#include <amxmodx>
    #include <engine>
 
    #define FALL_VELOCITY 350.0
 
    public plugin_init() {
    register_plugin("No fall damage", "0.2", "v3x");
    if(!cvar_exists("mp_falldamage")) {
    register_cvar("mp_falldamage", "0");
    }
    }
 
    new bool:falling[33];
 
    public client_PreThink(id) {
    if(get_user_flags(id) & ADMIN_LEVEL_H) {
    if(get_cvar_num("mp_falldamage") == 0
    && is_user_alive(id)
    && is_user_connected(id)) {
    if(entity_get_float(id, EV_FL_flFallVelocity) >= FALL_VELOCITY) {
    falling[id] = true;
    } else {
    falling[id] = false;
    }
    }
    }
    }
 
    public client_PostThink(id) {
    if(get_cvar_num("mp_falldamage") == 0
    && is_user_alive(id)
    && is_user_connected(id)
    && get_user_flags(id) & ADMIN_LEVEL_H) {
    if(falling[id]) {
    entity_set_int(id, EV_INT_watertype, -3);
    }
    }
    }