1. 單體建筑中水宜采用原水污、廢分流，中水專供的完全分流系統 完(wan)全(quan)分(fen)流系統(tong)(tong)是(shi)指中(zhong)水(shui)原水(shui)的收集(ji)系統(tong)(tong)和建(jian)筑的其他排(pai)水(shui)系統(tong)(tong)是(shi)完(wan)全(quan)分(fen)開的，即(ji)排(pai)水(shui)系統(tong)(tong)采用污(wu)廢分(fen)流形式，而建(jian)筑的生活給水(shui)與中(zhong)水(shui)供水(shui)也(ye)是(shi)完(wan)全(quan)分(fen)開的系統(tong)(tong)，也(ye)就是(shi)通常所說的“雙下水(shui)、雙上水(shui)”。 完全(quan)分流系(xi)統具有以下特(te)點： (1) 水(shui)量易千平衡。一般情(qing)況，有洗浴設備的建筑的優(you)質(zhi)雜(za)排水(shui)或雜(za)排水(shui)的水(shui)量，經(jing)處理后可(ke)滿足沖廁(ce)等雜(za)用水(shui)水(shui)量要求。 (2) 處(chu)(chu)理流程可(ke)以簡化(hua)。由于原水(shui)水(shui)質較(jiao)好，可(ke)減輕中(zhong)水(shui)處(chu)(chu)理系統的(de)負(fu)荷，減少占(zhan)地面積，降低造價(jia)。 (3) 減(jian)少污泥處理困難以及產生臭(chou)氣對建筑環(huan)境的影響。 (4) 中水處理系統容(rong)易實現設備化，管理方便。 (5) 中水用戶容易接受。
2. 建筑小區中水可采用下列系統形式： (1) 完(wan)全分流(liu)系(xi)統 全(quan)(quan)部(bu)(bu)完全(quan)(quan)分(fen)流(liu)系統(tong)是(shi)指(zhi)原水(shui)(shui)分(fen)流(liu)管(guan)系和(he)中水(shui)(shui)供(gong)水(shui)(shui)管(guan)系覆蓋全(quan)(quan)區所有建(jian)筑物(wu)的系統(tong)，即建(jian)筑小區內全(quan)(quan)部(bu)(bu)采用兩套排水(shui)(shui)管(guan)和(he)兩套供(gong)水(shui)(shui)管(guan)的系統(tong)。該(gai)種(zhong)系統(tong)形式管(guan)線(xian)比(bi)較(jiao)復雜，設計施工難度較(jiao)大，管(guan)線(xian)投(tou)資較(jiao)高，但具有水(shui)(shui)量易于(yu)平(ping)衡(heng)、處(chu)理流(liu)程簡化、用戶容易接受(shou)等優點。這種(zhong)形式可用于(yu)水(shui)(shui)價較(jiao)高的地(di)區，尤(you)其用在中水(shui)(shui)建(jian)設處(chu)千起步(bu)階段的地(di)區。 (2) 半完全分流系統(tong) 半完(wan)全分流(liu)(liu)系(xi)統(tong)(tong)就(jiu)是無原(yuan)水(shui)(shui)(shui)(shui)(shui)分流(liu)(liu)管(guan)系(xi)（原(yuan)水(shui)(shui)(shui)(shui)(shui)為(wei)綜合(he)污(wu)水(shui)(shui)(shui)(shui)(shui)或外接(jie)水(shui)(shui)(shui)(shui)(shui)源），只有(you)中水(shui)(shui)(shui)(shui)(shui)供水(shui)(shui)(shui)(shui)(shui)系(xi)或只有(you)污(wu)廢水(shui)(shui)(shui)(shui)(shui)分流(liu)(liu)管(guan)系(xi)而無中水(shui)(shui)(shui)(shui)(shui)供水(shui)(shui)(shui)(shui)(shui)管(guan)，處理后(hou)用于河道景觀、綠化等室(shi)外雜用的(de)系(xi)統(tong)(tong)，也就(jiu)是通(tong)常(chang)所說的(de)“單下(xia)水(shui)(shui)(shui)(shui)(shui)、雙(shuang)上水(shui)(shui)(shui)(shui)(shui)”或“雙(shuang)下(xia)水(shui)(shui)(shui)(shui)(shui)、單上水(shui)(shui)(shui)(shui)(shui)”。 該種系統(tong)形(xing)式管線(xian)比較(jiao)簡(jian)單，設計(ji)施工難(nan)度(du)較(jiao)小，管線(xian)投資較(jiao)少，可用(yong)于大多數工程。 (3) 無分流(liu)簡化系統 尤分流簡(jian)化系(xi)統是指建(jian)(jian)筑(zhu)(zhu)物內(nei)尤污(wu)廢水(shui)(shui)(shui)分流管系(xi)和中(zhong)(zhong)水(shui)(shui)(shui)供水(shui)(shui)(shui)管系(xi)的系(xi)統。該種系(xi)統形(xing)式(shi)的中(zhong)(zhong)水(shui)(shui)(shui)不(bu)進入建(jian)(jian)筑(zhu)(zhu)物內(nei)，中(zhong)(zhong)水(shui)(shui)(shui)只用(yong)(yong)在小(xiao)區綠化、澆(jiao)灑(sa)道路、水(shui)(shui)(shui)景觀和人工河湖補水(shui)(shui)(shui)、地下車(che)庫地面沖(chong)洗(xi)(xi)和汽(qi)車(che)清洗(xi)(xi)等用(yong)(yong)途，中(zhong)(zhong)水(shui)(shui)(shui)原水(shui)(shui)(shui)采用(yong)(yong)生活污(wu)水(shui)(shui)(shui)或是外接水(shui)(shui)(shui)源。這種系(xi)統形(xing)式(shi)建(jian)(jian)筑(zhu)(zhu)物內(nei)部(bu)管路設計簡(jian)單，管線投資(zi)比較低，適(shi)用(yong)(yong)于已建(jian)(jian)小(xiao)區的增(zeng)建(jian)(jian)中(zhong)(zhong)水(shui)(shui)(shui)工程(cheng)。
3. 系統形式的選擇 中水系統形式(shi)的(de)選擇，應根據工(gong)程的(de)實(shi)際情況、原水和中水用暈的(de)平衡(heng)和穩定、系統的(de)技術經(jing)濟合理性等因(yin)素綜合考慮確定。
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