There are several small rains fed nalas on the uphill slopes in and around the subsidence zone. The discharge from these nalas and  the surface run-off from the road side as well as up-hill slope of
the surrounding areas enter into the downslope thick ov
Report on the preliminary post disaster landslide studies in and around Tawang Town, Tawang District, Arunachal Pradesh by W. S. Rocky and G. Rongmei, Senior Geologist,Engineering Geology Division & S.C. Keshari, Senior Geologist, SU: GSI, Itanagar,  Geo
Changpu sinking zone
Construction of retaining wall, Construction of road side drains and catch water drains
Poor drainage system in the area