Flooding

Flooding is essentially just one output from improper watershed management . The flood disaster is becoming popular in almost the same time ( in early 2007 ) in several Indonesian cities and counties are forced to experience this disaster , even Jakarta which incidentally is the capital of the Republic of Indonesia was forced to water. Fairly heavy floods also been experienced by Jakarta in early 2002 that inundated most of the regions of DKI Jakarta , although not as good as the early flood of 2007 .From the results of monitoring in the field , we can identify some of the causes of flooding in biofifik namely very high rainfall , karakterisitk DAS itself, narrowing drainage and land use change .Explanation of the causes of flooding in the above are as follows :Rainfall . Rainfall during flood jakarta on the 18th January 2002 , due to the daily rainfall of 105 mm / day , then flooding the second on the 30th of January 2002 due to rainfall of 143 mm / day . Whereas rainfall over 50 mm / day should be wary . Floods in Jakarta and surrounding areas on February 3, 2007 based on observational data and water level in the Ciliwung river discharge observation post dam Katulampa show number 250 cm , whereas the water level beyond 100 cm numbers already have standby . Rainfall reached 172 mm / day ( already exceeded flood of Jakarta in 2002 ) . With the length of the rain that started early January 2007, causing the soil to become saturated with water so that when the rain is mostly rainwater runoff ( run off ) . Also at the same time the sea on the north coast of Jakarta rose .Characteristics of the watershed . Watersheds ( DAS ) which , causing flooding jakarta is Ciliwung - Cisadane . Watershed characteristics include the shape and slope . Characteristics Ciliwung - Cisadane have form the headwaters and middle with a steep slope . While the middle and downstream area is very flat and wide . The watershed shape so the rain falls, the rain water from upstream to flow directly to the bottom with a short time of concentration .Drainage channels . Drainage has a very important role as a way for water to get to the sea which is the ultimate goal of running water . The volume of the Ciliwung River drainage downstream areas here and there especially shrinkage caused by the size of width is reduced, and there is growing sedimentation behavior of people throw garbage in the river .



By:
Nama : DIANA AFRIANITA 
Kelas :XII RPL 2
No.abs: 05