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Force-System Resultants and Equilibrium
Published in Richard C. Dorf, The Engineering Handbook, 2018
An infiltration basin is either constructed in a natural depression in the landscape or by an embankment that captures rainwater runoff and allows infiltration of the water into the soil in a maximum of 72h The basin must be constructed out of soil that is very permeable and the bottom must be at least 4ft above the seasonal groundwater high or bedrock. Vegetation adds aesthetic beauty and also breaks up the surface soil, which keeps the surface area from getting plugged [Urbonas and Roesner, 1992].
Design of infiltration basin
Published in James C. Y. Guo, Urban Flood Mitigation and Stormwater Management, 2017
An infiltration basin is a hydrologic system that is operated with the inflow determined by the design rainfall and the outflow determined by the design infiltration rate. The storage volume in the basin shall be maximized through the selection of rainfall duration. Usually, the design event for an infiltration basin is much longer than the time of concentration, which is often used for peak flow predictions.
A systematic approach for effective storm water management at building level during extreme rainfall events – a case study
Published in Urban Water Journal, 2022
Vasantha Kumar S., Shishodiya Ghanshyam Singh
In general, any stormwater management plan must take into consideration the following two major aspects while designing it. One is the effective utilization of precious stormwater for recharging of the groundwater. This is highly applicable for southern states like Tamilnadu where the rivers are not perennial and hence the rainwater harvesting becomes very important. The second major aspect while designing the stormwater management system is the effective management of runoffs due to heavy rainfall, the failure of which would lead to flooding on streets and water stagnation surrounding the buildings. In this study also, these two major aspects were given the top priority by the estates department while devising a suitable stormwater management plan for the case study building considered. Thus, an infiltration basin was proposed and constructed by the estates department. Figure 6 shows the infiltration basin constructed at the low-lying area identified by the total station survey. An infiltration basin is a naturally formed or a constructed structure that is used to store the stormwater and infiltrate into the ground. As we can see from Figure 6, there are two inlets on opposite sides, one for taking the water from eastern side of the Gandhi block and the other inlet for drawing the water from western and southern sides. How much amount of water the infiltration basin can store is a key design element and in order to calculate it, we must know the volume of water that got stagnated during the heavy rainfall reported on 26 November 2020. The volume can be calculated by multiplying the water stagnated area and the depth of water. The area of water stagnation (area of black colored polygon in Figure 4) was calculated as 1394.32 sq.m and the depth of water was measured as 0.35 m. Thus, the volume of water that got stagnant in the low-lying area on 26 November 2020 was 488 cu.m. So, the infiltration basin must have a water holding capacity of more than 488 cu.m. For the infiltration basin shown in Figure 6, the volume was calculated by multiplying the cross-sectional area of the basin (by applying the trapezium formula) and its length. The volume of the infiltration basin was thus calculated as 662.59 cu.m which is well above the water that got stagnated earlier, i.e. 488 cu.m. Thus, when heavy rainfall comes, all the runoffs surrounding the building can be diverted to the infiltration basin safely and thus can be used for recharging of the groundwater.