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#drainage

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💧🌏 Greg Cocks

USDA 2024 Aerial Imagery Now Available For Download In Texas!🛩️🛰️
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datagateway.nrcs.usda.gov/ <-- shared USDA Geospatial Data Gateway (download the raster aerials here)
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“The USDA has released its 2024 National Agriculture Imagery Program (NAIP) aerial imagery, providing high-resolution, 1-meter data for all 254 Texas counties…
✅ Newly built bridge and highway infrastructure
✅ Stormwater & drainage evaluations (newly built drainage infrastructure)
✅ Right-of-way assessment (environmental analysis)…”
#GIS #spatial #mapping #RemoteSensing #NAIP #USDA #SpatialAnalysis #GISCommunity #AEC #AerialImagery #GISchat #InfrastructurePlanning #CivilEngineering #TransportationPlanning #LandSurveying #EnvironmentalAnalysis #EngineeringInnovation #opendata #Texas #USA #imagery #infrastructure #stormwater #drainage #rightofway #environmental #bridge #highway #planning #management #resource #reference
@USDA @NRCS

GIF
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💧🌏 Greg Cocks

The Great Dismal Swamp Has Released Millions Of Tons Of Carbon Since The Colonial Era, Research Finds
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whro.org/environment/2024-11-0 <-- shared article
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doi.org/10.1029/2024JG008137 <-- shared paper
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#GIS #spatial #mapping #climatechange #GreatDismalSwamp #carbon #NorthCarolina #Virginia #USA #engineering #water #hydrology #swamp #habitat #biodiversity #humanimpacts #carbondioxide #landuse #change #wetlands #peatlands #carbonsink #methane #model #spatialanalysis #spatiotemporal #research #peat #peatswamp #drainage #ditches #engineering #reclamation #peatfire #mitigation #ecosystem #carbonloss #hydrospatial

photo - A researcher moves through the Great Dismal Swamp in Virginia.
Schematic - ash mass concept. For a column of peat exposed to drainage, the surface peat is exposed to more oxidation and therefore carbon is lost but the ash content is conserved. This demonstrates how carbon loss can be calculated using the remaining ash in the peat column. The terms correspond to the terms in Equations 1-5, with r = reference layer and i = impacted layer. The dashed line in the second column indicates the loss. The loss in thickness due to shallow subsidence results from the difference in the bulk densities, whereas the secondary subsidence results from the loss in elevation due to oxidation, driven by the differences in ash mass.
Maps - coring locations, ditches by age, dominant vegetation communities. Contours correspond to estimated peat depths based on Oaks and Whitehead (1979). Coring locations are indicated by the following numbers: 1. GDS519, 2. GDS520, 3. GDSW1, 4. GDS77, 5. GDS83, 6. GDS528, 7. Interior-South, 8. Interior-North, 9. GDS96, 10. GDS-P + H, 11. GDS542, 12. GDS-04-14-2022-1A, 13. GDS-04-14-2022-1B. (a) Map of Great Dismal Swamp National Wildlife Refuge (GDS NWR) showing coring locations and binned ages of ditch, canal, and railroad installation, (b) Map of GDS NWR showing dominant vegetation communities within GDS NWR. The “early successional” (marsh) area to the southeast of Lake Drummond corresponds to the area burned in both 2008 and 2011. The area bounded by shading represents the Great Dismal Swamp NWR boundary.
charts - Carbon stocks and accumulation at GDS sites. (a) Carbon stocks for all sites, including two calculations for heavily impacted sites (GDS-W1, GDS-77, and GDS-P&H). Stars indicate calculations from ash mass from the lower depths of each of those cores, while the other (b) calculation for these sites indicates the lower ash mass calculation using the average of other less disturbed sites. Burn scar cores calculations are down to the first charcoal peak (a) and down to the second peak (b) for GDS-Interior-North and South. (b) Carbon accumulation and loss rates for cores with vegetation reconstructions. Negative values indicate carbon loss values.
Public
David Hembrow

Short thread of photos from the last few days of cycling, beginning with this photo of an obstruction on a cycle-path which I came across twice on a short delivery run to @twilwel this afternoon.
Given that I used to live in a country where they didn't maintain drainage ditches properly and which flooded regularly (partly) as a result, I don't complain too much about occasionally being inconvenienced by this work...
davidhembrow.blogspot.com/2014
#cycling #biketooter #regel17 #ligfiets #velomobile #rain #wind #drainage

Velomobile on a cycle-path being impeded by a tractor which is scooping stuff out of a drainage ditch. This is done regularly all over the Netherlands and helps to stop the country from flooding - including on days like today when it's raining a lot.
Replied in thread
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HistoPol (#HP) 🏴 🇺🇸 🏴

(8/15)

[Footnote II of V:
10th #AtmosphericRiver in #California on 03/11/2023:]

"...potential strategy to increase #WaterSecurity...

The technology is a combination of #rehabilitation of marginal #soils, #drainage improvement, #WaterStorage, optimal utilization of available radiant energy, and attenuation of the effects of #frost. The main feature of this system is the construction of a network of #embankments and #canals."

Take a look of the cartographed #ElNiño events in #SouthAmerica...

Map of South América showing the categorized impact of flooding caused by recurring #ElNiño events
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