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swcEcon 0.1.0

First CRAN release

New functions (16 exported)

• calc_bcr() – Benefit-cost ratio with discounting, benefit lag, residual value.
• calc_npv() – Net present value with annual cash-flow table.
• calc_irr() – Internal rate of return via bisection (Brent 1973).
• calc_pbp() – Simple and discounted payback period.
• calc_mrr() – Marginal rate of return (CIMMYT 1988).
• calc_mbcr() – Modified benefit-cost ratio (Gittinger 1982).
• calc_soil_loss_cost() – USLE-based soil loss economic valuation.
• calc_nutrient_cost() – NPK replacement cost from erosion.
• calc_water_value() – Groundwater recharge and runoff harvesting value.
• calc_irrigation_benefit() – Additional crop income from SWC-enabled irrigation.
• calc_employment() – Employment generation ratio with MGNREGS norm check.
• sensitivity_analysis() – One-at-a-time sensitivity analysis (8 scenarios).
• calc_switching_value() – Switching value for cost and benefit.
• monte_carlo_swc() – Stochastic BCR/NPV simulation (Pouliquen 1970).
• run_swc_pipeline() – Full appraisal pipeline in one call.
• generate_swc_report() – Self-contained HTML economic appraisal report.

Datasets (6)

• swc_benchmarks – Real: NABARD WDF Reports 2010-2022; PMKSY-WDC (GoI).
• usle_india_soils – Real: NBSS and LUP Technical Bulletin 132 (ICAR).
• rainfall_erosivity_india – Real: IMD + Bhattacharyya et al. (2010).
• swc_cost_norms – Real: PMKSY-WDC Common Guidelines (GoI 2015).
• watershed_projects – Hypothetical: set.seed(2025), 50 projects.
• farmer_adoption – Hypothetical: set.seed(2025), 120 households.

Technical notes

• All source files are pure ASCII – CRAN portable.
• Dataset documentation uses NULL sentinel pattern for roxygen2 compatibility.
• Zero runtime dependencies beyond base R (stats, graphics, grDevices, utils).
• markdown = FALSE in DESCRIPTION – plain Rd syntax throughout.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.