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David Helms Profile picture
@davidhelms570
May 30 • 9 tweets • 10 min read Twitter logo Read on Twitter
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#KakhovkaReservoir #KakhovkaHPP
1/ Status Follow-up: 30 May 2023. Over-topping of #KakhovkaHPP dam continues, now occurring for a full month.
2/ Loop of several cloud-free Sentinel-2 passes of #KakhovkaHPP this month, latest 29 May 2023, show white turbulent flow downstream of sluice gates.
3/ @lhinnant published an article "Damage to Russian-occupied dam submerges Ukrainian reservoir island community" 25 May 2023 for @AP. Worth a read.
apnews.com/article/ukrain…
4/ Spatial context of @lhinnant story of the flooding of families in the village of Lysohirka, Zaporizhzhia, located on the farthest upstream portion, right bank, of the #KakhovkaReservoir. Image
5/ @riley_mellen and @heytherehaley also published an article for @nytimes on 17 May 2023 about #KakhovkaHPP water level. Article included a nice
#PlanetLabs image from 3 May 2023 clearly showing dam over-topping.
Image
6/ #KakhovkaHPP image taken back on 11 NOV 2023 by @Maxar. Image was taken the day after Russian occupiers blew up the road and rain deck about sluice gates 26-28 (far left side of image below) to block UAF pursuit of RF forces retreating to the left. Image
7/ With the start of water over-topping #KakhovkaHPP dam late April 2023, #KakhovkaReservoir water level has ceased increasing, remaining between 17.36-17.55 meters (almost 2 meters above normal) since May 1st as indicated by @PoleTheia water level data from Sentinel-6 altimetry. Image
8/ cc @iaeaorg
@energoatom_ua
@DefenceU
@Ukrhydroenergo
@pwebbr
@ResponsibleSci
@eugenesimonov2
@NFLAUKandI
@BrianKuns
@PeterGleick
@DetectorMedia
@a_prokip @gbrumfiel @tom_bike @Gergyl @BruckenRuski @novakakhovka_ua @huruank
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More from @davidhelms570

David Helms Profile picture
Jun 1
1/ I'm supporting @exit266 documenting the Black Sea Grain Initiative #BSGI #BlackSeaGrainInitiative providing marine wx impacting transit & inspection operations. This🧵is a bit off-topic, analyzing weather impact on @CarnivalCruise Sunshine cruise, 21-27 May 2023.
2/ On the evening of 26 May 2023 through mid-day 27 May 2023, the @CarnivalCruise ship #Sunshine experienced high winds and waves on its final leg of 21-27 May 2023 cruise from Charleston, South Carolina to The Bahamas Islands. Cite: @flyerscaptain @CrewCenter @CruiseHive @CNN Image
3/ First... some terms and definitions for the landlubbers ImageImage
Read 26 tweets
David Helms Profile picture
May 29
#NAFOWeather 🧵
1/ Weather week in review (23-29 May 2023): Widespread thunderstorms provided significant rain near the Line of Conflict (LoC), with a range of 15-90 mm in the south and 30-100 mm in the east and north. Image
2/ Rainfall from thunderstorms was not uniform with some locations close to the LoC receiving weekly peak total rainfall 80-105 mm including Oleshky, Vuhledar, Bakhmut and Raihorodka. Image
3/ Daily peak rainfall totals from thunderstorms max'ed out at 30-60 mm per day causing local flooding as reported by social media validating satellite precipitation accumulation analysis.
Image
Read 8 tweets
David Helms Profile picture
May 28
Time to update the map @PeterGleick
#WaterIsLife
worldwater.org/conflict/map/
Iran, Taliban exchange heavy gunfire in conflict over water rights on Afghan border #WaterIsLife
pbs.org/newshour/world… Image
@PeterGleick Water Dispute Escalating between Iran and Afghanistan, August 2016
atlanticcouncil.org/wp-content/upl… ImageImage
Read 5 tweets
David Helms Profile picture
May 15
1. Soil Moisture Update: 15 May 2023, a #NAFOWeather🧵
I'm "officially" declaring #MudSeason over based on limited rainfall since May 1st & marginal rain forecast in the next 2 weeks. Soil is dry enough to support most vehicles across most of the LoC.
2. Recent Rainfall (past 2 weeks): Donetsk and Luhansk received about 5-15 mm rain of on May 8-9, otherwise, a dry 2 weeks. Image
3. Soil Moisture Change (past 2 weeks): There has been a general soil drying trend from 30 April to 14 May with least moisture in the south and greatest soil moisture in Donetsk. Image
Read 11 tweets
David Helms Profile picture
May 8
#KakhovkaReservoir #KakhovkaHPP Status Follow-up: 8 May 2023. Upon further analysis of 6 May 2023 Sentinel-2 imagery and consultation with @tom_bike @Gergyl & @BruckenRuski, we believe the #KakhovkaReservoir water is "over-topping" the #KakhovkaHPP dam. /1
Time-series loop from 27 March 2023 to 6 May 2023. Note the "brightening" downstream (left side) of the #KakhovkaHPP sluice gates last frame in loop which is water flowing over the top of the dam. Over-topping is particularly evident on the 3 northern most sluice gates. /2
Why is this happening? Recall the Russian occupiers blew up the road and rail deck above the #KakhovkaHPP dam sluice gates on 10 NOV 2022 as part of the RF retreat ("strategic repositioning") from the Dnipro right bank. /3
Read 12 tweets
David Helms Profile picture
May 7
1. Ruschist operation of Kakhovka HPP (K-HPP) dam has been reckless. Kakhovka Reservoir (KR) water level has alternated from record low to record high in just 3 months. Loop (6 FEB-6 MAY 2023) shows sand bars receding with rising KR water. #NAFOWeather🧵
2. These images are of the K-HPP from Left: 6 FEB, and Right: 6 MAY 2023 (enhanced from data included in loop). ImageImage
3. North Crimean Canal intake, Left 20 FEB 2023 Right 6 May 2023: Latest image show water gushing through NCC intake gate at Tavrisk as record KR level is pushing water through gravity fed NCC at high rates. ImageImage
Read 7 tweets

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