Catchment checks before CSR lake projects, and three years of proof after
TL;DR Catchwell surveys the land and drains that feed an urban lake before a company spends CSR money restoring it, then tracks water level, inflow and quality for three years afterwards. Corporate CSR teams and the NGOs they fund pay, because they need projects that last and evidence they can report.
Bengaluru lost 79% of its water-body area between 1973 and 2013[1], and companies now spend crores bringing lakes back. Much of that money goes into the lake bed while the catchment is ignored. Mphasis gave ₹1.89 Cr to restore Dommasandra Lake on Bengaluru's edge. The independent review found the desilting, bund, weir and fencing done, but the deepened lake stayed well short of full after a poor 2023 monsoon, inflow had not yet been seen working, and two sewage drains still ran into the lake[2]. Here's the thing - a lake is only as healthy as what flows into it.
Before a funder commits, Catchwell maps the lake's catchment on foot and from satellite data, covering every inlet, sewage outfall, paved area and blocked channel. It samples inflows in dry weather and after rain, checks what share of the catchment still drains into the lake, and estimates whether the lake can fill in an average year. The funder gets a short go, fix-first or walk-away report with costed catchment work.
After the works, Catchwell installs simple level gauges, samples inflows each season and reads nearby borewells. Each year the funder gets a plain report on whether the lake is filling, cleaner and recharging.
I narrowed the seed, which proposed AI-driven planning for whole urban watersheds, which no single buyer pays for. Lake catchments where CSR money is already flowing have a buyer, a budget and a deadline. Modelling helps, but fieldwork does most of the job.
Residents and lake groups benefit. The payer is the corporate CSR team or its implementing NGO. A company with an average CSR obligation of ₹10 Cr or more must commission an independent impact assessment of each ₹1 Cr-plus project a year after it ends, and can book part of the cost as CSR spend[3]. Fees would be per lake, and no public price exists, so you'll be setting it.
The impact-assessment rule turned outcome evidence into a compliance task[3]. Public money is also flowing: AMRUT has approved 3,032 water bodies for rejuvenation covering 1.09 lakh acres[4]. Funders who were burned by lakes that dried or stayed polluted now ask harder questions before signing.
No public figure exists for CSR spending on urban lakes or for catchment studies. The firm numbers are per project - ₹1.89 Cr for one mid-sized lake[2], and 3,032 water bodies approved under AMRUT[4]. Treat these as signs of activity, not a market size.
United Way Bengaluru restores lakes for corporate funders through its Wake the Lake programme and independent impact assessors review them afterwards[2]. Implementers focus on civil works, while assessors mostly interview residents and check that works were finished. Neither measures whether the catchment will feed a clean lake before money is spent, or tracks hydrology for years after. Catchwell sits between funder and implementer as an independent check.
| Difficulty | Moderate (36/100) |
| Starting capital | ₹35–65 L |
| Time to launch | 3–5 months |
The science is ordinary. The hard parts are access and independence. Lakes sit under municipal or irrigation departments, so even surveying inlets needs permission. Implementers may see you as an auditor out to fault them. And a "walk away" verdict loses the funder a project they had already announced.
No licence is needed to sell catchment studies, but you need permission to work on public lakes.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't trust a model to make the go or walk-away call. That verdict rests on fieldwork, lab results and a person who has walked the catchment.
Want to work out the AI layer for Catchwell? Talk to Yash →
Here's what can go south -
I like this for an environmental engineer or ecologist who already knows city lake groups and CSR teams. If you're hoping for software margins then this isn't it. First prove that two CSR funders will pay for a pre-project catchment study, and that one changes its plan because of what you find.
Plan for roughly ₹35–65 L, mostly field staff, sampling, lab fees and simple gauges.
No licence, but you need written permission from whoever owns the lake before surveying, and water tests should go to an accredited lab.
Yes, where companies or donors fund lake restoration. Check who owns the water bodies and local testing rules first.
The free Catchwell validation kit has the line-by-line capital breakdown, the effort scoring, the CSR and permissions checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for CSR heads and implementing NGOs, and 5 assumptions to test. Download the kit →
Thinking about building Catchwell or something close to it? The make-or-break work is getting funders to pay for a check that might tell them not to proceed, and that's the kind of pitch I help founders shape. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.