Pak Phanang River BPBasin is located on the east co of Southern peninsular of TdoastnThailand, betwe 7o 45/ – 8oeen
o/o/30 latituudes and 99 41 -100 30 east l1longitudes, covvering the area of 307,561 hecta [1]. It encooaresompasses most
part of Nakhon Si ThaNammarat Provinc Its topograp consists of mountains and foot slopes in the west. Thece.phyd
land slop down towar the east, whpesrdshich consists of a former coasta plain, a flood plain, a formal tidal flat, andaldl
a coastal plain along the coastline of th Gulf of Thaileheland.
bhanang is characcterized by a noorth-south trend of the mounta and the foot slope areas indainThe basin of Pak Ph
the west covered with tropical rainfortrest. However, w the increasing trend of deforestation in the headwaterwith