Grading and Drainage Plan in Central New York

What a grading and drainage plan does

A grading and drainage plan sets the finished ground elevations around a house or building and shows where every drop of runoff goes: off the roof, off the driveway, around the foundation, and off the lot. Builders need one when the town asks for proposed grades on the permit. Homeowners need one when water is pooling against the house, cutting across the yard, or running onto (or coming from) the neighbor's lot.

The short answer: the plan shows the slopes, swales, pipes and discharge points that move water away from the house to a legal outlet, and Backwell builds it to those grades.

Plans are prepared and stamped by a New York licensed Professional Engineer (PE). Backwell coordinates the design, the town permit submittal, and the site work.

What the code says about lot grading in New York

The Residential Code of New York State (the 2025 edition took effect December 31, 2025) sets the baseline in section R401.3, Drainage:

• Surface drainage has to be diverted to a storm sewer or another approved point of collection that does not create a hazard.
• Lots have to be graded to drain surface water away from foundation walls.
• The grade has to fall at least 6 inches within the first 10 feet from the foundation.
• Where lot lines, walls or slopes make 6 inches in 10 feet impossible, drains or swales have to be built to carry water away from the structure.
• Hard surfaces (driveways, patios, walks) within 10 feet of the foundation have to slope at least 2 percent away from the building.

Section R405.1 adds foundation drains around concrete or masonry foundations that enclose habitable or usable space below grade. Those drains have to discharge by gravity or by pump into an approved drainage system. A grading plan picks that outlet.

Two more state rules decide where water can go:

• The Plumbing Code of New York State, section 1101.3: storm water shall not be drained into sewers intended for sewage only. Downspouts, footing drains and sump pumps do not go into the sanitary sewer.
• For houses on septic, 10 NYCRR Appendix 75-A says roof, footing, garage, cellar and surface water drainage must be kept out of the septic system.

The building code's model grading appendix (Appendix J) is listed in the 2025 Building Code of New York State as informational only. In practice, that means grading permits and lot grading standards come from your town's own local laws and the permit reviewer, on top of R401.3.

Neighbor runoff: what New York law allows

This is the question behind most drainage calls. A 2015 paper by the Cornell Local Roads Program, posted by NYSDEC, summarizes the New York rule for surface water. New York follows a "reasonable use" rule, set out by the Court of Appeals in Kossoff v. Rathgeb-Walsh (1958). In plain terms:

• An owner can grade, pave and build in good faith to put the land to a reasonable use, even if that changes how surface water flows, and is generally not liable for the change.
• The line is artificial collection. An owner may not gather surface water with pipes, ditches or drains and dump it in a mass onto a neighbor's land.
• A lower owner is not required to accept surface water from above and may fill or grade in good faith, even if that sends water back.

The paper also covers natural watercourses and prescriptive easements, which follow different rules. This is a summary, not legal advice. The design lesson is practical: a good grading plan spreads water and sends it to a legal outlet. It does not pipe the backyard straight at the property line.

When a grading plan is part of a stormwater permit

If the job disturbs one acre or more of soil, the owner needs coverage under the NYSDEC SPDES Construction General Permit, GP-0-25-001 (effective January 29, 2025 through January 28, 2030), and a stormwater pollution prevention plan (SWPPP). For a single-family home that disturbs between one and five acres, the SWPPP normally covers erosion and sediment control only.

The exception that matters in Onondaga County: the permit's Appendix C lists the Onondaga Lake watershed as a watershed requiring enhanced phosphorus removal. A single-family home in that watershed that needs permit coverage falls under Table 2, and its SWPPP must also include post-construction stormwater management practices. That is a grading and drainage design question as much as a paperwork one. See erosion control plan.

Many Onondaga County towns and villages are regulated MS4 municipalities in the Syracuse Urbanized Area, including Camillus, Cicero, Clay, DeWitt, Geddes, LaFayette, Lysander, Manlius, Marcellus, Onondaga, Pompey, Salina and Van Buren, plus several villages. When an MS4 town has review authority over construction, it signs off on the SWPPP before DEC coverage.

