This is what is known as an
effect.
It cannot be added server sided but you can add it to a jet vehicle for a custom map or mod as follows.
rem *** e_WaterFrontBig ***
ObjectTemplate.create EffectBundle e_Jetwater
ObjectTemplate.saveInSeparateFile 1
ObjectTemplate.loadSoundScript Sounds/e_waterfrontbig.ssc
rem -------------------------------------
ObjectTemplate.addTemplate Em_JetWaterFrontBig
ObjectTemplate.setRotation -179.999/0/0
ObjectTemplate.addTemplate Em_JetWaterFoam
ObjectTemplate.setRotation -179.999/0/0
ObjectTemplate.addTemplate Em_JetWaterFoamR
ObjectTemplate.setRotation -179.999/0/0
ObjectTemplate.timeToLive CRD_NONE/-1/0/0
rem -------------------------------------
ObjectTemplate.minDistanceUnderwaterSurface 0
ObjectTemplate.maxDistanceUnderwaterSurface 90
rem *** Em_WaterFrontBig ***
ObjectTemplate.create Emitter Em_JetWaterFrontBig
ObjectTemplate.template Fx_JetWaterFrontBigMesh
ObjectTemplate.looping 1
ObjectTemplate.startAtCreation 1
ObjectTemplate.lodDistance 600
ObjectTemplate.timeToLive CRD_NONE/0.4/0/0
ObjectTemplate.intensity CRD_UNIFORM/30/20/0
ObjectTemplate.IntensityAtSpeed 10
ObjectTemplate.relativePositionInDof CRD_NONE/-2/0/0
ObjectTemplate.relativePositionInUp CRD_UNIFORM/0/1/0
ObjectTemplate.positionalSpeedInUp CRD_UNIFORM/4/0/0
ObjectTemplate.positionalSpeedInRight CRD_NONE/4/0/1
ObjectTemplate.rotationalSpeedInDof CRD_NONE/0/0/0
ObjectTemplate.rotationalSpeedInUp CRD_NONE/0/0/0
ObjectTemplate.rotationalSpeedInRight CRD_NONE/0/0/0
ObjectTemplate.startRotation CRD_UNIFORM/20/-20/0
ObjectTemplate.moveToWaterSurface 1
rem *** Fx_WaterFrontBigMesh ***
ObjectTemplate.create Particle Fx_JetWaterFrontBigMesh
ObjectTemplate.geometry watermesh_m1
ObjectTemplate.timeToLive CRD_NONE/3.2/0/0
ObjectTemplate.size CRD_UNIFORM/1/2/0
ObjectTemplate.gravityModifier CRD_UNIFORM/1/0.9/0
ObjectTemplate.sizeModifier 4/2/5
ObjectTemplate.sizeOverTime 0/1.10009|100/2.40004
rem *** Em_WaterFoam ***
ObjectTemplate.create Emitter Em_JetWaterFoam
ObjectTemplate.template Fx_JetWaterFoam
ObjectTemplate.looping 1
ObjectTemplate.startAtCreation 1
ObjectTemplate.addEmitterSpeed 1
ObjectTemplate.emitterSpeedScale 1
ObjectTemplate.lodDistance 600
ObjectTemplate.timeToLive CRD_NONE/0.1/0/0
ObjectTemplate.intensity CRD_UNIFORM/11/15/0
ObjectTemplate.IntensityAtSpeed 10
ObjectTemplate.relativePositionInUp CRD_UNIFORM/2/1/0
ObjectTemplate.relativePositionInRight CRD_NONE/1.5/0/0
ObjectTemplate.positionalSpeedInDof CRD_NONE/10/0/0
ObjectTemplate.positionalSpeedInUp CRD_UNIFORM/1/0/0
ObjectTemplate.positionalSpeedInRight CRD_NONE/2/0/0
ObjectTemplate.rotationalSpeedInDof CRD_NONE/0/0/0
ObjectTemplate.rotationalSpeedInUp CRD_NONE/0/0/0
ObjectTemplate.rotationalSpeedInRight CRD_NONE/0/0/0
ObjectTemplate.startRotation CRD_UNIFORM/-20/0/0
rem *** Fx_WaterFoam ***
ObjectTemplate.create SpriteParticle Fx_JetWaterFoam
ObjectTemplate.timeToLive CRD_NONE/1/1/0
ObjectTemplate.sizeOverTime 0/7.6e-005|100/5
ObjectTemplate.texture water_ono_I
ObjectTemplate.initRotation CRD_NONE/1/0/0
ObjectTemplate.XYSizeRatio CRD_NONE/0.5/0/0
