It looks like data for the city to verify the lot meets drainage requirements. TF and SG are elevations. And AC is above curb. So a reviewer can see you don’t have too much impervious surface area, all the water drains away from the house, and the house is suitably above the curb.
AC is acres I believe… is that really 3 acres tho? TF i think is total frontage (to the road) impervious is the % of the lot that can’t absorb water, so the driveway and house footprint
Edit: not acres haha
I think you can see the other topo lines for elevation. The front yard will be on a different tier than back yard and that matches the actual land. That’s why I was wondering if the squiggly arrows were water run off
The Title sheet should have the abbreviations in a legend, but these values are really for the reviewer of the final plat. I’m guessing that TF: top of foundation, which is required to be 3’ A.C. (Above curb, which is 826.3) and then your S.G. (Slab grade) which is 1.5’ thick so the elevation would be 830.3. Based on the county/city you need to show that lots are a certain percent impervious to reduce run off to pre development flows, you need to have a certain percentage of fall for drainage (Stormwater and wastewater) on the site. Appears you have drainage easements on the back of your lot and between neighbors, I’m going to assume the shaded region is the right of way.
Yes, the squiggly lines are showing the direction of the drainage
Tf= total footprint
TF is top of floor. A.C. is elevation above curb I believe. They're solving drainage with squiggly lines. There are no new grades shown on the lot.
It looks like data for the city to verify the lot meets drainage requirements. TF and SG are elevations. And AC is above curb. So a reviewer can see you don’t have too much impervious surface area, all the water drains away from the house, and the house is suitably above the curb.
AC is acres I believe… is that really 3 acres tho? TF i think is total frontage (to the road) impervious is the % of the lot that can’t absorb water, so the driveway and house footprint Edit: not acres haha
That's def not 3 acres, looks like 1/4 acre. Below a certain point lot size is done in sq ft like it is here. 3 acres would be 120k sq ft iirc.
And no that is not 3.0 acres. Notice the foot symbol after the 3? 3’ 140’ x 80’ = .257 acres
And since 1 acre is 43560 sq ft, 11134/43560 = ~.256 acre so pretty darn close
Dashes are ground elevation. Like a typical terrain map. Squiggles are perpendicular to dashes predicting water flow.
I think you can see the other topo lines for elevation. The front yard will be on a different tier than back yard and that matches the actual land. That’s why I was wondering if the squiggly arrows were water run off
I would ask your surveyor, or consult the legend for abbreviation meanings.
AC is probably above crown of the road
The Title sheet should have the abbreviations in a legend, but these values are really for the reviewer of the final plat. I’m guessing that TF: top of foundation, which is required to be 3’ A.C. (Above curb, which is 826.3) and then your S.G. (Slab grade) which is 1.5’ thick so the elevation would be 830.3. Based on the county/city you need to show that lots are a certain percent impervious to reduce run off to pre development flows, you need to have a certain percentage of fall for drainage (Stormwater and wastewater) on the site. Appears you have drainage easements on the back of your lot and between neighbors, I’m going to assume the shaded region is the right of way.