What goes on the plan

• Existing ground shown with contours or spot elevations, tied to the survey
• Finished floor and garage floor elevations
• Proposed grades around the house with the 6 inches in 10 feet fall shown
• Swales with their slopes and where they discharge
• Downspout and sump discharge routes, kept out of the sanitary sewer and the septic
• Footing drain outlet (daylight, storm sewer, or pump)
• Driveway grades and any culvert under the driveway at the road
• Septic tank and absorption field, with surface water directed away from them
• Retaining walls or steep slopes where the grade change is too big for a swale
• Silt fence, stabilized construction entrance and topsoil stockpile location during the work

How it works with Backwell

1. Send the address and photos. Show where water sits, where it comes from, and where the downspouts go. Estimate in 1 hour.
2. Survey and elevations. The plan is drawn on the boundary survey with existing ground elevations, so the slopes are real numbers, not guesses.
3. Design. The PE sets finished grades, swales, pipe sizes and the outlet, and checks the result against R401.3 and any town requirement.
4. Town submittal. For new construction, the plan goes in with the building permit. For a stormwater permit, it becomes part of the SWPPP.
5. Build it. Backwell cuts and fills to grade, shapes swales, installs drains and culverts, spreads topsoil and stabilizes the ground. See grading and drainage and storm drainage.

Common problems and the fix on paper

New house sits lower than the road or the neighbors

The finished floor gets set high enough that the 6 inches in 10 feet fall works, and swales along the side yards carry the upslope water past the house. Setting the floor elevation is the cheapest fix there is, and it only works before the foundation is dug.

Water from the uphill lot crosses your yard

Under the reasonable use rule, you are generally allowed to grade your own land in good faith to deal with it. The usual design is an interceptor swale along the uphill side that carries water around the house to a legal outlet, instead of a berm that just ponds it.

Your new driveway or addition is about to send water next door

Spread it, slow it and outlet it on your side. That means a swale or a stone infiltration trench instead of a pipe aimed at the property line, which is the kind of artificial mass discharge the case law warns about.

Garage floor or driveway pitches toward the house

R401.3 wants hard surfaces within 10 feet of the foundation sloped at least 2 percent away. The plan re-sets the slab and driveway grades, and adds a trench drain only where grade alone cannot do it.

Basement gets water every spring

Surface grading is step one. If groundwater is the problem, footing drains or a curtain drain may be needed. See yard drainage design and drain tile repair.

Septic field sits in the path of runoff

Appendix 75-A requires surface water to be kept off the septic system, and for raised systems on sloping sites it requires a diversion ditch or curtain drain uphill. The grading plan and the septic design have to agree. See septic engineer.

Timeline

For an existing house, the plan comes after the survey and elevations. Whether the town wants a permit for regrading depends on its local law, and that gets checked for your parcel. For new construction, the plan goes in with the building permit. If one acre or more is disturbed, the SWPPP, the MS4 acceptance (where the town has review authority) and DEC's Letter of Authorization come first. The written estimate lists the schedule for your job.

Sources

Rules change. These are the documents this page is based on, checked October 2026.

• Residential Code of New York State 2025, Chapter 4 Foundations (R401.3, R404.4, R405.1), UpCodes
• Plumbing Code of New York State 2025, Chapter 11 Storm Drainage (1101.3, 1112, 1113), UpCodes
• NYS Department of Health, 10 NYCRR Appendix 75-A, wastewater treatment standards for individual household systems
• Building Code of New York State 2025, Chapter 1 Scope (agricultural buildings, appendices), UpCodes
• Cornell Local Roads Program, Drainage Law and Drainage Situations and Problems in New York State (2015, hosted by NYSDEC)
• NYSDEC, Stormwater Permit for Construction Activity (GP-0-25-001 page, forms, eNOI)
• NYSDEC, SPDES General Permit GP-0-25-001 for Stormwater Discharges from Construction Activity (full text)
• Onondaga County, Syracuse Urbanized Area automatically designated MS4s
• 19 NYCRR 1203.3, Uniform Code administration: building permits and construction documents (Cornell LII)
• NYS Department of State, 2025 Uniform Code adoption (effective December 31, 2025)