ObjectTemplate.destBlendMode BMInvSourceAlpha
ObjectTemplate.XYSizeRatioOverTime 0/1|100/1.39995
ObjectTemplate.moveToWaterSurface 1
rem *** Em_WaterFoamR ***
ObjectTemplate.create Emitter Em_JetWaterFoamR
ObjectTemplate.template Fx_JetWaterFoamR
ObjectTemplate.looping 1
ObjectTemplate.startAtCreation 1
ObjectTemplate.addEmitterSpeed 1
ObjectTemplate.emitterSpeedScale 1
ObjectTemplate.lodDistance 600
ObjectTemplate.timeToLive CRD_NONE/0.1/0/0
ObjectTemplate.intensity CRD_UNIFORM/11/15/0
ObjectTemplate.IntensityAtSpeed 10
ObjectTemplate.relativePositionInUp CRD_UNIFORM/2/1/0
ObjectTemplate.relativePositionInRight CRD_NONE/-1.5/0/0
ObjectTemplate.positionalSpeedInDof CRD_NONE/10/0/0
ObjectTemplate.positionalSpeedInUp CRD_UNIFORM/1/0/0
ObjectTemplate.positionalSpeedInRight CRD_NONE/-2/0/0
ObjectTemplate.rotationalSpeedInDof CRD_NONE/0/0/0
ObjectTemplate.rotationalSpeedInUp CRD_NONE/0/0/0
ObjectTemplate.rotationalSpeedInRight CRD_NONE/0/0/0
ObjectTemplate.startRotation CRD_UNIFORM/-20/0/0
rem *** Fx_WaterFoamR ***
ObjectTemplate.create SpriteParticle Fx_JetWaterFoamR
ObjectTemplate.timeToLive CRD_NONE/1/1/0
ObjectTemplate.sizeOverTime 0/7.6e-005|100/5
ObjectTemplate.texture water_ono_I
ObjectTemplate.initRotation CRD_NONE/1/0/0
ObjectTemplate.XYSizeRatio CRD_NONE/0.4/0/0
ObjectTemplate.destBlendMode BMInvSourceAlpha
ObjectTemplate.XYSizeRatioOverTime 0/1|100/1.39995
ObjectTemplate.moveToWaterSurface 1
rem *** e_waterbackBig ***
ObjectTemplate.create EffectBundle e_JetwaterBig
ObjectTemplate.saveInSeparateFile 1
ObjectTemplate.timeToLive CRD_NONE/-1/0/0
rem -------------------------------------
ObjectTemplate.addTemplate Em_JetwaterbackBigStreak
ObjectTemplate.setRotation 90/0/0
rem -------------------------------------
ObjectTemplate.minDistanceUnderwaterSurface 0
ObjectTemplate.maxDistanceUnderwaterSurface 90
rem *** Em_WaterBackBigStreak ***
ObjectTemplate.create Emitter Em_JetWaterBackBigStreak
ObjectTemplate.template Fx_JetWaterBackBigStreak
ObjectTemplate.looping 1
ObjectTemplate.startAtCreation 1
ObjectTemplate.addEmitterSpeed 1
ObjectTemplate.emitterSpeedScale 1
ObjectTemplate.lodDistance 800
ObjectTemplate.timeToLive CRD_NONE/0.1/0/0
ObjectTemplate.intensity CRD_UNIFORM/10/14/0
ObjectTemplate.IntensityAtSpeed 15
ObjectTemplate.relativePositionInDof CRD_NONE/0.1/0/0
ObjectTemplate.relativePositionInUp CRD_NONE/-2/0/0
ObjectTemplate.relativePositionInRight CRD_UNIFORM/0/-10/0
ObjectTemplate.positionalSpeedInRight CRD_NONE/2/0/0
ObjectTemplate.startRotation CRD_NONE/1/0/0
ObjectTemplate.moveToWaterSurface 1
rem *** Fx_WaterBackBigStreak ***
ObjectTemplate.create Particle Fx_JetWaterBackBigStreak
ObjectTemplate.geometry watermesh_streak1_m1
ObjectTemplate.timeToLive CRD_NONE/3/1/0
ObjectTemplate.size CRD_NONE/10/15/0
ObjectTemplate.gravityModifier CRD_NONE/0/0/0
ObjectTemplate.sizeModifier 10/3/3
ObjectTemplate.sizeOverTime 0/0.100024|100/1
ObjectTemplate.gravityModifierOverTime 0/0.5|86/0.530015|100/1
ObjectTemplate.alphaOverTime 0/6.1e-005|9/0.53|100/0
To see this effect in action, watch this movie.
http://www.youtube.com/watch?v=cODS4gLqgEA