The directors may acquire by purchase, lease, contract, or gift all lands and property necessary to carry out the plans and works of the district. The directors may acquire conservation easements as provided in Chapter 4 (commencing with Section 815) of Title 2 of Part 2 of Division 2 of the Civil Code on lands within the district. A district acquiring a conservation easement shall prepare a management plan for the easement which fully describes the intent and legal obligations respecting the easement and which shall be consistent with the goals of the State Soil Conservation Plan and other policies adopted pursuant to Section 9108.