NBS Unit India value Linkage policies incentives monitoring small ponds key aspects intervention crucial role relationship flood control administration crucial aspect Recommendations Circular Economy natural processes nutrient retention regenerative system larger water bodies carbon sequestration Nature-Based Solutions objective policymaking cost-effective approach innovative technologies degraded pond ecosystems biodiversity conservation P ond Rejuvenation project sectoral development plans Allegiance Water Management effective pond conservation inter-departmental approach essential ecosystem services coordinated inter-ministerial sustainable development goals holistic restoration strategies comprehensive national pond database Pond Rejuvenation Allegiance Enterprise uniform waterbody classification system