Site Drainage

controlling storm water runoff  is a major factor in preparing a grading plan. To  prevent problems caused by erosion or flooding, the principle of positive drainage is used. that is diverting storm water away from a building or area and carrying it away from a site in a storm drainage system. 

Surface drain lines are called storm sewers. Surface drainage call be provided by adjusting grounding slopes to allow for runoff storm water and its interception at various intervals in catch basins. Drainage systenis can be one of the higher cost stencils in site development and special assistance from a specialist engineer may be precluded. 

The design of a drainage system is based on the amount  of rainfall to be carried away at a given time. Runoffs that portion of precipitation which finds its way into natural or artificial challenges either as surface flow during the storing period or as subsurface flow after the storm has subsided. Runoff is determined  by calculating the volume of waiter discharged  from a give watershed area and is measured in cubic meter of discharge per second. Runoff is affected by two factors : (I) Intensity of a storm, amount of rainfall and its duration, and (2) Watershed characteristics -porosity of soil, gradient or slope and vegetative cover. 

Activity 1 

Describe in your own words the four contours shown in Figures and in the process bring out clearly the differences between Lillie.  Also discuss your answers witless the counselors. 

Activity 2 

For a project in your local area (say, a scoliosis or an industry or an antiparticle complex  or any other, already established or conking up), describe the evolution of the  use pluvial starting I'rum the programmer urinalysis  and site analysis. For an established project, this will be your case study aid for a project which is coming up, this will be your land use plan proposed.