Rational Method is a rather conservative method. One of the basic assumptions of the rational formula is that the rainfall intensity must be constant for an interval at least equal to the time of concentration. For long duration of rainfall, this assumption may not hold true.
The puzzle piece was first associated with Autism Awareness when it was used within the logo for National Autistic Society in the UK in 1963. The logo of the society was designed by a neurotypical parent of an Autistic child who was a member of th...
Definition of autism : a variable developmental disorder that appears by age three and is characterized by impairment of the ability to form normal social relationships, by impairment of the ability to communicate with others, and by repetitive behavior patterns â called also autistic disorder; see autism spectrum disorder