Engineering Hydrology

Developing an empirical formulae to estimate rainfall intensity in Riyadh region

“…In this method, the frequency precipitation depth P T (in mm) for any rainfall duration t d (in hour) with specified return period T r (in years) is computed using the following relation (Wilson, 1990):…”

A modified Muskingum routing approach for floodplain flows: Theory and practice

“…The particular value that generates the narrowest loop and can be best fitted with a straight line is considered the best estimate of x. The inverse slope of this line gives the required value of K. Although the graphical method is generally satisfactory (Chow, 1964;Linsley et al, 1975;Viessman et al, 1972;Wilson, 1990), it is time consuming to apply. Furthermore, no objective-selection criteria exists for choosing the appropriate value of x and the method therefore, requires a level of subjective interpretation to determine a value that optimises the linear relationship (Gelegenis and Serrano, 2000;Yoon and Padmanabhan, 1993;Chang et al, 1983).…”

Hydrological Dynamics I: Surface Waters, Flood and Sediment Dynamics

“…It is beyond the scope of the current chapter to describe all the hydrological techniques available to evaluate the terms in the wetland water balance. These techniques are discussed in hydrological texts such as Shaw (1994) and Wilson (1990) whilst Gilvear and Bradley (2000) provide a useful summary of their application to wetlands. Instead, a number of examples of wetland water balance evaluations are summarised in order to demonstrate the range of techniques that can be applied.…”

“…The curves express the percentage of time during which certain water depths are equalled or exceeded, and are analogous to fl ow duration curves used to characterise the regime of streams and rivers (e.g. Wilson 1990;Shaw 1994). Figure 6.10b shows that surface water was present along Transect 3 for approximately 43% of the period and further demonstrates the absence of surface water along Transect 2.…”