Discharge Estimation by Rational Method using
Global Mapper GIS for Sustainable Stormwater
Management: A Case Study from Pune City
Journal:
GRENZE International Journal of Engineering and Technology
Authors:
Nivedita G Gogate
Volume:
1
Issue:
1
Grenze ID:
01.GIJET.1.1.12
Pages:
44-52
Abstract
The sharp rise in urban development has led to an increase in impervious areas
and a decrease in vegetated surfaces. The thrust toward this development has caused
drought and overflow problems to occur. In the 1960s, management of stormwater quantity
for flood prevention was the only imperative in the developed countries, but in subsequent
decades, objectives for stormwater management have diversified to include quality,
ecosystem health, reuse, integration with urban design etc along with quantity and has
inspired the development of novel stormwater management approaches designed to
minimize impervious cover and maximize infiltration of rainfall known as Low Impact
Development (LID) in USA and Water Sensitive Urban Design (WSUD) in Australia. The
massive urbanization in India has resulted in generation of huge quantities of stormwater
which are unutilized and polluted. Managing urban stormwater in India poses huge
challenges and the consequences of its neglect are severe. India too needs to adopt
sustainable practices in overall water management. Stormwater is being managed in a
traditional way in most of the urbanized cities of India. At many places, natural drains
simply carry the runoff and engineered infrastructure is absent. This has led to the problem
of localized flooding and consequent deterioration of roads. In order to study the present
stormwater situation, a case study of Pune city in Maharashtra state is selected. In this
work, an attempt is made to determine the stormwater quantity in a sub basin of Pune city
by rational method using Global Mapper GIS software. It also presents the analysis of
stormwater quality in the same sub basin. The constraints in adopting sustainable
techniques are discussed with respect to the case study. This data will be further used to
identify suitable sites for stormwater recharge subsequently.