Drainage & Grading · Riverside South, ON
French drains and yard drainage in Riverside South
Yard drainage and French drains for Riverside South homes. Most lots here are graded to send runoff into the community’s creek and pond system, and the fix keeps that plan working.
- Clear stone
- Filter fabric
- Perforated pipe
- Dimpled membrane
The local picture
Drainage & Grading in Riverside South
The City’s design plan organizes Riverside South around the Mosquito Creek valley, a set of stormwater ponds and a green corridor along the top of the river slope. Lot grading sends runoff into that system. Owners are expected to keep the original grades and keep swales and catch basins open, so a drainage fix works inside that plan.
Clay under a new yard holds water, and a swale that has been filled with soil, sod or a garden bed stops carrying it. We compare the yard to the grading plan, restore the swale where it has been blocked, and add a shallow French drain where water keeps collecting. Yards next to the creek valley keep fill and runoff out of the valley slope.
One link in the stormwater chain
Swales, catch basins, ponds and Mosquito Creek
Korvex Construction restores swales, regrades yards and installs shallow French drains for Riverside South homes, on the established streets and the newer phases between the Rideau River and Bowesville Road. The free on-site estimate starts at the rear lot line, where the swale usually runs, and a written quote follows.
A Riverside South backyard is one link in a chain. The rear swale passes water to a catch basin, and the City’s lot grading FAQ says a backyard catch basin serves your lot and the lots around it and leads directly to a nearby waterway. On Mosquito Creek, the Rideau Valley Conservation Authority records two stormwater management facilities built on the most westerly branch to meet water quality and quantity objectives.
Blocking that grate, the City warns, may increase the chances of local flooding. A wet Riverside South yard often comes back to one of two things: a swale that has been raised or interrupted, or a catch basin that water cannot reach.
Lots on the edge of the creek valley
Mosquito Creek and its tributaries run through well-defined valleys and ravines that the Rideau Valley Conservation Authority describes as actively eroding, with over-steepened banks where the meanders meet them. Its report notes erosion and slope stability hazards throughout the stream and valley system. Floodplain mapping covers the creek from downstream of River Road to the Rideau River; further upstream, high flows stay inside the valley.
At a lot on the valley edge, we look for an outlet on level ground well back from the top of the bank, and we avoid adding fill near it.
At the site visit
What we check on a lot in Riverside South
- 01
The rear swale: its line, and whether a fence, shed, garden or patio sits in it.
- 02
The backyard catch basin grate: clear, or covered by sod, mulch or raised landscaping.
- 03
The grading plan for a newer lot, and how the yard compares to it.
- 04
Distance to the Mosquito Creek valley or the Rideau River slope.
- 05
Fence posts or deck footings set in the swale line.
- 06
Where each downspout sends its water across the yard.
What we plan around
Local conditions in Riverside South
Each point links to the public source it was checked against. At the site visit we check how it applies to your lot.
- Recent lots and grading plans
Owners are expected to keep the grades set by the original grading plan, and swales and catch basins stay open. Newer homes are more likely to have that plan on record with the City.
- Mosquito Creek valleylands
The creek valley is the centre of the community’s open space system. Yards next to it keep fill and runoff out of the valley slope.
How we build it
How a drainage fix is built
Every lot drains differently. The drawing shows the parts most of our drainage jobs use.
- Find the source
Roof water, runoff, a neighbour’s slope or a high water table: each needs its own fix.
- Outlet first
Chosen before digging. A drain with nowhere to discharge only moves the puddle.
- Protect the foundation
A dimpled membrane under the stone can steer water away from the wall.
- Grade the surface
Finished ground slopes away from the house, toward the drain.
- Clear-stone surfaceOpen stone over the membrane, so water gets off the surface fast and is carried away from the wall.Open and free-draining
- Filter fabricKeeps soil from washing into the stone and clogging it over time.Laid over the soil
- Perforated pipe, where neededCollects water in the trench and carries it to the planned outlet.Laid to fall
- Stone beddingSurrounds the pipe so water can reach it from all sides.Levelled across the area
- Graded native soilTrench bottom shaped to fall steadily toward the outlet.To firm ground
Projects
Drainage and grading we have built
Recent jobs from across Ottawa.
“Vlad and his coworkers are very hard working and professional with a realistic and fair pricing that cant beat any other company out there ! We just had a major leak in our basement and they efficiently waterproofed the foundation and created a french drain with outstanding finish of layering gravel and pavement reconstruction. They are the people to call for almost any kind of work on your house !! Thank you guys God Bless & Respekt!”
Gio Ivana Herrera · French drain after a basement leak
FAQ
Drainage & Grading in Riverside South: common questions
Our fence crosses the swale. Could that be why the yard stays wet?
It can be, when the bottom boards, posts or a strip of gravel at the base hold water back. The City’s lot grading FAQ says swales must not be filled, piped or obstructed by landscaping features. We look at how water passes along the fence line and correct the swale or the bottom of the fence so the flow gets through.
We live near Mosquito Creek. Do we need the conservation authority’s approval?
Possibly. Within the Rideau Valley Conservation Authority’s regulation limit, development and site alteration need its permission, and site grading and fill count. Its Map a Property tool shows whether a lot may be subject to the regulation. We check yours before planning any regrading or outlet near the valley.
A swale runs through our backyard. Can we fill it in?
No. City of Ottawa rules expect owners to keep swales open: they cannot be filled, piped or blocked by sheds, gardens or other landscaping. Water from your lot and your neighbours’ lots depends on it, so patios, fences and drainage are planned around the swale.
Will a new patio affect our lot grading?
It can, so the patio is built to fit the plan. City of Ottawa rules expect owners to keep the grades from the original grading plan and never cover swales or catch basins. We check what applies to your property and set patio height and slope to match.
Why does my yard stay wet long after rain?
Much of Ottawa sits on clay, which drains slowly, so water that has nowhere to run stays near the surface. The usual causes are a low spot, a yard that has lost its slope, water arriving from a neighbour’s higher lot, or downspouts emptying onto the lawn. We walk the yard, ideally after a rain, find which of these it is, and fix that: regrading, a French drain to an outlet, or both.
Book a free drainage estimate in Riverside South
Tell us what you want built and send a few photos. We come out, look at what sits under the job, and give you the scope and the price in writing.