A senior official, privy to the report submitted both to the Centre and state government, told TOI on Saturday: “Prima facie, it appears that at least 25% area of Joshimath, which has a population of about 25,000, has been affected by the land-subsidence problem. A survey to ascertain the intensity of damage (to buildings and sundry structures) is currently underway. It will be put in three categories: severe, moderate and slight.”A senior official, privy to the report submitted both to the Centre and state government, told TOI on Saturday: “Prima facie, it appears that at least 25% area of Joshimath, which has a population of about 25,000, has been affected by the land-subsidence problem. A survey to ascertain the intensity of damage (to buildings and sundry structures) is currently underway. It will be put in three categories: severe, moderate and slight.”