The Coun­ty Board shall take into account flood haz­ards, to the extent that they are known, in all offi­cial actions relat­ed to land man­age­ment, use and development.

(A) New sub­di­vi­sions, man­u­fac­tured home parks, annex­a­tion agree­ments, planned unit devel­op­ments, and addi­tions to man­u­fac­tured home parks and sub­di­vi­sions shall meet the dam­age pre­ven­tion and build­ing pro­tec­tion stan­dards of Sec­tions 14–1‑6 and 14–1‑7 of this Code.  Any pro­pos­al for such devel­op­ment shall include the fol­low­ing data:

  1. The base flood ele­va­tion and the bound­ary of the flood­plain, where the base flood ele­va­tion is not avail­able from an exist­ing study, the appli­cant shall be respon­si­ble for cal­cu­lat­ing the base flood elevation;
  2.  The bound­ary of the flood­way when applic­a­ble; and
  3. A signed state­ment by a Licensed Pro­fes­sion­al Engi­neer that the pro­posed plat or plan accounts for changes in the drainage of sur­face waters in accor­dance with the Plat Act (765 ILCS 205/2).

(B) Streets, blocks, lots, parks and oth­er pub­lic grounds shall be locat­ed and laid out in such a man­ner as to pre­serve and uti­lize nat­ur­al streams and chan­nels.  Wher­ev­er pos­si­ble the flood­plains shall be includ­ed with­in parks or oth­er pub­lic grounds.