hydrologic model calculates the spacing of wells, the shape, depth, and level of the watertable in vertical drainage systems using pumped wells. Like EnDrain, it permits aquifers with various different properties and, in addition, fully/partially penetrating wells. |
