local watersped = 100 --  normal is 25
for i,v in pairs(game:GetService("Workspace"):GetDescendants()) do
if v:IsA("Part") and v.Name == ("Sand") then
v.Velocity = Vector3.new(0,0,watersped)
end
end

for i,v in pairs(game:GetService("Workspace"):GetDescendants()) do
if v:IsA("Part") and v.Name == ("Water") then
v.Velocity = Vector3.new(0,0,watersped)
end
end